In addition to the hydraulic drive of the foot brake, the rear disc brakes can also be operated by hand brake cables. The brake piston is pressed against the lining by a push rod via a lever to which the brake cable is attached.
It should be noted that the rear wheel brakes in front-wheel drive and all-wheel drive models differ in the type of hinge connection of the handbrake cable, but otherwise we are talking about the same brakes.
Automatic adjustment
In cars, automatic adjustment of disc brakes is determined by the design: as the lining wears, the brake piston simply moves further out of the brake caliper housing and ensures constant contact of the linings with the brake disc. Due to the brake fluid flowing in after it, no gap is formed.
This is not the case with a mechanical handbrake control: here the handbrake rod pusher will eventually fail to reach the piston, which is far outward, unless additional adjustment is made. It "lengthens" the pusher depending on the need.
The basis of the adjustment is the thread, along which the second part is unscrewed forward as the linings wear out - this way the pressure device becomes longer. Therefore, when replacing the linings, the brake piston cannot simply be pressed back, it must be screwed onto the adjustment mechanism.