Installing Hydraulic Unit
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Pressure sensor not calibrated or calibrated incorrectly
- Unexpected vehicle handling
- PSM does not function
- PSM malfunction
→ After fitting the brake master cylinder or the hydraulic unit, calibrate the pressure sensor using the PIWIS Tester 9718.
→ To do this, calibrate the pressure sensor in the menu >> PSM >> Calibration >> Pressure sensor <<.
→ The security code is stored under >> PSM >> Actual values >> Security code <<. The code is entered in the last four positions.
Information
- When fitting the hydraulic connections, the electric plug connections on the control units must remain connected as long as possible. This prevents the plug connections on the hydraulic unit or in the connectors inside from being splashed with brake fluid or water.
- Any damp connector must be wiped dry before being disconnected from the connector on the hydraulic unit. If necessary, provide the connector with a suitable protector.
- Brake fluid on electrical contacts (even thinned brake fluid) leads to corrosion and may cause faults in the system.
- The brake lines must not be bent in the area of the hydraulic unit.
- Clean the interfacing points of the brake lines, but not with cleaning agents.
- Rinse off any brake fluid emerging thoroughly with water.
Information
- Install in reverse order.
- Remove the plugs on the new hydraulic unit after the respective brake line is fitted.
- Pay attention to tightening torques.
- Bleed the brake system. To ensure the full function of the brake system, drain approx. 250 ccm brake fluid from each wheel Bleeding the brake system .
- Calibrate the pressure sensor with the → Porsche System Tester. To do this, select menu >> PSM >> Calibration >> Pressure sensor <<. The security code is displayed in the Porsche System Tester under menu >> PSM >> Actual values <<.
- The combination sensor (which contains the longitudinal and transverse acceleration sensor) and the steering-angle sensor must then be calibrated. The procedure for this is described in Step 2.
- Perform a swap test with the Porsche System Tester. To do this, select menu >> PSM > > Function selection >> Drive links <<.
Information
When replacing the hydraulic unit, the connected control mechanism must be coded with the Porsche System Tester (running gear and country coding).
- To do this, select menu >> PSM >> Function selection >> Coding <<and the relevant country. Observe the country coding!
- Code hydraulic unit.
- Perform a function test. During the test drive, perform at least one ABS control operation, taking the road conditions into consideration. Read out fault memory. There must not be any stored faults.