The tyre pressure control system (RDC) electronically monitors tyre pressure at all four wheels by means of sensors. Depending on model and equipment, the tyre pressure indicator enables current tyre pressure to be monitored in the Control Display or instrument panel. All new BMW automobiles have been fitted with this system as of March 2014.
The right tyre pressure reduces the risk of tyre damage, thereby increasing safety. Only at the correct pressure does the tyre provide the optimum contact surface on the road, offering excellent performance for a sporty driving style as well as for avoidance or braking manoeuvres.
If the tyre pressure control system measures a critical deviation in pressure (20% below target or below the minimum pressure of 1.7 bar), it notifies the driver early on of the potential risk by means of a warning signal, as well as providing feedback on the tyre in question via the Control Display or the multifunction instrument display.
The tyre pressure control system makes for long-term economy: since tyres at the correct pressure generate less rolling resistance, this has a positive impact on fuel consumption. What is more, correct tyre pressure prevents irregular wear and tear, thereby extending the tyre's service life.
BMW offers all complete wheel sets including wheels with star marking and fitted with RDC sensors. Your BMW Service Partner will be glad to advise as to whether your automobile is fitted with a tyre pressure control system and which tyres best meet your requirements. In the event of a change of tyres, our experts ensure the tyre pressure control system remains in perfect working order, setting the correct tyre pressure and programming the RDC system accordingly.
Tyre pressure depends on the temperature of the tyre. If the temperature of the tyre increases, e.g. when driving or due to sunlight exposure, tyre pressure increases, too. A reduction in pressure can occur when the temperature of the tyre drops. In the case of severe reductions in temperature, this can result in a warning being issued due to the set warning limits. For this reason, tyre pressure should be checked at regular intervals at ambient temperature ("cold tyres").
As the driver of a new automobile with a tyre pressure control system, you should take care when you purchase winter tyres to ensure these are fitted with an RDC sensor. Emergency wheels are not fitted with sensors. If an emergency wheel is fitted after a drop in pressure, the warning remains in place until a new wheel is mounted that is fitted with a new sensor as required. The system cannot give previous indication of sudden tyre damage caused by external impact.