Document JNyVZm1X7J9BX1VE1y711wzk6

MULTI BE.ST O 5, HANDBOOK FOR BRAKE .SERVICE BEND/X HYDRAULIC DUO SERVO BRAKE fS/irjl* PIsfoa! I HIS brake Is net oa the 1934 models of OMamobile and 1934-45 la 8alia. It differ* from the Bsadix Hydraulic Duo Servo brake doable pistoa type la rber it ha* but a tingle piaton in the hydraulic wheel cylinder. The whfpl cylinder Boats with respect to the backing plate, yet b anchored to the secondly shoe and actuates that shoe while the piston moves the primary w :f The Duo Servo action is still maintained, since the primary rfioe is conaected to the secondary shoe by a star gear assembly. The rear service brakes act as , parking brakes and when used as such are mechanically controlled by separate cable control. Details of this control are thown in the above (ketch. The clearance* of the secondary shoe should be .010' *t all points. A .002' variance is allowable, but if the clearances at ends of secondary shoe differ more than th:s the anchor should be reset to assure good brake performance. No definite clearances are recommended on the primary shoe--if the secondary shoe clearance b correct and adjustment instructions are carefully followed, the clearances between the primary shoe lining and drum will take care of themselves,. See Pago Iff for definition of Primary Shoo. ". 14 V*". . ` "vr: MULTIBESTOS HANDBOOK FOR BRAKE SERVICE Minor Adjustment " from anchor. Correct adjustment is 1. Remove inspection covers from brake dram*. 2. Loosen eccentric lock nut and insert .010' feeler gauge between lining of secondary shoe and brake drum. impossible, and shoe will slao against anchor going backwards or forwards* with resulting clicking sound* 7. Replace all covers. Mo/or Adjustment. 3. Turn eccentric (A) in direction of 1. Remove parking brake cables at cross forward wheel rotation until .010" shaft. feeler gauge is snug at adjusting 2. Loosen anchor nin nut by backing points of secondary shoe. Tighten off half turn on anchor pin lock nut. eccentric lock nut. 3. Expand s^ncs by turning itar gear 4. Expand brake shoes by turning star * until the two sfioeS are expanded gear (turning star wheel down and sufficiently to cause enough drag so toward brake drum expands the shoes *haf the wheels can just be turned --eee Fig. 4. Page ll) until light with both hands. Using a soft ham- dreg it felt on the brake drum. 11 mer, strike the anchor pin on the 5. Turn star gear in opposite direction threaded end to make sure it : free until drum is free from drag. * and that it moves to correct position. 6. Check emergency brake cables for Ij M;kc this adjustment on all four any excess play and adjust if neces- wheels. ary. (With parking brake lever re 4. Tighten anchor pin (C) using 1G- leased and against stop, pull brake inch wrench. cable until strut rod inside rear brake 5. Release shoes by turning star gear cam can be felt making contact with l! until wheels are free from drag. brake shoe. Holding cable in this po *1 6. Proceed with shoe adjustment out* sition, td/utt clevis on cable so that i fined under "Minor Adjustment." clevis pin can just enter brake cross 7. Replace parking brake cables uing shaft lever.) If parking brake cable is i adjustment as explained in "Minor too short shoes will be expanded away i. Adjustment." Average time required for a complete four wheel refine 4Vi to SV fcoor*. Maintenance Suggestions It pedal is dose to floor board or has I1 Do not attempt to salvage used brake springy action, then look for I fluid. (a) Normal lining wear. (Minor adjust ment.) ji !' !l Do not attempt to use minersl oil In Tines. (Use nothing but genuine Hydraulie fluid.) (b) Leak in system. (Tighten connec . (a) If mineral oil has been used in tions or replace worn parts where lines, replace all rubber parts and leak la found.) | flush lines with alcohol. (Refill with (c) Alt in system. (Bleed lines.) Hydraulic fluid.) <d) No fluid in supply tank. (Refill and Drums should not be turned any thin- blsed lines.) ' ner than .357". (#) If brakes drag or do not release. (Check port hole in master cylinder and adjust pedal clearance, or look for mineral oil In lines.) li ! Occasionally cap screw* bolding wheel cylinder to secondary shoes become loosened, allowing cylinder to drop. Be sure to check for correct alignment. I Lubricate dust cover plate at place Do not attempt to wash any of rubber caps or parts with anything but clean I . alcohol. where hydraulic hose fitting passes through backing plate to ellow free movement of brake ehoe*. Soper-Effecffve Broke< Some 1934 and 1935 cars with hydraulic Bendix brake* dive to the left and right on brake application, due to the super-effectiveness of the brakes. Following are some suggested remedies: 1. Check clearances on alt Bhoes to insure equal balance of front wheels. 2. Check retracting springs {or stiffness. If they show signs of weakness, replace them with stiff er springs. 3. -Seduce clearance between drum and lining to reduce servo action. .V. 4. Rsduce effective area of primary shoe lining on front brakes by cutting off t second rivet holes or by a long tapering chamfer, or by grooving of primary shoe linings. Use Tower friction lining on primary shoes. 5. Watch for bent backing plate*. .If oversize linings are used to reduce clearances and serv action, be sure lined rrffjvT shoes are ground to correct diameter to avoid toe and bed contact. ,J|^ A'. In Cases of diving to one side check shock absorbers as possible source and equalize. ~ 9m': Check wheel alignment Too great or unequal caster may cause diving. 15