ABS modulator problem

[MylesC]

My '99 Disco has a shuttle valve fault in the ABS modulator. Solution? Replace the unit as it is not a servicable part!!! And the cost? The first estimate I have been given is around a third of the current value of my truck!!! If your ABS, HDC fault and TC warning lights come on permanently, then you are likely to end up with the same diagnosis and fix I'm confronted with. Seems almost worthwhile wrecking the vehicle and selling off the parts at this rate!!! Anyone out there with some advice?

[Bytemrk]

Hi MylesC,

Series 1 or Series 2 Disco? Did you get the price from a dealer or someone else and what sort of money have you been quoted :?:

I don't know of anyone to point you to in Qld ( but I'm sure someone here should... )

Down here is melbourne I would be looking to some of the companies that do service work and wrecking like AMV or Rangie Spares... must be someone up there that can get you a "reasonable" quote.... or at least I hope so.. 8O

Hope you get some help... there are plenty of switched on folk around here....someone should be able to point you in the right direction if you give them enough info..

good luck..... :roll:

[RichardK]

Hi MylesC,
Took this off the internet some time ago it does show that they can be pulled apart it's only the fear factor that holds us back.
This may not solve your problem but if you can isolate the shuttle valve as a part you may be able to do some research to find the manufacturer (WABCO?) and aproach them via the internet (it is global!) to see if there are parts available, afterall it had to be an item to be installed in the whole assembly.
Hope this helps
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ABS Servicing

Before you give up on that ABS pump you can clean it up and get it back to working fine with a little elbow grease.

Take the pump off (I can give you directions if you need it), then split the motor from the cast aluminum housing where the bleeders and brake lines go to it.

Inside there is a little ring with some bars, the ring spins around a post and then there's this funky little flat round piece with a slot in it that the motor uses to spin around.

Old crappy brake fluid leaves a film that is very thin but difficult to remove all over everything. Basically what the film is doing is causing the impeller to quit spinning around and your motor is starting to whine.

If you take all of that stuff apart, clean it in the most caustic stuff you can get your hands on taking very good measures to clean it out of every nook and cranny, you can reassemble the whole thing and you'll be back in business.

I've done this procedure about 10 times and can walk you thru it if you need me to. It's really not that difficult, just a little intimidating taking the pump out and cracking it open.

I have some non-ABS stuff, but am waiting for the day that my system REALLY goes out.

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[RichardK]

Here's another site that may be of assistance with lots of pictures

http://www.jpurnell.com/rr/repairs/abs_pump.htm

[MylesC]

My truck is a '99 Series 2 TD5 auto with ACE and SLS. I am still talking to a LR dealer about a sensible price for a fix using new parts. If I cannot achieve a sensible outcome on this front I will source a secondhand unit from a wrecker and have that fitted. All up this way it will end up costing under $1K instead of the nine times that as the original estimate!

And, thanks for the suggestions and leads you all have given. I'll certainly keep you posted on the final outcome.

[Lance]

Hi Myles try British Offroad at Forest Glen On the Sunshine Coast they maybe able to help they seem OK Lance

[Bytemrk]

<div class='quotetop'>QUOTE</div><div class='quotemain'> All up this way it will end up costing under $1K instead of the nine times that as the original estimate!
[/b][/quote] 8O 8O 8O

Holy Crap!!! 9 Grand!!!... that's an engine rebuild - not a brake problem!!

Good to see some of the fine folk of this establishment have some helpfull suggestions..

Hope you manage to winch the LR dealer back to reality!! :?




mental note to self...... "Be nice to your ABS"...... :roll:

[MylesC]

Lance, I checked out the mob at Forest Glenn and they can source one for me at a reasonable price should my negotiations with LR end in a shouting match.

[MylesC]

Just bringing this to the top again as there seems to be someone else with this or a similar problem.

[Rosco]

Try FWD Motors at Yeerongpilly 3848 9323

[MylesC]

Seems I did not post the fact on this site that I had achieved a satisfactory outcome on the replacement of the offending ABS modulator with some reasonable assistance from LR. Sorry about that. I discovered I had posted a report to another site yet forgot my Australian colleagues...please forgive....And, thanks to all for assistance given.

[Johnh]

Hi

Came upon this old post because I was searching around for a resolution to my problem

Test book tells me that it is a shuttle valve fault in the ABS modulator. so a couple of questions

1. Does the fix emntioned here fix at shuttle valve fault.

And if I take my ABS modulator out, how do I go about bleeding the lines when I replace it. I've been told that you need the test book to instruct the modulator to pump the fluid through.

Can anyone enlighten me?

Thanks

[defute]

Hi John,

if the ABS system on your Disco 2 has logged a 'shuttle valve' fault (11.4) there are few possible casues -

1. ABS modulator internal fault on the shuttle valve switch circuit,
2. wiring fault between the ABS modulator and the SLABS ECU,
3. SLABS ECU internal fault,

Generally the ABS modulator is the root cause of this fault, but it is worth while having this confirmed by someone in the know, as these units are not cheap!!

If the ABS modulator is removed/replaced, the brake's hydraulic circuit needs to be bled using T4 or a similar diagnostic computer in order to electrically 'force open' the units internal valves to remove all the air.

Good luck.

Cheers,

MARCEL

[Johnh]

I have managed to purchase a second hand modulator ( 2004) for $500 which I thought was a pretty good price.

I'l fist attempt to fix my existing one. If ti works, great i'll sell my bought one, if not, I'll fit the new one.

The test book tells me a a valve failure, but the funny thing is that I often get the fault when I am standing still in the vehivle, like waitng at the light. The fault happens most often when it is wet, but most goes away when things are dry.

[antenna]

Hi guys...I now have the same fault on my Series II V8. First port of call to LR came up with quote of $5,000+. This not only seems ridiculous, but as stated before, makes up for about 20% of my Disco's value. Dealer says 2nd hand is a risk as this is a "known" fault which LR UK ahave published a circular on and it may return.

My question is this..to the guys that replaced the Modulator with a 2nd hand unit....have you found the problem fixed, or as LR told me, has it retutned shortly after.


Thanks guys

[DEFENDERZOOK]

Originally posted by Johnh
I have managed to purchase a second hand modulator ( 2004) for $500 which I thought was a pretty good price.

I'l fist attempt to fix my existing one. If ti works, great i'll sell my bought one, if not, I'll fit the new one.

The test book tells me a a valve failure, but the funny thing is that I often get the fault when I am standing still in the vehivle, like waitng at the light. The fault happens most often when it is wet, but most goes away when things are dry.


<span style="color:green">
i had a holden combo which threw up a check engine light when it rained and it lasted for a few days after the rain....

never bothered to look for the problem but was probably just a sensor getting wet and altering its readings to the engine management system....

when your light comes on again, park somewhere out of the rain and pop your bonnet to see if any connectors or components are wet around the brake unit or inside the vehicle from a water leak into the cabin....
water will alter the readings by giving a higher or lower resistance than the computer is looking for and giving a fault.....</span>

[Frenchie]

Originally posted by antenna
Hi guys...I now have the same fault on my Series II V8. First port of call to LR came up with quote of $5,000+. This not only seems ridiculous, but as stated before, makes up for about 20% of my Disco's value. Dealer says 2nd hand is a risk as this is a "known" fault which LR UK ahave published a circular on and it may return.



If this is a "known" fault then LR should replace all affected parts free of charge.



Fat chance. :roll:

[JohnE]

Please excuse my ignorance, but on two occassions in this post has the price of "dealer' repairs to modulators been mentioned one was for 5k the other for 9k.
Am I to assume this small component of the car has a value greater than or equal to an engine.
I think it is a case of the dealers sticking it to the customers.
Does a replacement ford modulator cost that much? Is the ford modulator the same as the L/R one.

Perhaps someone knows.

john

[Johnh]

I know that second hand is a risk, but the cost of a newbie is just stupid.

I've got a 2004 model comming in the mail and I've heard that the 2003/2004 modulators are OK

My question is, IF lR are acknowldging there is a problem, then why don't they fix it, Surely a broke fault is a saftey fault and warrants a recall??

[DiscoStew]

This doesn't help answer anyone questions but I also had this problem occur in a 00 Disco TD5, about two weeks after buying it in April this year. Thank God is was still under statuatory warranty. I am now wondering if that is why the previous owner sold it! It was intermittent so the dealer may have hoped it would not happen.

But i can confirm similar symptons. More often in wet but sometimes also in dry. Could be driving or could be standing still. No pattern detected.

Took them very a short time to fix once the computer told them what it was (only a few hours) but it took three trips in to get the diagnosis.

Cheers
Paul