Removing and Installing Brake Pads of Four Piston Fixed Caliper Brakes

Notes

Brake pads are replaced in the same manner as for other Porsche vehicle types with four piston fixed caliper disc brakes. There is only a brief description of procedures for this reason. However, always pay attention to the following points.

Use specified brake pads (see Parts Catalog).

Replace damping plates each time brake pads are replaced.

Damping plates are covered with an adhesive and protective sheet. This protective sheet must be pulled off prior to installation.

Pad backplates (backs of brake pads) must not be lubricated with grease.

Removing

Compress cross spring in the middle and take it out of the holder. Press (release) cross spring in area of holder in direction of the brake disc at the same time or before the beginning of compression Damage on the holder is prevented in this manner.

Move out warning contact on the brake caliper and pull warning contact out of the brake pad plate.

Note

Replace warning contacts with ground or ground through electric lead cores. A warning contact can be reused when only the plastic part has traces of grinding.

Pull out brake pads with a brake pad impact puller and always conform with the following points.

Move out brake pads together with the damping plates. Insofar as this Is not possible (depending on the wear condition of brake pads), loosen the damping plates on the brake pad backplate with a spatula prior to removal of the pads. First set back the brake pads with a piston back setting tool as far as possible in both cases. If applicable, first draw some of the brake fluid out of the supply tank.

Installing

If applicable, set back piston into neutral position with a back setting tool.

Clean seating and guiding surfaces of brake pads in the brake calipers with alcohol and a cylindrical or special brush. Always make sure that the dust caps of brake pistons are not damaged during this step.

46 - 2 Removing and Installing Brake Pads of Four Piston Fixed Caliper Brakes

Printed in Germany - III, 1989

Insert new damping plates in the pistons. Since damping plates are covered with an adhesive and protective sheet, this protective sheet must be pulled off prior to installation.

Insert brake pads. Check for correct type of brake pads.

Note

Brake pad backplates (backs of brake pads) must not be lubricated with grease.

However, in order to prevent seizure of brake pads in the brake calipers due to corrosion, give the seating and guiding surfaces a thin coat of grease.

Use Optimoly HT (copper paste or Plastilube (Schillings, P. 0. Box 1703, D-7080 Aalen) for this purpose.

Lubricate attachment eyes of the cross springs with Optimoly TA or Plastilube.

If applicable, mount a new cross spring that its flat side faces the brake disc. Make sure that the cross spring engages correctly (arrow). Never engage the spring with force (danger of damaging holder).

Brake disc

Insert warning contact lead and warning contact. If necessary, disengage the cross spring again for this purpose.

Operate brake pedal of a stopped car firmly several times to move the brake pads into the seating equal to that of operating state.

Turn on ignition and operate brake pedal so often until the electric pump of the pump (for brake booster and lock control) is heard to run. Check / correct brake fluid level after the pump has been switched off.

Running-in Brake Pads

New brake pads require a running-in time of approx. 200 km (120 miles). Their most favorable friction and wear values are first reached then. During this period the brake should only be used for full-stop braking from high speed in an emergency situation.

Outside

Superbee Speed Pedal Spring Location

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