In addition to the hydraulic drive through the brake pedal, the disc brake mechanism can also be serviced by a cable drive of the parking brake system. The lever, on which the corresponding cable is fixed, actuates the pusher, with which the brake piston is pressed against the shoes.
Front-wheel drive and all-wheel drive models have different disc brake caliper housings, which, however, differ mainly in the way the cable is connected.
Automatic regulation
The design of disc brakes in a car is always self-adjusting: as brake pad wear increases, the brake piston simply moves further out of the disc brake caliper, thereby ensuring that the brake pads fit snugly against the brake disc. Due to the filling of the added volume in the cylinder with brake fluid, the formation of play is impossible.
It happens differently in the mechanical drive of the parking brake system: here the pressure pusher of the drive at some point in time simply could not reach the outgoing piston if there were no adjusting device. It «lengthens» pusher as needed.
Parts of the removed drum brake mechanism. The arrows show where to hang the springs. The numbers indicate:
1 - front brake shoe;
2 - clamp with a spring, a spring plate and a mounting pin;
3 - push rod;
4 - return spring;
5 - adjusting wedge;
6 - tension spring of the adjusting wedge;
7 - lower return spring;
8 - main spring;
9 — the lever of inclusion of a parking brake;
10 - friction lining on the rear brake shoe;
11 - clamp.
The main part of the regulation is a thread, on which, depending on the wear of the pads, a part of the pusher is screwed further and further forward. The pressure device thus becomes longer. Therefore, when replacing the pads, you cannot simply push the brake piston back, it is unscrewed back on the adjusting device.
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