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MK1 ABS problem

Posted: Tue Mar 23, 2010 7:54 pm
by JP
Hi !

ABS system of my 480 is acting strange lately.

This is what happens:

-First turn the ignition on: "Ok" signal on board. ABS light and pump of ABS system, on for 1 or 2 seconds. Then they shut down.
-Turn the engine on and everything works flawlessly.... till i press the brake pedal. At this moment the ABS light, the (!) light and the ABS pump turns on but shut down almost instantly. When driving if i foot the pedal slowly the lights don´t come on. If i foot the pedal a little bit more hard or more fast... the lights and pump turn on for a second or less. The car drives and brake perfetly although.

This is what i think:

-Could it be the pressure accumulator? Could it be a sensor? As anyone experienced this "strange" behavior on ATE mk1 ABS?´




Re: MK1 ABS problem

Posted: Tue Mar 23, 2010 9:10 pm
by glasgowjim
do you have a diagnostic box on the near side front wing cose to the battery next to the suspension.

What year of manufacture is it?

Re: MK1 ABS problem

Posted: Tue Mar 23, 2010 9:22 pm
by JP

I think not.. My is a MY90 , the first ones.
Thanks for your help

Re: MK1 ABS problem

Posted: Tue May 11, 2010 10:08 pm
by felyx
disconnect the sensors and put them on a multimeter to find if it has the CORRECT ohms in resistance is a plan , they also can get very dirty even though they are elctromagnetic , it cured it for me a few times

Re: MK1 ABS problem

Posted: Tue Jun 08, 2010 10:06 pm
by Melvin480
I hope this problem is already solved, but otherwise:

When I had problems with my '89 turbo's ABS, this what I experienced.

Purely ABS problems: only (ABS) light turned on.

Brakefluid problems: (!) and (ABS) light turned on.

When there is a problem with the brake fluid level (too low OR too high) it causes the (!) light to turnes on. When this light is on, the (ABS) light turnes on too. How is the level of the brake fluid? I got the (!) and (ABS) light turning on too when the level of brake fluid wasn't in the correct range.

Re: MK1 ABS problem

Posted: Fri Oct 31, 2014 11:28 pm
by Flying Dutchman
How did you solve it?

Re: MK1 ABS problem

Posted: Sat Nov 01, 2014 9:12 am
by glasgowjim
He adjusted the brake fluid level

Re: MK1 ABS problem

Posted: Sun Mar 01, 2015 6:51 pm
by balto8
So a too high brake liquid level alone can cause an ABS system failure?

I get (!) and (ABS) shortly lighted when I push the brake

Re: MK1 ABS problem

Posted: Sun Mar 01, 2015 10:12 pm
by gsa60
On mine, when I had this issue,I had to replace the whole unit.
Master cylinder was leaking.

Re: MK1 ABS problem

Posted: Mon Oct 26, 2015 11:44 am
by balto8
After changing the whole ABS Mk1 unit (250€) my car wouldn't still brake, the pedal was hard like stone. I have just changed ABS relays. Position J and K in the relay box. Both (ABS) and (!) lights off and the car breaking like new.

On my 1991 turbo theese relays were Wehrle 20 210 006 and 20 211 000. Replaced with Nagares RLPAS/52-12 and RLPAS/4-12 relays.

Now looking to replace all the aircon relays.

Hope this helps.