Adjusting Brake Push Rod Checking Stop Light Switch Adjustment

Printed in Germany - III, 1989

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Adjusting Brake Push Rod / Checking Stop Light Switch Adjustment

Adjusting Brake Push Rod

Checking Stop Light Switch Adjustment

The brake push rod is adjusted correctly, if the brake pedal plate is at the same height (± 3 mm) as the clutch pedal plate (clutch pedal in neutral position).

If the stop lights light up after 16 mm pedal travel, adjust the brake pedal on the pivot head of the brake push rod (lengthen the push rod) until the stop light switch responds in tolerance range.

The brake pedal does not have a stop. The permanently set clearance in the brake booster is guaranteed, since with a correctly adjusted brake push rod the brake pedal does not have any support in neutral position. A push rod play of approx. 8 mm will be noticed on the pedal plate of the brake pedal when operating by hand.

The position of the brake pedal is changed by correcting the push rod adjustment on pivot head (3). In this case it is therefore also necessary to check the stop light switch adjustment.

Stop lights must light up after the brake pedal has traveled 6 to 16 mm (measured at the middle of the pedal plate).

If the stop lights light up with less than 6 mm pedal travel, turn stop light switch (2) clockwise until it responds within the tolerance range (electric lead and plug must not be damaged in this step). Insofar as the correction range of the stop light switch is not sufficient, adjust the brake pedal on the pivot head of brake push rod (3) (shorten the push rod).

Checking and Adjusting Parking Brake

Checking Dead Travel of Parking Brake Lever

The parking brake employs brake liners without asbestos. Basically a parking brake with asbestosless brake liners must never be adjusted in such a manner that the liners must be "ground free" during operation.

Insofar as the parking brake lever can be pulled up more than 4 teeth with application of medium force, without any braking effect, the parking brake must be adjusted.

Adjusting Parking Brake

1. Remove rear wheels.

2. Release parking brake lever and push back disc brake pads on the rear axle until the brake disc can be turned easily.

3. Loosen adjusting nuts on the cable holder (arrow) until the cables are without tension.

Note

The cable holder is accessible after removal of the tray behind the parking brake lever (two mounting screws).

Porsche 964 Carrera
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4. Insert a screwdriver through the bore of the brake disc and turn the adjusting device until the wheel can no longer be turned. Turn back the adjusting device afterwards until the wheel can be turned easily. Then turn back (loosen) by two more catches.

5. Pull up parking brake lever two teeth and turn adjusting nuts on the cable holder so far that both wheels are hard to turn by hand.

6. Release the parking brake lever and check whether both wheels can be turned easily.

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