As an adjunct to my earlier (embarrassing) question about retro-fitting ABS to a car that already has it...
I've now found that the rear left brake calliper isn't receiving any brake pressure and if I disconnect the brake line at the ABS unit, it isn't pressurised.
So I'm guessing at a stuck valve within the ABS control unit.
I've tried driving the car and braking hard to get the ABS unit to kick-in - which it does, but this doesn't free the valve.
I've also tried to cycle the ABS unit electronically using a fault reader set to BMW X5 (which reads the ECU) but it tells me that the ABS unit can't be cycled electronically.
Any ideas (other than hit it with a hammer) ?
