Document DD9nJa4bp79zqxZyVVBbdvOnQ

38 anchor. Depending upon the direction of drum rotation, either the primary or secondary shoe is free to move away from the anchor when the brake is ap plied. The anchor is a self-centering type, permitting inward or outward shoe movement to center the shoes in accordance with drum surface pressures exerted on the lining. Opposite the anchor, brake shoes are linked by means of a floating star wheel adjuster and a single retracting spring hooked be tween the shoe webs so that it engages and locks the adjuster star wheel. The star wheel adjuster link is used to ex pand the shoes into the drum, thus adjusting the lining clearance. It also transmits the actuating force from one shoe to the other. This servo action causes the shoes to function as a single unit in which the total braking force developed on one shoe is compounded in the action of the second shoe. Series CF brakes are provided with a single end wheel cylinder and self-energi zation and servo action occurs only dur ing forward movement of the vehicle. This brake has reduced effectiveness when the vehicle is backing, conse quently is used only on the front axle. Series CFR and CFRE brakes are equipped with standard double-end straight-bore wheel cylinder. ASSEMBLY Shoe pads on backing plate must be clean, smooth and free from rust. Dress rough spots and burrs with a file, other wise shoes may tend to "hang" and un balance the braking effort. Paint pads with a thin coat of Lubriplate or equiva lent before installing shoes. CAUTION: ARROW STAMPED ON THE AN CHOR BLOCK (indicating the convex anchor surface) INDICATES PROP ER DIRECTION OF ASSEMBLY. ARROW MUST FACE IN FOR WARD DIRECTION OF DRUM ROTATION (usually toward front of vehicle) SO THAT CONVEX AN CHOR SURFACE OF BLOCK FACES THE PRIMARY SHOE TOE AND FLAT ANCHOR SURFACE FACES THE SECONDARY SHOE TOE. ANCMO* BtOCX- ADJUSTMENT 1. Set parking brake pedal or lever in first notch. Series CFRE brakes, used on rear axles, incorporate a cable-operated parking brake working independently of the hydraulic service brake, but utiliz ing the same brake shoes. Shoes are ex panded by a toggle lever, pinned to the rear (secondary) shoe, and a link, sus pended between this lever and the op posite shoe. The cable, operated through an equalizer, passes through the backing plate and is connected to the free end of the lever. On CFRE brake, parking brake lever is installed between the backing plate and shoe web, on 10" or larger drum diameters. 2. Tighten star wheel adjuster until adjustment feels solid with linings tight against drum. 3. Back off star wheel by rotating star wheel at least eight notches in the opposite direction. With new lining in stalled, back off at least ten notches. 4. Adjust parking brake,'with lever or pedal in first notch, adjust cable length to remove slack. Apply parking brake to check travel and then release brake to make sure that sufficient slack remains in cable so that brakes will not drag. Lubricate cable and pivot pins.