Fig. 8.5. Brake mechanism of forward wheels: 1 — a brake disk; 2 — the basis of a brake bracket; 3 — the case of a brake bracket; 4 — brake shoes; 5 — the piston; 6 — a sealing ring; 7 and 9 — protective covers; 8 and 12 — bolts; 10 — the directing finger; 11 — a wheel nave; 13 — a block spring; 14 — a hose of a supply of brake fluid; 15 — the directing finger; 16 — the pumping valve

Brake mechanisms of forward wheels — disk with a floating bracket. The brake disk 1 (fig. 8.5) has air vents for reduction of heating when braking and fastens on a nave of wheels of a forward axis.

The floating bracket consists of the basis 2 which fastens to a rotary fist, and the case 3 which through the directing fingers 15 is movably connected with the basis. Protective covers protect fingers from hit in them of dirt and moisture. In the case 3 the piston 5 and details of its consolidation are placed: ring 6 and protective cover 7. For removal of air from the cylinder of the case the valve of pumping 16 with a cap is provided. Brake shoes 4 are located in a groove of the basis and are drawn in to basis ledges by the springs fixed on blocks.

For protection of working surfaces of a disk and blocks against hit on them of dust, dirt, lubricant the special guard is established.

When braking from liquid pressure in a hydraulic actuator the piston 5, moving in the case 3, presses an internal brake shoe to a disk 7, and the case, being displaced on fingers 15 in the direction opposite to the movement of the piston, presses an external block to a disk. Effort of a clip of both blocks to a disk equally and in direct ratio to pressure in a hydraulic actuator.

At a disinhibition of a block depart from a disk on the constant determined by rigidity of a sealing ring of the 6th piston. It reaches automatic control of a gap between blocks and a disk and wear of slips is compensated.