Brake Bleeding: Service and Repair

Bleeding brake system
Notes

Note!
^ Observe brake-fluid quality! Use only new DOT 4 brake fluid!
^ The brake fluid change interval is 2 years in conjunction with Super DOT 4 brake fluid!
^ This brake fluid is available under the following part numbers: Quantity supplied 1 litre= 000.043.203.66! Container quantity 30 liters = 000.043.203.67!

Procedure for bleeding

Caution! After installation of the brake master cylinder or the hydraulic unit, the pressure sensor must be tuned with the Porsche System Tester via the diagnosis! The PSM does will not work without values for the current brake pressure!

Step 1: Bleeding brake system





1. Open expansion tank.
2. Connect a bleeding device to the brake fluid reservoir. Switch on the bleeding device. Bleeding pressure approximately 2.0 bar.

Note!
^ Always bleed at both bleeder valves at brake caliper!
^ Bleed the outer bleeder valve first!

3. Continue the bleeding procedure at the brake calipers. Do so in the following sequence: rear right / rear left / front right / front left.
4. 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.
5. Open each bleeder valve until clear, bubble-free brake fluid emerges.
6. Tighten the bleeder valves to the stipulated tightening torque and remove the bleeder hoses.





7. Remove bleeding device from brake fluid reservoir and screw cap on. The brake fluid level in the brake fluid reservoir must be between the MIN and MAX markings once the vehicle has been filled and bled. Adjust the brake fluid level if necessary.
8. Generate vacuum in brake booster by starting engine. Check brake-pedal travel and pedal feel.

Note!
^ If the pedal travel is too long or the pedal feels too soft when applied, carry out the following procedure!
^ Two workers are required for this!
^ Also carry out this procedure if the brake hydraulics were mainly empty!
^ Connect bleeding device to the brake fluid reservoir. Switch on bleeding device. Bleeding pressure approximately 2.0 bar.

1. Open bleeder valve at rear on right-hand side, then push the brake pedal all the way down about 5 times and tap the brake caliper gently several times with a rubber hammer during the bleeding process.
2. Hold for 2 - 3 seconds after each depression, then release pedal slowly. After applying pedal for the fifth time, hold pedal down and close bleeder valve.
3. Repeat this procedure in the sequence rear left / front right / front left.
4. Tighten the breeder valves to the stipulated tightening torque and remove the bleeder hoses.
5. Remove bleeding device from brake fluid reservoir, correct brake fluid level is necessary.
6. Generate vacuum in brake booster by starting engine. Check brake-pedal travel and pedal feel.