ABS problem

[discoeverywhere]

i have a problem with my 2003 D2. The Abs system has been a frustrating nightmare. I have had the park Brake-ABS-Traction-HDC lights which is apparently rear wheel sensor. i had the system reset several times (worked for a while), rear sensor cleaned (after i could not reset by disconnecting the battery) and then finally replaced. the other day under heavy braking the ABS-Traction-HDC trio came on (and stayed on) and then went off when i restarted the vehicle 10 minutes later. Is this an indication that a front sensor is going or could it be a temperamental earth problem perhaps. Does anyone have any ideas or has experienced similar problems? I heard a similar story through the grape vine and the problem was supposedly fixed by replacing the battery which does not seem logical to me.

[Winaje]

I doubt replacing the battery will help...  Are you using non-genuine brake pads?  I have heard that the aftermarket pads can sometimes cause a problem, as they tend to vibrate more, which can upset the sensors.  I have had the 3 lights on for about 4 years...!  The problem in my vehicle is in the right front sensor.

[GrumpyBastard]

I have the "3 amigos" currently, but they came on due to me letting the front pads and discs wear waaaay beyond what they should have been.

(after i could not reset by disconnecting the battery)

Im curious though.... disconnecting the battery clears faults? I thought all faults needed to be cleared with a test book?

BTW just as a side note, i purchased my pads and rotors from http://www.roverparts.com.au ....seemed to me good prices??

[bruiser69]

i have a problem with my 2003 D2. The Abs system has been a frustrating nightmare. I have had the park Brake-ABS-Traction-HDC lights which is apparently rear wheel sensor. i had the system reset several times (worked for a while), rear sensor cleaned (after i could not reset by disconnecting the battery) and then finally replaced. the other day under heavy braking the ABS-Traction-HDC trio came on (and stayed on) and then went off when i restarted the vehicle 10 minutes later. Is this an indication that a front sensor is going or could it be a temperamental earth problem perhaps. Does anyone have any ideas or has experienced similar problems? I heard a similar story through the grape vine and the problem was supposedly fixed by replacing the battery which does not seem logical to me.

I suspect Shuttle Valve Switches in ABS modulator or possibly the internal connection post that connects to shuttle valves. I have had "3 Amigos" twice with my 2000 TD5 and both occasions it was shuttle valves. If you look on AULRO Discovery 2   http://www.aulro.com/afvb/discovery-2/94638-bloody-3-amigos-again.html    you will see how I fixed problem hopefully permanently. Note that if the problem is the internal connection to shuttle valve switch assy, then you can perform surgery on it & resolder, or bring this connection out thru switch assembly to an external connector. If you follow my instructions on how to test SVS assy you will know exactly where problem lies.
Cheers..B

[Winaje]

Some excellent info there, thanks Bruiser.

[bruiser69]

Some excellent info there, thanks Bruiser.

Here is another link with images I took when performing shuttle valve switch replacement & upgrading shuttle valve seals to prevent hydraulic oil from damaging new switches http://www.aulro.com/afvb/electronic-diagnostics/95891-replacing-shuttle-valve-switches-need-nanocom.html
I hope this helps owners to diagnose "3 Amigo" issue & repair it themselves.
Cheers..B

[discoeverywhere]

ended up being shuttle valve and then replacing master cylinder as there was gunk in there that kept finding its way into the ABS. all good now though.