ABS problem after changing wheel bearing

[plod]

I have a 99 HDI 110 that I had to have some work on for the MOT

The garage next door to work changed the nearside horizontal suspension link, put new shoes in for the handbrake, new copper and flexi brake hoses for the nearside rear, and on the same side fitted a rear hub assembly.
The rear hub assmebly I got from the local motor factors and is a Quinton Hazall product.

I had no issues with the brakes before the work, but since, when I drive the car, the first time I touch the brakes, the pedal is all hard and high up, and then judders down ( i guess the abs working) until it reaches its normal position and then is fine. When I first start the car, there is no warning lights, but usually within a minute or two the ABS light comes on.

Normally after this first use of the brakes, they are fine, as I don't tend to do the miles I used to, but on a 190 mile journey the other day, I did about 140 miles and when I touched the brake, it had the same feelingdescribed above.

The guy who did the work, said he thoroughly cleaned out any brake dust with an air line before reassembly, as i've heard sometimes a bit of dirt can upset the sytem if it gets in there but he's adamant it's not that.

I believe the 406 has a fixed air gap for the ABS so you can't adjust?
Anybody any ideas what the problem could be?
Could there be a problem with the castleations on the back of the hub possibly being imperfect and upsetting the system?

I need to change the wheel bearing on the other side also, and don't want to do that before i've cured this fault first.
I'm tempted to get a genuine part to put onto this side to see if it cures it, or try the local bearing place down the road to see if they can supply the correct bearings to put into my old hub? Money is tight at mo, so could do without having to bin the pattern part to get the genuine articles, but if that's the answer.

Any help most appreciated

[jasper5]

Firstly, did the hub that was fitted have the same number of teeth (slots) as the old one? There are two different sizes of ABS ring on these rear hubs.

There is a possibility that the sensor got damaged in the course of the work.

The garage should not have blown out the dust with an air line....very bad for their health.

Is the brake disc damaged or worn in any way? (Warped)....A brake test on a MOT brake tester would check the disc for warping.

[steve_earwig]

That was my first thought, the earlier hub has 29 "castellations", the later has 48 (also available without but no-one's that daft). As yours is a '99 it's in the middle of the change so it'd be an easy mistake to make if the mechanic fitting it wasn't paying attention.

Presumably the abs light comes on once the car's moving..? Why doesn't it revert to normal brakes tho?

Would a seriously warped disk bring up an abs fault light?

[jasper5]

A warped disc should have shown up on the mot brake test, so, it was probably ok, as it didn't fail on that.

I was just considering options, and yes, I think the ABS light would come on with a badly warped disc.

[mjb]

Would a seriously warped disk bring up an abs fault light?

Not on a D8 where all occupants in the car can feel even the slightest application of the brakes...

[plod]

The Mechanic used to own my car, he's a good mate of mine and know he would of said if the disc was warped.
Plus you'd feel it under braking.
I'm pretty sure the castleations are the same but will double check.

[plod]

If the backplate was going rusty, would this have any effect on the ABS????????

Other side desperate now, but struggled for funds, but going to have to take plunge

I take it stealers are prohibitively expensive, so is there any of the aftermarket suppliers more favourable than others??

[steve_earwig]

My D8's backplates look like tea bags but no ABS issues.

Other side of what? Aftermarket suppliers? What's going on?

[plod]

Still got the issues with my ABS as originally described in first post, and initially I wanted to solve this problem before sorting out the other wheel bearing which is on it's way out, but this is now what i'm referring to as "the other side" as feels like it could fail anytime.

I ain't got the funds to go to the stealer as bet it will be over a ton, so wanted to know if any of the aftermarket wheel hubs are of a better quality than the others. The one I fitted to the passenger side, and then started to have ABS issues was a Quinton Hazell part.

[steve_earwig]

I'm still amazed you've got hub issues, it seems a very rare occurrence and you've even got two... I was never keen on QH stuff but I'm told these days it's all more-or-less the same thing just in a different box. Even OE...

Did you check the teeth/castellations?

If you're driving the car best get the bearing sorted, you can driver forever with no abs (hey, I managed for almost 20 years!) but the bearing might give you real trouble...

[jasper5]

I was always wary of QH stuff as well, but the recent stuff I've bought have been Valeo parts in the QH boxes, the last 2 clutches were anyway.

[plod]

Right, looks like I got it sorted

Still had the old hub that was taken off, and had it in the QH box that the new one came in.

Old hub has 29 castleations. I took the part number from the QH box - QWB1050 and went to the motor factors I got the replacement from. Luckily my mate was serving, so got him to check the part numbers for me. Turns out I needed QWB1051 (29t) and not the QWB1050(48t), so obviously I have wrong hub fitted

He has ordered me two 29t hubs, and said he would see if he could refund me the price of the original one - fingers crossed

His system only had the 48t listed as being for a 99 car , and 29t for pre 99, so hence why I ended up with wrong part - normally he's pretty clued up, but guess in this instance the computer system let him down

My mechanic had a right nightmare getting the original hub off, and guess due to time, he just didn't check castleations as probably thought i'd got the right part anyway, but hey ho

Anyway, thanks for your assistance

[steve_earwig]

Glad you got it sorted, that's the joys of owning a car that was made "on the cusp" - my old Ashtray was like that, if I had a quid for every time I had to say "no, it's the earlier one" to the guy in Carspares...

[jasper5]

Glad you got it sorted in the end, but I did say there were 2 types, as I have previously in other threads on the subject.