Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Specific Foot Brake, Rear
Self-adjustment
The rear foot brake contains a self-adjusting parking brake mechanism. The adjustment (compensation for wear on the brake pads and discs) takes place when braking using the foot brake. The clearance in the thread between the adjuster screw (2) and the adjuster nut (3) determines whether adjustment takes place.
When the brake pedal is pressed down, the hydraulic pressure forces out the piston (1). The adjuster nut (3) and the adjuster screw (2) follow this movement.
When the brake pedal is released, the piston is pressed back slightly by the tension in the piston seal. The adjuster nut (3) is pressed against the piston by the control spring (7), at the same time as the return spring (5) presses the adjuster screw (2) against the arm (13).
If the relative movement exceeds the clearance in the thread, the adjuster nut will be twisted to a new position further out on the adjuster screw.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.