Anti-lock brakes locking up

[mjfeeney4]

The rear bakes have locked up for the third time and it appears that the ABS electronic unit is at fault. The problem has occured three times, where both rear brakes remain locked until either the electrical connector to the ABS system is removed or the car is completely cool. This is a 95 525I with ASC+T. Previous threads suggested that the master cylinder piston might be in question but this now appears to be electronic.

Right now I'm driving with the electrical connector unplugged and the brakes unlock as soon as the connector is removed. Any suggestions?

Thanks
Mike Feeney

[winfred]

i've had some abs pumps lock up one solonoid and keep pressure on one wheel

[Tiger]

It's probably the ABS relay that controls that selenoid went bad