Thread: ABS Return Pump Sticking or Failure

Originally Posted by Scotty85

Mate keep us posted on how it goes!!

My Td5 has the ABS module failure too and I was considering the disco one as a replacement but was worried about the ABS firing on the wrong wheels when braking.

Direct swap, no problems, don't change order of brake lines or wiring. Leave the Defender Lines as marked FL FR RL RR from left to right.

I tested operation using Nanocom to confirm each wheel responds correctly.

The WABCO sticker was identical:

WABCO 003 1999 ABS (year was different)
478 407 022 0

WARNING: Don't proceed without a Nanocom or equivalent to bleed the brakes and modulator.

Note: I replaced the unit without removing the right hand guard, but it's a tight squeeze,

Originally Posted by shack

I also believe they are the same modulator, the pipe connections all look to be in the wrong order though, creating concern that the wrong wheel will be braked, however I think they do work fine and that in conjunction with the piping change, the wiring is also different on the defender to allow proper operation.

Someone with half an HR and the wiring diagram should be able to confirm this, but I'm not doing it!

Cheers
James

I can confirm there are differences in the wiring because if you've already done the SVS wiring bypass, you'll find the colour of the cable different. Same operation but red instead of yellow. Because I'm not changing the wiring or the Wabco ECU, I didn't spend much time comparing the two.

Another note is the diameter of the brake lines are different, so if you try to swap lines around to suit the Disco, you'll be in all sorts of pain.


I should also note that I'm not a brake or hydraulic specialist so don't take my word as fact. I have tried to be as accurate with my findings as possible but these are your brakes, don't kill people, see a specialist.