Brake System Test Procedure

If the cylinder does not have a white paint dab on the nose or a date code 335 or higher, perform this test to determine if the cylinder is defective. Two technicians are required -- one in car and one at front wheels.

1. Place car on hoist and lift car until both front wheels clear the ground and the technician has access to the left front brake bleed screw.
2. Start engine so that there is a constant supply of vacuum to the brake booster.
3. Loosen the left (driver's side) front disc brake bleed screw and attach a drain hose routed to a suitable container.
4. With the bleed screw open, depress the brake pedal hard (about 15O lbs.) until it "bottoms" out and hold it in this applied position until instructed to release it in step # 6.
5. With the brake pedal still in the applied position:

^ Verify that the left front wheel can be turned freely by hand.
^ Then tighten the bleed screw while the brake pedal is still in the applied position and attempt to rotate the other (right) front wheel by hand. If it turns, the master cylinder must be replaced. If not, proceed to step # 6.

6. Release the brake pedal.
7. Depress the brake pedal hard until it again is bottomed out. While holding the pedal in the applied position, check both front wheels by hand for rotation. If either wheel turns, the master cylinder must be replaced. If not, release the pedal and depress it again to repeat this step three more times. If either wheel turns with the pedal held down, the master cylinder must be replaced. If neither of the wheels turns, the master cylinder is functioning properly.
8. If the car passes steps # 5 and # 7, top off brake master cylinder reservoir and apply a dab of white paint to the forward nose of the master cylinder. No further-service is required.
9. If the car fails steps # 5 or # 7, replace the master cylinder per Service Manual instructions and apply a dab of white paint to the forward nose of the new master cylinder.