Tuercas viejas
MB Enthusiast
Yes OK, but where is the scan tool print out with wave form evidence to back up the original diagnosis to present to the customer ?My statement about pad wear was based on the OP’s car - an eight year old W204 with 61k miles, that had been MOT tested and serviced at a Mercedes-Benz main dealer just a few days before.
It actually said:
MOT checks include the minimum thickness of brake linings, the braking performance itself on a rolling road, wheel bearings and indeed imbalance/brake fluctuations would be picked up on this test. Likewise a main dealer would not miss a chance to increase those brake condition assessments from amber to red, or indeed other noted wear items including wheel bearings.
Your description of the braking system and diagnostics is sound, but so is the logic that W204 wheel speed sensors are prone to failure, the symptoms described by the OP and that the car has already been diagnosed with this specific fault by a mechanic
No mention of adverse braking performance from the OP either. Surely it would in the first instance just kick the ABS/ESP systems into operation in a similar way to a loss of traction on one corner anyway - rather than a stored fault code for an implausible wheel speed sensor on one corner (?)
At this stage, I would still give credit to the original diagnosis and perhaps start with the obvious - the wheel speed sensor on the NSF - that’s where my money would be
That is my overall questioning as a shop owner selling the job?
I don't give rip as to what the MOT inspectorate equivalent has to say about it , nor do I want to dealer diag on it as well. (It will go into "Customer States" on the opening of the R/O by my Service Writer )
I want to see it on my shop's rolling road, and on my tech's roads test .to see if I can verify the condition & sell the job .
Retaining customer confidence is job #1 here !
Tuercas viejas