Thread: ABS Problem

Originally Posted by Mr Whippy

I have adjusted the wheel bearing and it seems to have solved that problem.

My next problem. Firstly, when I drive off the ABS light goes out at about 7 kph, as it should. When I stop should it come back on or does it just do this from the first drive off after starting vehicle. I have been driving with the light stuck on for so long I have forgotten. In my case it stays off until I switch off and restart the engine

Secondly I am still having problems with my braking. Some times when braking the pedal feels like the ABS is activating even when there is no wheel lock up. When this happens the stopping distance is increased. This seems to have corrected itself since fixing wheel sensor problem and clearing fault.

What is now happening is(and this is intermittent) when braking it feels like the ABS pump is working but pumping back at the pedal. The pedal hardens up with spring and grinding type noises. When I push really hard I overcome it and braking returns to normal.

I suspect this is a dodgy ABS pump but before I source another one is there anything else it could be and checks I can make?

When I do a self test it shows up as all good.

Also are V8 and TDI ABS pumps the same?

Dave.

Unfortunately Dave you most likely DO have a faulty wheel sensor, most likely a front one. It hasn'r registered a hard code yet as it is 'working' after 7km'h, but the symptom of the ABS pulsing while applying brake normally without lock up means one or more sensor is at fault, but not actually 'faulty' according to the computer. I suggest finding a dirt road somewhere and see if 1 wheel consistently locks, this will be the faulty sensor.

My money is on one of the front ones.

JC

"Should the ABS light come back on every time the vehicle drops below 7kph"

No.

"In my case it stays off until I switch off and restart the engine"

Perfect.

It's just part of the self check that the system performs but can not be completed till a certain speed has been reached. Once it's done, it's done.