William Ortel Porsche Repair

Replacing the brake fluid Bleeding the brakes

Notes

Use only clean DOT 4 brake fluid. Total quantity for brake fluid change approx. 1 I.

The brake fluid must be replaced at least every 2 years.

Sequence of operation for bleeding and brake fluid change

- Fill reservoir with new brake fluid up to the upper edge. Connect bleeding device to expansion tank.

Turn bleeding device on. Bleeding pressure approx. 1,5 bar.

- Continue bleeding or changing the brake fluid, respectively, on the other brake calipers (no special sequence to be observed).

Open each bleeder valve until clear brake fluid or until the corresponding brake fluid change quantity per caliper (approx. 250 cm3) is reached, note that each four-piston fixed caliper must be bled at both bleeder valves.

- To check that escaping brake fluid is clean and free from air bubbles, and to determine the brake fluid quantity used, use a suitable receiver bottle.

- When changing the brake fluid, also drain some brake fluid from the clutch slave cylinder.

- Turn off and disconnect bleeding device.

If required, top up with fresh brake fluid.

- After fitting a new brake master cylinder, depress brake pedal fully several times with the bleeder valves open during the bleeding operation. This allows trapped air to escape from the brake master cylinder.