15 QD134-15
RUN 3 (5 LAP RUN)
Driver:
o During this run build up to full brake pressure, and use the full rev range before shifting (9,250rpm).
Technician:
o
up sufficiently.
o Check the tyre pressures
o Check for play in the wheel bearings
o Re-check wheel nut torque for a final time (80ft/lbs)
RUN 4 (NORMAL SESSION)
The car can now be run as normal. After this session is complete it is recommended to spanner check the
whole car, again pay final attention for potential leaks and a give the car a good general inspection. When
spanner checking the car, ensure suspension components are not overtightened as this will restrict the
movement of these components.
3.2 BEDDING IN THE BRAKES
This procedure should be followed each time new discs are fitted to your car:
o 3 lap run - use the brake lightly (<10bar application) on the slow down lap and allow the brakes to cool
for 5 mins (be sure to not sit stationary in the pits with the brake pedal depressed)
o Next run 5 laps increase brake pressure to build up temperature in the discs (above 20 bar pressure).
The braking potential of the car will start to fade; this is a sign that the bedding procedure is complete.
o Complete a cooling down lap with moderate brake pressure before stopping the car. Allow the brakes to
cool for 15 minutes. Do not apply brakes whilst stationary during the cooling down period.
IMP ORTANT NOTES
With cast iron discs, brake pressures should not exceed 20bar during the out lap, even with pre-bedded
discs. This is to prevent heat shocking which causes the discs to crack, this occurs when the disc is taken from
ambient temperature up to 600°C very rapidly such as heavy braking on the out lap. When stationary never
hold pressure on the brake pedal, this can cause warping and/or the discs and pads to bind.
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