Removing and Installing the Front Disc Brake Pads - GT2 / Turbo With PCCB
Removing and installing the front disc brake pads - GT2 / Turbo with PCCBWarning:
Danger of accident if brake pads with the wrong brake pad quality are installed!
^ Use only the type-specific brake pads!
Note:
^ The GT2 is equipped with PCCB (Porsche Ceramic Composite Brake) as standard!
^ In contrast to this, at the start of production, steel brake discs and brake pads are used at first!
^ The pad backing plates (rear side of the brake pads) must not be greased!
^ 2 vibration dampers -arrows- are fitted on each of the brake-pad supports!
^ Vibration dampers are provided as additional damping measures!
^ Replace vibration dampers each time the pads are changed!
^ The damper plates have an adhesive protective film! The protective film must be pulled off before installation!
^ When fitting the vibration dampers on the small pistons, the cut-out on the vibration damper -arrow- is to be positioned at the brake pads guide pins as otherwise the vibration damper will be deformed!
Removal
Caution:
PCCB (Porsche Ceramic Composite Brake): Danger of material damage during wheel removal/installation (danger of damage to brake discs)!
^ Use assembly aids (assembly pins) in order to exclude any possibility of heavy contact of the wheel with the brake disc! The assembly aids (2 assembly pins) are located in the luggage compartment!
1. Screw the 2 assembly aids (assembly pins), instead of 2 wheel bolts, into the wheel hub before wheel removal/installation. During removal, first remove the three remaining wheel bolts and remove the wheel carefully, without touching the brake discs.
2. Undo the screw on the retaining pin. Counter the retaining pin when doing this.
3. Pull out the retaining pin towards the inside.
4. Pull out the warning contact wire on the brake caliper and remove the warning contacts from the brake pad plates.
Note:
^ Replace warning contacts if the core of the wire is worn or worn through!
^ The warning contact can continue to be used if there are only scrape marks on the plastic pail of the warning contact!
^ If necessary, remove some brake fluid by suction from the brake fluid reservoir (brake fluid may escape over the rim of the container)!
5. Set back the brake pads as far as possible with the piston resetting fixture (press back)!
6. Pull out brake pads together with the damper plates (remove). If this is not possible (depending on wear of the brake pads), use a spatula to detach the damper plates from the brake pad backing plate before removing the pads.
Installation
Warning:
Danger of accident if old parts are fitted on brake caliper!
^ Fit new expanding spring and new retaining pin with a new screw on the brake caliper!
Note:
^ Ensure correct brake pad quality! Use brake pads!
^ The pad backing plates (rear side of the brake pads) must not be greased!
^ For a wheel installation, 2 assembly aids (assembly pins) must be screwed into the wheel hub!
1. Before installation of the brake pads, check the wear of the brake discs => Page 264 'Checking front PCCB brake discs (wear assessment)'. Checking Front PCCB Brake Discs (Wear Assessment)
2. If necessary, press back the piston to its original position using the resetting fixture.
3. Fit new damper plates in the pistons. As the vibration dampers are provided with a protective film, the protective film must be removed before installation.
4. When fitting the vibration dampers on the small pistons, the cut-out on the vibration damper -arrow- is to be positioned at the brake pads guide pins as otherwise the vibration damper will be deformed!
5. Insert the brake pads.
6. Fit new expanding spring and new retaining pin with a new screw on the brake caliper! These parts are available as a repair set and must be renewed each time the pads are changed. When tightening the screw, counter at the retaining pin! Tightening torque of the screw = 25 ± 3 Nm (2 ft. lbs.)
7. Insert the warning contact wire and warning contacts.
8. Firmly press the brake pedal several times to position the brake pads on the brake discs.
9. Check and, if necessary, correct the brake fluid level.
Bedding in the brake pads
^ New brake pads require a slightly longer bedding-in period for PCCB brake discs than cast iron brake discs.
^ In general, the following applies: New brake pads must be broken in (bedding-in period), their optimum braking effect is therefore not reached until after a few hundred kilometers. The slightly reduced braking effect must be compensated for by increased pressure on the brake pedal. The same also applies after a brake disc change.