| 摘要 |
The brake system for a motor vehicle has an electromechanical wheel brake actuator mounted on each brake caliper of each wheel. The actuator is controlled by the brake pedal through electric lines and it has a brake piston disposed in a cylindrical bore formed therein. A spindle drive moves the brake piston axially and presses to piston against the brake lining, which effects the braking action on the respective wheel. A piston sealing ring limits the axial movement of the brake piston within the cylindrical bore. A transformer part connects to the brake piston via a non-self-locking pair of threads. A main spring in the brake actuator compensates for brake lining wear. The main spring, upon a return stroke of the spindle drive into a position of repose, moves the transformer part axially out of the brake piston while the brake piston is firmly held by the piston sealing ring.
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