Bleeding The Brake System (And Replacing Hydraulic Unit)

Information 

• Observe brake fluid quality. Use only new DOT 4 brake fluid. 
• This brake fluid is available under the following part numbers: Quantity supplied: 1 liter = 000.043.203.66; 30 liters = 000.043.203.67. 
• There are two bleeder valves on the brake calliper. Brake fluid must be drained at both bleeder valves. Observe specified sequence: Bleed the outer bleeder valve first. 

1. Open the cap -1-  on the reservoir -2-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Brake fluid reservoir

2. Connect a bleeding device to the reservoir -2-  .
3. Switch on the bleeding device. Bleeding pressure is approx. 2.0 bar.
4. A second mechanic is required. Continuously pump the brake pedal slowly during the bleeding process.
   1. 4.1 Continue changing the brake fluid at the brake callipers. Observe the sequence specified on the Porsche System Tester: Front left/Front right/Rear left.
5. Open each bleeder valve until clear, bubble-free brake fluid emerges.
6. Use a transparent hose and a collecting bottle to check the escaping brake fluid for cleanliness, absence of air bubbles and to determine the amount of brake fluid used.
   1. 6.1 Only when replacing the hydraulic unit: 

   Bleed the secondary circuit using the Porsche System Tester. To do this, select >>PSM>>Maintenance/repairs>>Bleeding hydraulic unit<< in the control unit overview.

7. Then bleed the right-hand side of the vehicle manually again: Front right/Rear right.
8. Tighten bleeder valves to the specified tightening torque > Tightening torque 14 Nm (10.5 ftlb.) +/- 2 Nm (1.5 ftlb.)  and remove bleeder hoses.
9. Switch off the bleeding device and remove the adapter at the reservoir. The brake fluid level in the reservoir must be between the MIN and MAX markings after filling and bleeding the vehicle -1-  . Correct the brake fluid level if necessary.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   MIN/MAX markings for brake fluid

10. Remove the Porsche System Tester.