Steering and Suspension: Service Precautions
WM 4X00IN Safety notes and information when repairing the running gear
Tools
General warning notes
Fitting vehicle parts
WARNING
Incorrect handling of safety bolts
- Danger of injury
- Loss of torque
-> Always use new fastening screws and nuts following removal.
-> Observe specified tightening torques.
-> Carry out a visual inspection of all re-used parts.
Spring struts/coil springs
WARNING
Installation of incorrect or damaged coil springs
- Different vehicle handling
- Coil springs can break
-> Examine the components carefully before installation.
-> When installing new coil springs/spring struts, make sure they are assigned correctly.
-> Only use a suitable tool for removing and installing coil springs.
-> Do not weld or grind, or use a hammer close to the spring struts.
-> Do not apply colour markings to the coil springs.
Wheels and tyres
WARNING
High tyre seating pressure
- Risk of squashing or bruising
-> Use a tyre filling cage.
Information
- Newly mounted tyres require a bedding-in period to remove the vulcanisation layer.
- Customers must be informed that the full performance of new tyres is achieved only after a distance of 100 to 200 km (60 to 120 miles) has been driven. Avoid extreme driving manoeuvres (acceleration, braking) during this time.
Working on vehicles with PSM
WARNING
Steering-angle sensor not calibrated or calibrated incorrectly
- Unexpected vehicle handling
- Steering-angle sensor does not function
- Malfunction in steering-angle sensor
-> After working on wheel suspension parts, when replacing the steering-angle sensor and after changing the wheel alignment values, calibrate the steering-angle sensor using PIWIS Tester II 9818.
-> Keep the front wheels in straight-ahead position on the measuring platform during calibration.
-> Check the actual value of the steering-angle sensor after suspension alignment where no changes were made to the wheel alignment values.
Brake system
WARNING
Installation of brake pads with the wrong brake pad quality
- Longer braking distance
- More wear on brake pads
-> Only use the type-specific brake pads listed in the Porsche Parts Catalogue.
-> Replace the brake pads when the brake pad wear indicator light comes on, but no later than when there is a residual pad thickness of 2 mm on each axle.
-> Replace the brake discs on each axle as soon as the brake pad wear limit is reached.
Information
- Observe brake fluid quality. Use only new DOT 4 brake fluid.
- The brake-fluid change interval using Super DOT4 brake fluid is two years.
- This brake fluid is available under the following part numbers: Container quantity: 1 litre = 000.043.203.66. 30 litres = 000.043.203.67.
Handling airbag systems
WARNING
Installation of brake pads with the wrong brake pad quality
- Longer braking distance
- More wear on brake pads
-> Only use the type-specific brake pads listed in the Porsche Parts Catalogue.
-> Replace the brake pads when the brake pad wear indicator light comes on, but no later than when there is a residual pad thickness of 2 mm on each axle.
-> Replace the brake discs on each axle as soon as the brake pad wear limit is reached.
Information
- Observe brake fluid quality. Use only new DOT 4 brake fluid.
- The brake-fluid change interval using Super DOT4 brake fluid is two years.
- This brake fluid is available under the following part numbers: Container quantity: 1 litre = 000.043.203.66. 30 litres = 000.043.203.67.
Steering
WARNING
Installation of brake pads with the wrong brake pad quality
- Longer braking distance
- More wear on brake pads
-> Only use the type-specific brake pads listed in the Porsche Parts Catalogue.
-> Replace the brake pads when the brake pad wear indicator light comes on, but no later than when there is a residual pad thickness of 2 mm on each axle.
-> Replace the brake discs on each axle as soon as the brake pad wear limit is reached.
Information
- Observe brake fluid quality. Use only new DOT 4 brake fluid.
- The brake-fluid change interval using Super DOT4 brake fluid is two years.
- This brake fluid is available under the following part numbers: Container quantity: 1 litre = 000.043.203.66. 30 litres = 000.043.203.67.