Removing and installing the front brake disc: Installation

Check that all parts are in perfect condition and replace them if necessary.
Clean the levelling and centering surfaces on the brake disc and wheel hub. Then apply a very thin coat of Optimoly TA to the centering surface on the wheel hub.
Fit the brake disc.
NOTE: Do not confuse right and left brake discs during assembly. Distinguishing characteristic: Involute shape and spare part number (SP No.). The flat surface of the brake discs is marked with R = right or L = left (see Fig 1 ).

Spare part on left-hand side - third group number is odd

Spare part on right-hand side - third group number is even

Example:

SP No. Left brake disc: 996.351.405.01

SP No. Right brake disc: 996.351.406.01

Fig 1: Identifying Left Brake Disc
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Fit the brake caliper. Tighten the new screws of the brake caliper with 85 N.m (63 ftlb.). Ensure that the brake hose and brake line are in perfect position.
NOTE: Replace the brake caliper fastening screws after each removal.

On the 911 GT3, the brake caliper fastening screws on the front and rear axle are 5 mm longer than on the 911 Carrera (996). The screws are also different colours.

911 GT3 = red (77 mm long)

911 Carrera (996) = silver (72 mm long).