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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
This does sound like a fault with the pre safe engaging due to the computers thinking you are in a skid situation.This can be due to a fault with a failing wheel speed sensor sending a false signal needing replaced or an issue with a component like a failing yaw rate sensor needing replaced.The fault codes have to be read out with a compatible scan tool or computer that will plug into your vehicle to see what codes are set.Once this is done any codes set then need diagnosed to then locate and repair this issue here.If no codes are set I would drive the vehicle with a compatible scan tool plugged into it to monitor the speed sensor signals to locate the faulty sensor needing replaced.
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O.k.,that worn brake pad and caliper issue is most likely related.If that wheel speed sensor on that wheel area is reading an incorrect wheel speed signal it will cause the computer to try and brake that wheel which will wear it down like you had to replace as well as cause the pre safe to engage.There usually wont be any codes set.What needs to be done is to have the vehicle driven with a scan tool or dealers sds machine plugged into your vehicles data port to monitor the wheel speed sensor signals.Once this is done I suspect it will be seen that the wheel that had the worn brake will show its wheel speed sensor signal as reading incorrect compared to the others and the sensor will need replaced.I dont know of a sensor behind the sign myself that can cause this issue.Usually it is a failing wheel speed sensor or yaw rate sensor at fault.
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