My brakes fail and restores again. I notice that when this happens the ABS unit is very hot. When the ABS unit is cool the brake works again.The ABS yellow light has been on for a very long time now but the brake fails just started. never worked on the master/servo systems before. Car is above 230k kilometers. What can I do?? Thanks.



Most likely your abs module is going bad. I would start by reading the fault codes from the dsc module. You need a good BMW scanner for this. Or will have to take the car to the dealer.

If you read the trouble codes yourself let us know what they are. 


As MercedesMedic says, most probably your ABS module is failing. They are a known failiure point on many BMW models. 

Do you have only ABS, or DSC or Traction Control as well? 

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