TM 5-3805-258-24-1A I R S Y S T E M A N D B R A K ESH Y D R A U L I C C I R C U I T F O R T HEW H E E L B R A K ESS Y S T E M S O P E R A T I O NWHEEL BRAKESFluid goes through passages between the boresof pistons (4). Fluid then goes between bores thatare opposite each other through a passage insidehead assembly (1).WHEEL BRAKE1. Head assembly. 2. Bleeder screw. 3. Piston saal. 4.Pistons(six).5. Friction linings (two). 6. Matalbackings(two). 7. Bolt (that holds anchor pln in placa). 8. Anchorpins (two). 9. D i s c .Fluid activated caliper/disc brakes are at allfour wheels. Head assembly (1) is fastened to theaxle flange and does not turn with the wheels. Thehead assembly has six pistons (4), three on eachside of the disc, and a friction lining (5) on eachside of the disc. Each lining is fastened to a metalbacking (6). Linings (5) and backings (6) are heldin place by anchor pins (8). When the brakes areactivated, oil pushes pistons (4) and linings (5)against these discs.When the brakes are activated, the hydraulic(brake fluid) pressure moves all pistons (4) and theamount of force on each side of discs (9) is thesame. The pistons do not have springs for return.NOTE: It is not necessary to remove head assem-bly (1) to remove linings (5) and metal backings (6).Remove bolts (7) and anchor pins (8). Remove thelinings and metal backings.RIGHT FRONT WHEEL BRAKE1. Head assembly. 2. Bleeder screws. 6. Metal backing.7. Bolt. 8. Anchor pin. 9. Disc.CAUTIONDo not activate the brakes with linings (5)removed. Pistons (4) must not come out oftheir bores when the linings are removed.Open bleeder screws (2) to release any pres-sure behind the pistons. If the pistons becomeextended and the seals can be seen, removalof the head assembly is necessary to installthe pistons again.CAUTIONDo not activate brakes when the linings areremoved or pistons (4) and seals (3) will bedamaged.3-88
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