Hi Chaps,
As I have eluded to in other posts my car is close to making a come back. The current MoT fail list is broken coil spring (sledge hammer fix by putting Bilsteins all round) and the dreaded ABS/ASC light being on.
I know there have been a number of similar threads and apologies for starting another one but the others have all confused me greatly. My car (1990 V12) has the ASC+T and I have had problems for years with intermittent ABS light coming on. The lights always come on then go off a moment or two after the engine starts, then come on again as you move off. Normally a engine restart fixes it, sometimes I need to restart several times but it always goes off eventually. The car has been sitting (dying ) for the last three years and has spent the last few months being slowly fixed by a BMW specialist. As part of the fixes he had to replace all of the brake lines so the braking system would have had a shock. I haven't seen it with my own eyes but he tells me the ABS light is on so I assume it's the same old problem.
A few years ago I tried to read the codes using DIS. I could read almost all modules, but the ABS module couldn't be read. The mechanic has tried his code reader without success. I guess it could be a wheel sensor, but at £170 a go, trial and error doesn't seem like a good approach. I've read that even changing the pentosin can fix this? I don't understand how the ABS/ASC+T system works and I'd love to understand the relationship between the different components (pump, control unit, etc). Does anyone have any advice as to where to start with this?
So close yet so far, please help!!