UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Has anything after market been installed on your vehicle recently that was wired into your vehicle?
Was anything done on the vehicle recently that may have caused this issue here at all?
Let me know so we can continue,thanks Pete.
O.k.,the brake pedal when pressed activates the brake booster and the brake booster then signals the esp control module which in turn signals the rear sam to turn on the brake lights.There should be a sensor in the brake booster that activates the signal to the esp and so on to the sam unit.This sensor can fail and cause this here.I believe this sensor is the brake booster pressure sensor or brake pressure sensor and is usually located on the front or bottom of the brake booster itself.Usually the brake booster has to be replaced on some models in order to replace this sensor.
Usually if this was the rear sam at fault the issue would occur at all times and in this case it only occurs after the brake is applied so to me from here this sounds like this brake booster sensor is at fault needing replaced.
I would have this checked/tested further to verify this is the cause here.This usually requires a scan tool that can communicate with the brake system or a dealers sds machine to see if this sensor is sending an incorrect signal needing replaced.It is possible the rear sam is at fault but not as likely as the booster/sensor.
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