Fig. 6.3. Mechanism of the parking brake: 1 — a brake disk; 2 — brake shoes; 3 — the piston; 4 — a nut; 5 — the screw; 6 — a plate; 7 — a shaft; 8 — the lever; 9 — an arm; 10 — a ring; 11 — a ball; 12 — a spring; 13 — a floating bracket

The parking brake affects back wheels. Its driving lever is located between front seats. The lever is supplied with a ratchet which is released by pressing of the button on the lever. From the lever via the balance weight to each wheel there is a cable. When raising the lever of a parking (manual) brake the cable moves concerning the braid leaning on an arm 9 and for the lever 8 turns around an axis a shaft 7 on which other end the plate 6 with three conic nests of variable depth is located. In each nest there is a ball 11. Together with a ring 10 of these details form the mechanism which at a provorachivaniye forces a shaft 7 to move in the axial direction. Conic nests are executed so that originally big, in relation to rotary, axial movement, becomes small (loses in a way — wins in force). It increases the transferred effort. Axial movement of a shaft 7 is transferred to a screw head 5 which, squeezing a spring 12, 4 transmits effort through a nut to the piston 3 mounted in a floating bracket 13 and together with a bracket, working through brake shoes 2, clamps a brake disk 1. The effect of self-regulation of the parking brake occurs because in process of wear of couple "brake shoes — the brake disk" appears the increased gap and, without encountering resistance, a shaft 7 turns the screw 5 concerning a nut 4 that leads to reduction of a gap between brake shoes and a disk. Couple "the screw — a nut" (poses. 5 and 4) has a side play in the threaded connection that allows the brake mechanism to release a brake disk when the parking brake is not involved.