Run flat tyres
Principle of operation
Wheel rim position with correct tyre pressure A Wheel rim position with insufficient tyre pressure B Tyre C
Run flat tyre
Wheel rim position with correct tyre pressure A
Wheel rim position with insufficient tyre pressure B
Reinforced sidewall D
When a standard tyre experiences a drastic loss of inflation pressure, the rim of the wheel brings the full weight of the vehicle to bear on the collapsed sidewalls.
You can barely manoeuvre the vehicle and the tyre is destroyed.
Run flat tyres have sturdy, reinforced sidewalls that support the rim should the tyre suffer a loss of inflation pressure.
What to do if a run flat tyre has a puncture
Due to the run-flat properties of these tyres, you may not notice any tyre defect.
Your vehicle is equipped with a tyre pressure monitoring system that alerts you to any drop in tyre pressure. See Technical specifications.
In the event of a tyre defect:
Х immediately slow down to a maximum speed of 80 km/h (50 mph).
Х avoid sudden or erratic braking and steering manoeuvres and be especially careful negotiating bends.
Х do not drive more than 80 kilometres (50 miles) after the defect is detected.
Х have the defective tyre replaced as soon as possible.
Replacing run flat tyres
Make sure that the workshop is aware that your vehicle is equipped with special run flat tyres.
Never repair or reuse run flat tyres that are damaged or have been driven on run flat.
If a run flat tyre has to be replaced, have the respective wheel rim inspected for any damage.
Do not fit a mixture of run flat and standard tyres. In isolated cases, a standard tyre can be temporarily mounted on a vehicle otherwise equipped with run flat tyres. It must be pointed out to the driver that the standard tyre has no runflat properties.
Do not fit run flat tyres on vehicles that were not originally fitted with them. Please contact your dealer for more details regarding compatibility.
Run flat tyres may be sold and mounted only by specially trained and certified tyre dealers.
Hydraulic unit accumulator (ABS) - removal and refitting
Note: A new O-ring must be used between the accumulator and the hydraulic unit on refitting. Caution: Refer to the precautions in Section 1. Removal 1 Disconnect the battery negative lead. 2 De ...
Pistons and connecting rods - examination and renovation
1 Examine the pistons for ovality, scoring, and scratches. Check the connecting rods for wear and damage. The connecting rods carry a letter indicating their weight class; all the rods fitted must ...
Using stability control
Note: The system will be switched on automatically every time you switch the ignition on. To turn the system off and on. See Information displays. ...