Document XOmVomN6g5m2ZOo5rKYRnMYkB

2-8 GROUP 2 - BRAKES \flfcA Hetncjjry the control valve phmger forward. However, the unbalanced forces of atmospheric pressure and vacuum on each side of the diaphragm will con tinue to move the outer sleeve of the control valve plunger forward keeping the vacuum porting closed. At the same time, the reaction force acting through the reaction ring and lever assembly will tend to move the atmospheric valve to the closed po sition (Fig. 3). When these com bined forces balance, the porting to the vacuum supply will remain closed and the atmospheric valve will cut off any further passage of atmospheric pressure to the area be hind the diaphragm. Therefore, the power assist force acting on the master cylinder piston will stabilize and the hydraulic force applying the brakes will be maintained at a con stant level. RELEASED POSITION When the pedal pressure is re leased from the valve operating rod and plunger assembly, the plunger return spring moves the plunger away from the atmospheric valve allowing the valve to seat against the hub (Fig. 4). This seating of the valve closes off the bellows chamber from the hub porting that connects to the rear side of the diaphragm. At the same time, the rearward movement of the plunger opens the porting horn the vacuum chamber and draws out 'the air from the reat side of the power diaphragm. With vacuum on both sides of the. dia phragm, the assist force against the master cylinder push rod is elimin ated. The brake shoe retracting springs will, therefore, cause the hy draulic fluid to return the master cylinder piston, push rod, control valve plunger assembly and the dia phragm to the released position. With the piston and push rod. in the released position, the hydraulic compensating port in the master cylinder n open. The open port per mits fluid either to return from the brake system to the fluid reservoir,' or enter the brake system from the reservoir. PARKING BRAKE An independent foot-operated parking brake control actuates the rear wheel brake shoes through a cable linkage. The operating cable is routed from the parking brake control assembly to the equalizer lever which is attached to the equal izer assembly. The rear brake cables connect the equalizer assembly to the parking brake lever at each rear secondary shoe (Fig. 1). When the pedal is depressed the secondary brake shoes are forced against the rear brake drums. Hie pedal is held in the applied position by the engagement of a spring loaded pawl with a ratchet. Pushing down on the release handle disen gages the pawl from the ratchet to release the brakes. Q IN-CAR ADJUSTMENTS AND REPAIRS BRAKE SHOE ADJUSTMENTS The car should be raised with the wheels off the floor. If the ear is raised on a frame-contact hoist, dis connect the parking brake cables to prevent the rear brakes from being partially applied doe to rear axle and spring sag on the hoist. The hydraulic service brakes are self-adjusting and require a manual ' adjustment only after the bake shoes have been relined, replaced, or when die length of the adjusting screw has been changed while per forming some other service opera tion. The brake drums should be at normal room temperature when ad justing the brake shoes. If the shoes are adjusted when the drums are hot and expanded, the shoes may drag when the drums are cool and contracted. 1. After the shoes have been in stalled or the adjusting screw has been turned, install the drum. Be sure that all excess grease, oil, and other foreign material are wiped off the carrier plate and drum. Before installing the brake drum on the front wheel spindle, wipe the spindle completely. free of grease. Install the drum carefully so that the grease seal retainers within the hub will not be damaged. 2. Remove the adjusting hole cover from the carrier plate and, from the carrier plate side, turn the' adjusting screw upward to expand the shoes (Fig. 5). JSxpand the shoes Until a drag is felt when the drum is rotated. 3. Remove the drum. Mark the tooth on the star wheel where the lever contacts the adjusting screw. While holding the adjusting lever BtoItd Sho* Adjusting Tool HI 122-A FIG. 5--fx|pan<Rng Brake Shoes ------ - t ~- * I-G-vrrl r MerrOf'/ 8005 060$ HFM - 000207 SCF-FORD-0385 PART 2-2-BRAKE SYSTEM 2-9 out of engagement with the adjust 2. Insert a narrow screwdriver INSTALLATION ing screw, back off the adjusting screw 34 of a turn with the fingers. If finger movement will not turn the screw, free it up; otherwise, the self adjusting lever will not turn the screw. Lubricate the screw with a thin uniform coating of StanolUbe--. HD Mol/ Grease-Grade 2. Any other adjustment procedure may cause damage to the adjusting screw with consequent seif adjuster problems. 4. Apply a small quantity of high- through the brake adjusting hole at the inner side of the brake carrier plate, and disengage the adjusting lever from the adjusting screw. While holding the adjusting lever away from the screw, back off the adjusting screw with the brake ad justing tool (lug. 6). Be very careful not to burr, chip, or damage the notches In the adjusting Screw; otherwise the self-adjusting mech anism will not function properly. 3. Remove the grease cap from 1. Remove the protective coating from a new drum with carburetor degreaser. 2. Place the drum over the brake assembly and into position. Adjust the brakes as outlined under "Brake Shoe Adjustments" in this section. 3. Install the three Tinnerman nuts and tighten securely. Install the wheel on the axle shaft flange studs against the drum, and tighten the retaining nuts to specifications. temperature grease to the points where the shoes contact the carrier plate, being careful not to get the lubricant on the linings. Install the drum. the hub. Remove the cotter pin, nut lock, adjusting nut, and flat washer from the spindle. Remove the outer bearing cone and roller assembly. 4. Pull the hub and drum as BRAKE SHOES AND ADJUSTING SCREW . REMOVAL 1. With the wheel and drum re On a front wheel, install the wheel sembly of the wheel spindle. moved, install a clamp over the outer bearing, washer, and adjusting nut, then adjust the wheel bearings as outlined in Part 3-5, Section 2. On rear wheels, install the three Tinnerman nuts and tighten securely. 5. Install the wheel on the drum and tighten the mounting nuts to specification. 6. Install the adjusting hole cover on the brake carrier plate. 7. When adjusting the rear brake shoes, check the parking brake cables for proper adjustment Make sure that the equalizer lever oper ates freely. 8. After the brake shoes have been properly adjusted, check the operation of the brakes. FRONT BRAKE DRUM REMOVAL ' 1. Raise the car until the wheel ' and tire clear the floor. Remove the - wheel cover or hub cap, and remove the wheel and tire assembly from the drum. . ' INSTALLATION 1. If the drum is being replaced, remove the protective coating from the new drum with' carburetor de greaser. Install new bearings and grease retainer. Soak the new grease retainer in light engine oil at least 30 minutes before installation. Pack the wheel bearings, install the inner bearing cone and roller assembly in the inner cup, and install the new grease retainer. See Part 3-5, Sec tion 4. If the original drum is being in stalled, make sure that the grease in the hub is clean and adequate. 2. Install the drum assembly and adjust the brakes as outlined under "Brake Shoe Adjustments" in this section. ' 3. Install the outer wheel bearing, washer and adjusting nut. ' 4. Adjust the wheel bearing as outlined in Part 3-5, Section 2, then install the grease cap. Install the wheel and. hub cap. ** ends of the brake cylinder as shown in Fig. 7. . 2. Contract the shoes as follows: a. Disengage the adjusting lever from the adjusting screw by pulling backward on the adjusting lever (Fig. 1). b. Move the outboard side of the adjusting screw upward and back off the pivot nut as far as it will go. 3. Pull the adjusting lever, cable and automatic adjuster spring down and toward the rear to unhook the pivot hook from the large hole in the secondary shoe web. Do not at tempt to pry the pivot book out of the hole. - 4. Remove the automatic adjuster spring and adjusting lever (Fig. 1). 5. Remove the primary shoe to anchor spring with the tool shown in Fig. 7. With the same tool, re move the secondary shoe to anchor ' spring and unhook the cable eye from the anchor pin. , .6.- Remove the anchor pin plate. 7. Remove the cable guide-from REAR BRAKE DRUM - the secondary shoe (Fig. 1). ' \ ' 8. Remove the shoe hold-down REMOVAL springs, shoes, adjusting screw, pivot 1. Raise the car so that the wheel nut, aqd socket. v . .- ' is clear of the floor. ' ' 2. Remove the hub cap and Toot--2035-N or 2086-1 wheel. Remove the three Tinnerman nuts and remove^ the brake drum. -inserta narrow screwdriver through . the brake adjusting hole in the car rier plate,, and disengage the adjust - ing lever from the adjusting screw. . While holding the adjusting lever away from the adjusting screw, back off the adjusting screw with the brake adjusting tool (Fig 6). Be very careful not to burr, chip, or damage FIG, 6--Backing Off Brake . the* notches In the,adjusting .screw; * otherwise, the self-adjusting mech Adjustment anism will not function properly. . x.. V* > . .. > * . 'c. y-.. 8O03iO404 HFM - 000208 2-10 . GROUP 2-BRAKES Tool--JOJi-N or 2046-1 Tool--IM*I 19 H)l47-B FIG. 8--Retracting Spring; Installation ,. 9. On ' ..if brakes, remove the . ` parking brake j. k and spring. Dis connect the poking brake cable from the parking brake lever. s 10. After removing the rear brake secondary shoe, disassemble the * parking brake lever from the shoe by removing the retaining clip and . spring washer (Fig. 1). '. INSTALLATION. ' - 1. Before installing the rear brake shoes, assemble the parking brake . lever to the secondary shoe and secure with the spring washer and retaining clip. 2. Apply a light coating of hightemperature grease at the points where the brake shoes contact the carrier plate. 3. Position the brake shoes on the carrier plate and secure the assem bly with the hold down springs. On the rear brake, install the parking brake link and spring. Cqnnect the parking brake cable to the parking brake lever (Fig. 1). 4. Install the anchor pin plate on the anchor pin. 5. Place the cable eye over the anchor pin with the crimped side toward the carrier plate. 6. install the secondary shoe to anchor spring (Fig 8). 7. Install the cable guide on the secondary shoe web with the flanged hole fitted into the hole in the sec ondary shoe web. Thread the cable . around the cable guide groove (Fig 1). It b imperative that the cable be positioned in this groove and not between the guide and the shoe web. 8. Install the primary shoe to an chor spring with the tool shown in Fig 8. Be certain that the cable eye to not cocked or binding on the an chor pin when installed. All parts should be flat on the anchor pin. Remove the brake cylinder clamp. 9. Apply high-temperature grease to the threads and the socket end of . the adjusting screw. Turn the ad justing screw into the adjusting piv.ot nut to the limit of the threads- and' then back off V4 turn. . 1' Interchanging the brake shoe ad justing screw assemblies from one ride of the car to the other would cause the brake shoes to retract rather than expand each time the automatic adjusting mechanism op erated. To prevent installation on the wrong side of the car, the socket end of the adjusting screw is stamped with an R or L (Fig 9). The adjust ing pivot nuts can be distinguished by the number of grooves machined around the body of the nut Two grooves indicate a right hand nut; one groove indicates a left hand nut '"' 10. Place the adjusting socket on the screw- and install this assembly between the shoe eflds with the adr justing screw toothed wheel nearest the secondary shoe. * 11. Hook the cable hook into the hole in the adjusting lever. The ad justing levers are stamped with an R or L to indicate their installation on a right or left hand brake as sembly (Fig 9). 12. Position the hooked end of the adjuster spring completely into the large hole in the primary shoe web. The last coil of the spring should be at the edge of the hole. Connect the loop end of the spring to the adjuster lever hole. 13. Pull the adjuster lever, cable and automatic adjuster spring down and toward the rear to engage the pivot hook in the large hole in the secondary shoe web (Fig. 1). 14. After installation, check the action of the adjuster by pufling the section of the cable between the cable guide and tbe adjusting lever toward the secondary shoe Web far enough to lift the lever past a tooth on the adjusting screw wheeL The lever should snap into position be hind the next tooth, and release of the cable should cause the adjuster spring to return the lever to its orig inal position. This return action of the lever will turn the adjusting screw one tooth. If pulling the cable does not pro duce the action described, or if the lever action is sluggish instead of positive and sharp, check ihe posi tion of the lever on the adjusting screw toothed wheel. With die brake in a vertical position (anchor at the top), the lever should contact the adjusting wheel %e inch plus or minus inch) above the centerline of the screw. If the contact point is below this centerline, the lever will - not lock on the teeth in the adjust ing screw wheel, and the screw' will not be turned as the lever is actu- ated by the cable. To determine the 'cause of this ' - condition; a. Check the cable end fittings. ' ' The cable should completely fill or extend slightly beyond tbe crimped, ' , section of the fittings. If it docs not-!' -* -* meet this specification, possible dam-' age is indicated and the cable as- . sembly should be replaced. b. Check the cable length. The . . cable should measure 1114 inches ' (plus or minus Vn inch) from the end of the cable anchor to the end of the cable hook. ,. t c. Check the cable guide for dant- '. . .age. The cable groove should Ire . parallel to the shoe web, and the body of the guide should lie flat - against the web. Replace the guide if it shows damage. . ,. d. Check the pivot hook on the lever. The hook surfaces should be square with tbe body of the lever ' for proper pivoting. Replace the , lever if the hook shows damage. e. See that the adjusting screw socket is properly seated in the notch in the shoe web. WHEEL CYLINDER REPAIR It is not necessary to remove the brake cylinder from the carrier plate to disassemble, inspect, or hone and overhaul the cylinder. Removal h necessary only when the cylinder is . damaged or scored beyond -repair. DISASSEMBLY 1. Remove the links and the rub ber boots from the ends of the brake cylinder. Remove the pistons, cups, and return spring from the cylinder bore (Fig. 10). FIG. 9--Adjusting Screw and lever Identification HFM - 000209 i 8003 0605 i BOOT BOOT line to remove any foreign matfer before making connections. 1. To install a front cylinder: FRONT MAM CYLINDER BIEEDER SCREW RIAft BIAKI CYUNMl FIG. 10--Front and Roar Wheel Cylinders CUP H110O-A' 2. Remove the bleeder screw 3. Remove the brake shoe assem- from the cylinder. - blies, following procedures outlined INSPECTION . 1. Wash all parts in clean de natured alcohol. If alcohol is not available, use specified brake fluid. Dry with compressed air. 2. Check all internal parts for excessive wear or damage. If any of the Internal parts require replacing, all should be replaced. ' 3. Inspect the cylinder bore for score marks or rust. If either con dition is present, the cylinder bore must be honed. However, the cylfn* der should not be honed more than 9.003 Inch beyond Its original di ameter. 4. Check the bleeder hole to be . sure that it is open. ; In this section. 4. Disconnect the brake line from the brake cylinder. On a car with a vacuum brake booster, be sure the engine is stopped and there is no vacuum in the booster system be fore disconnecting the hydraulic lines. To disconnect the hose at a front cylinder, loosen the tube fitting that connects the opposite end of the hose to the brake tube at a bracket on the frame. Remove the horse shoe-type retaining clip from the hose and bracket, disengage the hose from the bracket, then un screw the entire hose assembly from the front wheel cylinder..'. " At a rear cylinder, unscrew the .ASSEMBLY ' . ' ` , .. tube fining that connects the tube ' 1. -Apply a coating of heavy-duty to the cylinder.-Do not pull die metal * brake fluid to all internal parts.- . tube away from the cylinder. Pull 2. Threqd the bleeder screw Into ing the tube out of the cylinder con . ` the cylinder and tighten securely. nection will bend the metal tube and 3. Insert, the return spring, cups, make installation difficult. The tube - and pistons'Into, their respective po will separate from the cylinder when sitions in the cylinder bore (Fig. the cylinder is .removed from the Ip). Place a boot over each end of carrier plate. .- the cylinder. Bleed the brake system. . 5.' On the rear wheel, remove the , wheel .cylinder retaining bolts and * WHEEL CYLINDER " ` `. 'lock 'Washers* and remove the cylin REPLACEMENT REMOVAL . . .' ` . 1. With the wheel in a raised po- ' - sition, remove the wheel and the , drum. ` - 2. Place .'a clamp over the ends of the brake cylinder as shown in der. Op the front wheel, remove the nuf and washer that retains the eyl- inder to the anchor pin. * Remove the cylinder from the anchor pin, and remove the clamp from the cyl inder. . .; INSTALLATION .- * . {fig. 7, '. / . ' . - - . . \ * .; - Wipe the end(s) of- the hydraulic a. Position the cylinder on the anchor pin against the carrier plate. Install the washer and cylinder retain ing nut on the anchor pin, and torque to specification. b. Install a new copper gasket over the hose fitting. Screw the hose as sembly into the cylinder. c. Engage the opposite end of the hose to the bracket on the frame, in stall the horseshoe-type retaining clip, and connect the brake tube to the hose with the tube fitting nut Tighten the nut to specification with tool 1112-144. , 2. To install a rear cylinder: a. Place the rear wheel cylinder into position. Enter the tubing into the cylinder, and start the tube fitting nut into the threads of the cylinder. b. Secure the cylinder to the car rier plate by installing the retaining bolts and lockwashers. c. .Tighten the tube fitting nut to specification with tool 1112-144. 3. Install the links in the ends of the wheel cylinder, install the shoe and adjuster assemblies, and adjust the shoes as outlined in this section. 4. Install the brake drum and wheel, adjust the brakes (Part 2-2, ' Section 2), and bleed the brakes as outlined in Part 2-1, Section 2. - BRAKE CARRIER PLATE REPLACEMENT . REMOVAL . ' .* . " 1. Remove the* wheel and brake drum. Disconnect the - brake line from the brake cylinder. . *. - 2. Remove the brake shoe- and adjuster assemblies and the wheel cylinder as outlined in this section. On the rear wheels, disconnect the. parking brake lever from the cable. 3. If the rear carrier plate is be ing replaced, rotate the axle Shaft - so that the hole in the axle shaft ../.flange fines-upwith the. cpxxier.plate'. retaining 'nuts and remove the nuts.. Pull the axle shaft assembly out of the housing with tool-4235C and a slide hammer (Part 4-2), then re move the carrier plate. If the front carrier plate is being replaced, remove the bolts.and nuts .that.secure the plate to the front wheel spindle and remove flie plate. HFM- 000210 -86634 I` . S ' - i* iL ill 'il I i.l `\ !' ;.i `i GROUP 2-BRAKES control assembly to the dash side - panel and secure with the retaining bolts. ' 5. Raise the car on a hoist. Route the cable over the frame side rail and through the cross member. 6. Secure the cable housing to the frame side rail by installing two re taining clips, one on each side of the side rail. Position the cable assem bly so that the tape marker is lo cated at the in-board clip. 7. Secure the cable housing to the rear side of the transmission - rear support cross member by installing the hairpin retainer (Fig. 17). Install the spring seat and cable spring on the cable. 8. Assemble the rear end of the cable to the equalizer lever, and in stall the half moon-type adjusting nut on the .end of the cable. 9. Adjust the parking brake link age as outlined in Part 2-1, Section 2, and check the operation. PARKING BRAKE EQUALIZER TO REAR WHEEL CABLE REMOVAL - . 1. Raise the car and remove the hub cap and wheel. - 2. Remove the three Unnerman nuts that hold the brake drum in place, back off the brake shoes, and remove the drum. 3. Loosen the lock nut on the equalizer rod, and disconnect the cable from the equalizer (Fig. 2, Part 2-1). 4. Remove the hair pin retainer that holds the cable housing to the frame bracket and pull the cable and housing out of the bracket (Fig. 17). 5. Working on the wheel side (Fig. 1), compress the prongs on the cable retainer so that they can pass through the hole in the carrier plate. Draw the cable retainer out of the hole. 6. With the spring tension off the parking brake lever, lift the cable out of the slot in the lever and re move through the carrier plate hole. Q MAJOR REPAIR OPERATIONS BRAKE DRUM REFINISHING Minor scores on a brake drum can be removed with a fine emery cloth. A drum that is excessively scored or shows a total indicator runout of over 0.007 inch should be turned down. Remove only enough stock to eliminate the scores and true up the drum. The reflnlshed diameter must not exceed 0.060 inch oversize (11.090 inches). If the drum diameter is less than 0.030 inch oversize (11.060 inches) after refinishing, standard lining Olay be installed. If the drum diame ter is 11.060-11.090 inches, oversize linings must be installed. After a drum is turned down, wipe the relinished surface with a cloth soaked in dean denatured al cohol If one drum is turned down, the opposite drum on the same axle should also be cut down to the same size. BRAKE SHOE RELINING Brake linings that are wbrn to within hia inch of the rivet or have been saturated with grease or oil should be replaced. Failure to re place worn linings will result in a scored drum. When it'Is necessary to replace linings, they must also be replaced bn the wheel on the oppo site of the car. Inspect brake shoes for distortion, cracks, or looseness. If this condi tion exists, the shoe should be dis' carded. Do not repair a defective brake shoe. 1. Wash the brake shoes thor oughly in a clean solvent Remove all burrs or rough spots from the shoes. 2. Check the' inside diameter of the brake dram. If the diameter is less than 11.060 inches, standard lin ing may be installed. If the diameter is 11.060-11.090 inches, oversize lining should be installed. 3. Position the new lining on the .shoe. Starting in the center, insert and secure the rivets, working alter nately towards each end. Install all parts supplied in the kit. Replace ment linings are ground and no further grinding is required. 4. Check the clearance between the shoe and lining. The lining must seat tightly against the shoe with not more than 0.005-inch clearance be tween any two rivets. MASTER CYLINDER DISASSEMBLY 1.' Clean the outside of the cylin der, and remove the filler .cap and gasket. Pour out any brake fluid that may remain ifl the cylinder or res ervoir. 2. Remove the stop light switch and the brake line fitting from the INSTALLATION t . 1. Pull enough of the cable ' through the housing so that the end. of the cable may be inserted over-- the slot in the parking brake lever (Fig. 1). 2. Pulling the excess slack from, the cable, insert the cable housing' into the carrier plate access hole so that the retainer prongs expand. 3. Thread the front end of the cable housing through the frame bracket and install the hair pin re tainer (Fig. 17). - ' 4. Insert the ball end of the cable into the equalizer and tighten die . lock nut on the equalizer end slight ly (Fig. 2, Part 2-1). . 5. Install the rear drum. Tighten the three Tinnerman nuts that retain the drum, and install the wheel and hub cap. 6. Adjust the rear brake shoes as oudined in Section 2. Adjust the parking brake linkage as outlined in Part 2-1, Section 2. forward end of the cylinder (Figs. 18 and 19). , 3. Remove the snap ring from the bore at the rear of the cylinder with tool 33621 (Fig. 20). 4. When disassembling a master cylinder used with the standard brake system, remove the piston as sembly, cup, spring, check valve, and valve seat from the cylinder bore (Fig. 18). When disassembling a master cyl inder used with a booster, remove the piston assembly, cup, and the spring and check valve assembly from the cylinder bore. Remove the O-ring from the piston (lug. 19). CLEANING, INSPECTION, AND REPAIR L dean all master cylinder parts in clean denatured alcohol, and in spect the parts for wear or damage, replacing them as required. When using a master cylinder repair bit, install all of the parts supplied. 2. Check the ports and vents in the master cylinder to make sure that all are open and free of foreign matter. . 3. A leaf-type valve is riveted to the front end of the piston in a master cylinder used with the stand ard brake system (Fig. 18). If this valve is loose or has moved so that the piston ports are open, replace the. piston. . HFM -000211 PART 2-2 -- BRAKE SYSTEM 2-1/ FIG. 20--Removing Snap Ring ' from Master Cylinder . FIG. 18-Master Cyfimler with Standard Brake System When inspecting a master cylin der used with a toaster, check the ports in the pfeton to make sure that they are open and free of for eign material (Fig. 19). 4. Inspect the cylinder walls for scores or rust, and recondition them if necessary. Hone die cylinder walls no more than necessary (0.003 Inch maximum). Oversize pistons and cups are not available for excessively honed cylinders. 5. Remove any bum or loose metal that may have resulted from the honing operation, and clean the cylinder with denatured alcohol. ASSEMBLY 1. Dip all parts except the master cylinder body in clean FoMoCo heavy-duty brake fluid. 2. Install the brake line fitting and the stop light switch on the cyl inder and tighten them securely. 3. When assembling a master cyl inder used with the standard brake system, install the valve seat, check valve, spring, cup, and piston assem bly in the cylinder bore (Fig. 18). When assembling a master cylin der used with a booster, install the O-ring on the piston. Install the spring and check valve assembly, ' cup, and piston in the cylinder bore (Fig. 19). . 4. Install the snap ring in the bade of the bore (Fig. 20). DISASSEMBLY OF BOOSTER REMOVAL OF EXTERNAL PARTS 1. Remove the two attaching nuts and lockwashers, and separate the master cylinder from the booster body. 2. Remove the filter, cover and FIG. 19-Moster Cylinder with Booster hub and the air filter from the boost er body (Fig. 6, Part 2-1). 3. Remove the vacuum manifold and check valve assembly and the rubber grommet from the booster body (Fig. 6, Part 2-1). 4. Disconnect the valve operating rod from the lever assembly by re moving the retainer clip and con necting pin (Fig. 6, Part 2-1). 5. Disconnect the lever assembly from the end plate brackets by -re moving the retainer clip and pivot pin. 6. Remove the retaining huts, and disassemble the brackets from the end plate. 7. Remove the rubber boot from the valve operating rod. SEPARATION OF MAJOR COMPONENTS L Remove the large C-ring that retains the rear seal adapter assem bly to the booster end plate (Fig. 6, Part 2-1). 2. Scribe a line across the booster body and end plate to facilitate proper alignment at reassembly. Re move the booster body-to-end plate retaining screws, tap'the outside of the end plate with a fibre hammer, . and separate the end plate from the - booster body, leaving the rear seal * and adapter assembly on the control. valve hub. , . 3. Push the bellows assembly'into the vacuum chamber (Fig. 21), and separate the bellows, control valve, and diaphragm assembly from the ` booster body. : 4. Remove the outer O-ring from the rear seal adapter assembly (Fig.- 6, Part 2-1). .. ... ' .. DISASSEMBLY OF BELLOWS, ' PUSH ROD AND- VALVE ASSEMBLY FROM DIAPHRAGM ' 1. .Remove the large bellows re taining ring, bellows,, bellows retain er and. .'support ring ..from the dia phragm and valve assembly (Fig. 22). 2.* Remove the retainer 'and sup- ' port ring from the bellows (Fig. 6, - Part 2-1). ' HFM -000212 $0030608