My son in law has a 2003 st170 estate. I replaced the front pads and the rear discs and pads. Since I did them the abs and traction control lights are on all the time. Have a diagnostics checker and no faults show up. No fuses are blown and the brakes are working well. Looked at the abs sensors. Front ones look like they sense off the wheel bearings and both look OK from the outside, no damage. can't find any back ones so presume it's not got any.

Only thing that was odd when I did job was that when I pushed the front nearside cylinder back in I noticed some oil running out of the engine bay onto the floor, as if the master cylinder reservoir overflowed. It was the second one I did out of the 4 and it didn't happen with the other 3. As the brakes still work fine I didn't worry about it.

What do you guys think could be the problem. All suggestions welcome as we need to get it through the mot.

 

Which diagnostic checker do you use?
Or, in other words: is it capable of reading the ABS and not just the engine?

 

Are the wheel bearings ok? Knackered wheel bearings give dodgy signals and mess the abs and tcs up

 

I have a basic scantool.net compact 5 and the obdwizz program. I have emailed scantool to see if I can upgrade to something that will interigate the abs directly.

The bearings could be damaged as could the sensors I suppose but it just seems a massive coincidence that it happened when I replaced the pads and rear discs. All of which went on without a hitch.

 

hi there what did you do to solve this issue as iv done the same and both lights are on but no error codes

 

Really sorry but that was a very long time ago and I can’t remember.