TAKdriver
Active Member
- Posts
- 621
- Location
- Beside a field in Midlothian
It is likely just to be the pressure switch. See my thread under FAQ's on testing your abs pump.
classic abs brake nightmares !!
- Thread starter rustyrangie
- Start date
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It is likely just to be the pressure switch. See my thread under FAQ's on testing your abs pump.
Derek Ward
Active Member
- Posts
- 798
If you have no rear brake pressure, it can be one of 4 things:
Hydraulic Booster Unit
ETC Valve Block (If fitted)
PCRV (Pressure Conscious Reducing Valve)
ABS ECU
Pressure to the rear wheels is controlled first by the PCRV, then by the ETC if fitted and then by solenoid valves in the hydraulic booster. If the PCRV isn't passing or the solenoid valves aren't opening, you won't get any pressure. I would think it unusual that both solenoids to the rear wheels would go. I would suspect the ABS ECU I think. Maybe worthwhile picking one up from Fleabay. I don't think they go for a lot of dosh. Much cheaper than a hydraulic booster unit anyway.
Hydraulic Booster Unit
ETC Valve Block (If fitted)
PCRV (Pressure Conscious Reducing Valve)
ABS ECU
Pressure to the rear wheels is controlled first by the PCRV, then by the ETC if fitted and then by solenoid valves in the hydraulic booster. If the PCRV isn't passing or the solenoid valves aren't opening, you won't get any pressure. I would think it unusual that both solenoids to the rear wheels would go. I would suspect the ABS ECU I think. Maybe worthwhile picking one up from Fleabay. I don't think they go for a lot of dosh. Much cheaper than a hydraulic booster unit anyway.
