Brake Bleeding: Service and Repair
Bleeding the brake systemDANGER: Porsche Stability Management does not work without values for the current brake pressure.
^ Danger of personal injury and material damage when the hydraulic unit is not calibrated.
-> After assembling the hydraulic unit, a static test and a swap test must be carried out with the Porsche System Tester.
-> After assembly of the brake master cylinder or the hydraulic unit, the pressure sensor must be calibrated with the Porsche System Tester.
Note:
^ Observe brake fluid quality. Use only new DOT 4 brake fluid.
^ The brake fluid change interval is two years, using Super DOT 4 brake fluid.
^ This brake fluid is available under the following part numbers: Container quantity: 1 liter = 000.043.203.66. 30 liters = 000.043.203.67.
1. Open reservoir.
2. Connect a bleeding device to the brake fluid reservoir. Switch on the bleeding device. Bleeding pressure is approximately 2.0 bar.
Note:
^ Always bleed both bleeder valves on the 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 is clean and free of air bubbles and to determine the amount of brake fluid used.
5. Open each bleeder valve until clear, bubble-free brake fluid emerges.
6. Tighten the bleeder valves to the specified 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.
Checking after bleeding
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 hydraulic system was largely empty.
Connect a bleeding device to the brake fluid reservoir. Switch on the bleeding device. Bleeding pressure is 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 bleeder valves to the specified 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.