WIS Document: 88

| | Brake system Brake pads, brake shoes and brake discs | • | Remove the wheels | • | Check the thickness of the brake pads and the condition of the brake discs. | • | It is advisable to change the pads when they have worn down to a thickness of 5 mm (0.16 in) or less. Rear brakes | • | Remove the brake pads. If they offer resistance, use special tool 89 95 771. | • | Clean the surfaces between the brake pads and brake caliper. Also inspect the dust covers. | • | Smear a thin coating of PBC copper grease on the contact surfaces of the brake pads and caliper. | • | Refit all components that have been removed. | Important | Pump the brake pedal to advance the brake pistons. | | Handbrake Check handbrake lever travel. If the wheels are not locked at the 6th notch, adjust the handbrake. | • | Before adjusting the brake shoes, check that the cable does not exert a pull on the lever. | • | Screw out the adjuster until the brake disc is blocked. | • | Then screw in the adjuster until the brake disc can rotate freely. It is extremely important to slacken the brake shoes by a sufficient amount to avoid rattle. This corresponds to 7 notches. | • | Repeat this procedure on the other rear wheel. | • | Replace the brake shoes if more than 10 thread turns of the adjuster are visible through the adjusting hole in the disc. | Check the amount of lever travel in reserve (cars with single-cable system) If the lever still travels past the 6th notch, the handbrake cable equalizer must be adjusted. | • | Pull up the handbrake lever to the 2nd notch. | • | Tension the cables by means of the adjusting nut on the rod until the brake starts to act. | • | Check the result. Repeat the procedure if necessary. | • | Refit the wheels Tighten the wheel bolts to a torque of: 117 Nm (86 lbf ft) - light alloy wheels 100 Nm (74 lbf ft) - pressed steel wheels | Important | Retightening to the correct torque must only be done with a torque wrench. | | Check the amount of lever travel in reserve (cars with two-cable system) | • | Pull up the handbrake lever to the 2nd notch. | • | Tighten the adjusting nut on the rod until the brake starts to act. | • | Release the handbrake lever and apply it again. The wheels should be locked at the 3rd-6th notch.