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Brake system

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.