ABS but front wheel locks up

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c.morewood
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ABS but front wheel locks up

Post by c.morewood »

I cleaned and bled the brakes for the impending MOT retest but noticed during trying to bed the brake pads in again, that the n/s front will lock up under heavy braking. I have ABS and that shouldn't happen.. the ABS light goes out as normal on startup and doesn't reappear.. any ideas?
Chris
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DickieG
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Re: ABS but front wheel locks up

Post by DickieG »

Is this at very slow speed?
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c.morewood
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Re: ABS but front wheel locks up

Post by c.morewood »

From about 20-25mph Dickie..No Lexia faults either.
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
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Re: ABS but front wheel locks up

Post by Stickyfinger »

Sticking slide bolt or miss placed pads ?.both sides or one ?
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Re: ABS but front wheel locks up

Post by citroenxm »

Ive known of this problem.. tevis ecus are known to have some issues but not many..

But the car i had it on i didnt discover the issue till it was too late and id sold the car.

It can be either the ecu or valve block.. theres a bit of good news.. the ecu can be removed from the valve block on its own.. two bolts and a clip on the connector.. however the relay/engine fuse box is in the way of getting at the bolts for the ecu...
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c.morewood
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Re: ABS but front wheel locks up

Post by c.morewood »

Slide bolts were well greased today, not sure how you could misplace the pads other than putting them in at an angle and that would show up in uneven wear.. they looked fine today.
Hadn't heard about the ecu problem before, thanks Paul. I suppose there's no way of testing it other than replacing it? And the same with the valve block? Lexia certainly didn't show any faults, current or historical.
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
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Re: ABS but front wheel locks up

Post by chinkostu »

The little notch on the pad is lined up with the piston right? I misaligned mine and it make the brakes stick on
Stu

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citroenxm
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Re: ABS but front wheel locks up

Post by citroenxm »

Yes chris...

When your me though it dont cost any thing except time.. this could be your lucky night. I can send you a block and ecu if you want for you to try.. if it works you can then decide what its worth to you??

I won't be able to send anything now till next week. I wont be back to the farm to at least monday now after the northen rally..
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
citroenxm
Posts: 8061
Joined: 30 Dec 2004, 23:10
Location: Somewhere in North Wales, Anglesey
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L 94 XM 2.1 TD auto total resto

2008 Peugeot 207 Sw 1.6 16v hdi. 217k and rising
2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
x 70

Re: ABS but front wheel locks up

Post by citroenxm »

Lets have a think about this... why would it be pads??

If the wheel locks.. the drive shaft stops.. this then the ecu will detect.. what happens when an abs ecu kicks in? You feel a pulse and noise through the pedal! Im sure chris would feel this if the abs was working correctly.

So no. I dont think chris needs to even consider pads.. its a valve block or ecu problem. And cant be a senor problem because A they pass the resistance test .. b if they were too far away from the cv joint teeth the light would show
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
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DickieG
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Re: ABS but front wheel locks up

Post by DickieG »

If you have access to Lexia or other diagnostic equipment it'd be worthwhile observing the speed detected by each of the wheel sensors whilst the car is being driven as a starting point.
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c.morewood
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Joined: 05 Nov 2004, 14:38
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'98 Xantia 1.9TD SX Estate 150K Sold "T"
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Re: ABS but front wheel locks up

Post by c.morewood »

Yes please Paul, When you can .. I have till the 10th till the MOT runs out.. but have a retest on Thu. I'm in the dark with ABS as I've never had problems apart from the sensors.
I'll give the Lexia another go tomorrow and observe the speeds.
Thanks for all the advice.
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
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chinkostu
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Re: ABS but front wheel locks up

Post by chinkostu »

The question is, did the ABS work properly beforehand?

The reason i mentioned the pads is because i buggered mine and they locked on, hard. So the abs could be kicking in but the piston can't retract as the pads jammed
Stu

Cars
1995 Xantia 1.9TD SX in (faded) Red
2003 Fiesta 1.4 Zetec in GREEEEEEEN
2001 206 1.9 LX
2001 Saxo VTR
1999 Saxo 1.1 East coast
1999 Punto :oops:
1996 306 1.8 XN Auto :?
1996 Fiesta 1.3 #-o
c.morewood
Donor 2023
Posts: 1041
Joined: 05 Nov 2004, 14:38
Location: Kemnay, Nr Aberdeen, United Kingdom
My Cars: '00 Xantia 110 bhp Hdi SX Estate 65K "W"
'99 Xantia 110 bhp Hdi SX Estate 310K SORN "V"
'98 Xantia 1.9TD SX Estate 150K Sold "T"
x 47

Re: ABS but front wheel locks up

Post by c.morewood »

I'm pretty sure it was working earlier in the year when it snowed for a couple of days.. I had an ABS fault caused by a sensor due to rust in the reluctor ring back in Feb.. no probs since then.
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
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Stickyfinger
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SAXO White Mk1. Sally
x 1280
Contact:

Re: ABS but front wheel locks up

Post by Stickyfinger »

Handbrake cable incorrectly adjusted resulting in tighter pull one side ?.......just plucking out easy things to check
Alasdair
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c.morewood
Donor 2023
Posts: 1041
Joined: 05 Nov 2004, 14:38
Location: Kemnay, Nr Aberdeen, United Kingdom
My Cars: '00 Xantia 110 bhp Hdi SX Estate 65K "W"
'99 Xantia 110 bhp Hdi SX Estate 310K SORN "V"
'98 Xantia 1.9TD SX Estate 150K Sold "T"
x 47

Re: ABS but front wheel locks up

Post by c.morewood »

Nope did that yesterday as well.. there new Mot's are a bugger they find every little fault as I'm sure a lot of you will find out as the new rolling and vibrating computerised test beds are introduced.
Anyway I don't think any handbrake imbalance wouldn't stop the ABS from working..
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
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