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      04-24-2012, 01:18 PM   #22
SkinnyVT
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Not sure the X5 statement applies to our car, seems as though it is a part of the Active Cruise Control, http://www.bmw.com.au/com/en/insight...-dynamism.html
Quote:
In addition, the controlled downhill driving system incorporates a wheel-brake reduction through drive torque shifting and power reduction, which counteracts brake overheating particularly when towing a trailer.
However I did find in mentioned in reference to the 5 series, also states that there should be a log everytime it happens.
http://www.micro-tronik.com/main_functions_332.html
Quote:
Engine torque reduction in response to overheating brakes
The brake temperature is calculated by the DSC control unit individually for all four discs. The input variables used are the wheel speed, the individual brake pressure for each wheel, time and ambient temperature.
At brake temperatures upwards of about 600 Deg C, the brakes are protected against overheating by
· limiting engine torque
· preventing action of differential locks on individual wheels
· Not allowing symmetrical braking torque on the relevant pair of wheels.
Once the brake temperature drops below approx. 500 Deg C, the engine torque is allowed to gradually increase again over time and intervention by the control systems is allowed again.
If the brake temperature has exceeded 600 Deg C, an entry is made in the fault memory. This is for the information of the service department - not that there has been a fault, but that a safety mechanism has been activated.
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