Bleeding brakes
CAUTION:
For vehicles with extremely high mileage or for very old vehicles, damage to the brake master cylinder can occur and the primary boots can be damaged!
- Double the number of pumping cycles and use only half of the master brake cylinder stroke!
- Fill reservoir to its top edge with new brake fluid.
- Connect a bleeding device to the brake fluid reservoir. Switch on the bleeding device. Bleeding pressure approximately 2.0 bar.
Courtesy of PORSCHE OF NORTH AMERICA, INC.
NOTE: Bleed the outer bleeder valve first! - Continue bleeding at the brake calipers in the sequence: Sequence: Rear right / rear left / front left / front right.
- Open each bleeder valve until clear, bubble-free brake fluid emerges.
- Use a transparent hose and a collecting bottle to check the escaping brake fluid accurately for cleanliness, lack of air bubbles and to determine the brake fluid used.
After installing a new brake master cylinder and/or a new hydraulic unit, do the following while bleeding:
- Open the right rear bleeder valves, then fully depress the brake pedal several times.
- Hold for 2 - 3 seconds after each depression, then release slowly.
- Repeat this procedure in the sequence rear left / front right / front left. This will remove all air bubbles (from the primary circuit).
NOTE: Also carry out this procedure if the brake hydraulics was largely empty or if after bleeding residual air can be detected by excessive brake-pedal travel! - Switch off and disconnect the bleeding device. Correct the brake fluid level if necessary.