ABS Fault

Gaz
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ABS Fault Jan 23, 2014 9:49:11 GMT 1 via mobile

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Post by Gaz on Jan 23, 2014 9:49:11 GMT 1

I few months back I was testing a rover 25/45 can't remember which. When applying the brakes on the rear the ABS started to kick in. I still got over 100kg on each wheel and got an overall pass on the efficiency/imbalance.

I failed it for the ABS kicking in originally but on the retest after speaking to the mechanic I decided to do a decel test which it passed. The light never came on and there were no stored faults with the ABS system. The ABS kicked in normally when driving.

Just wondered your thoughts on this?

Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes
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David Administrator Owner\Director, AE\NT\SM, DVSA VTS Council Member, Registered Member & Administrator of The MOT Testers & AE's Forum If the facts don't fit the theory, change the facts. Albert Einstein Posts: 6,715 Class tested: 4 Last Online: Apr 29, 2024 14:14:04 GMT 1 Likes: 963	ABS Fault Jan 23, 2014 10:25:58 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by David on Jan 23, 2014 10:25:58 GMT 1 I only fail ABS for light indicating a fault, missing component,damaged, bad repair or faulty switch Gaz or stays on. Not sure it's faulty if it kicks in mate, that shows it's working during wheel slip normally.
	Last Edit: Jan 23, 2014 10:27:28 GMT 1 by David - It’s not that I’m so smart, it’s just that I stay with problems longer. —Albert Einstein

Gaz VTS Council member Posts: 2,157 Class tested: 4, 7 Last Online: Sept 7, 2019 10:16:48 GMT 1 Likes: 738	ABS Fault Jan 23, 2014 13:40:28 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Gaz on Jan 23, 2014 13:40:28 GMT 1 Why would it kick in at roller speeds if it wasn't faulty? It shouldn't be active at those speeds surely. It was only the offside rear if I remember correctly the other side was fine.
	Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes www.m32guy.co.uk - info@m32guy.co.uk

tim MOT tester Posts: 108 Class tested: 4 Last Online: Oct 2, 2023 16:01:51 GMT 1 Likes: 69	ABS Fault Jan 23, 2014 14:51:44 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by tim on Jan 23, 2014 14:51:44 GMT 1 Jan 23, 2014 9:49:11 GMT 1 Gaz said: I failed it for the ABS kicking in Out of curiosity.....what RFR did you use ?

billyloadsamud MOT tester Posts: 230 Class tested: 4 Last Online: Apr 25, 2016 11:56:35 GMT 1 Likes: 79	ABS Fault Jan 23, 2014 19:44:40 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by billyloadsamud on Jan 23, 2014 19:44:40 GMT 1 These rovers often do this at slow speeds when an ABS ring is cracked, felt through pedal, but ABS light does not show

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ABS Fault Jan 23, 2014 19:57:25 GMT 1

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Post by davidg on Jan 23, 2014 19:57:25 GMT 1

Jan 23, 2014 14:51:44 GMT 1 tim said:

Jan 23, 2014 9:49:11 GMT 1 Gaz said:

I failed it for the ABS kicking in

Out of curiosity.....what RFR did you use ?

I could be wrong but, the only one I can think of that he could have used is the "Excessive fluctuation" one.

Gaz VTS Council member Posts: 2,157 Class tested: 4, 7 Last Online: Sept 7, 2019 10:16:48 GMT 1 Likes: 738	ABS Fault Jan 23, 2014 20:16:51 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Gaz on Jan 23, 2014 20:16:51 GMT 1 tim, as the abs was kicking in it started fluctuating heavily on one side (offside I think) Good guess davidg
	Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes www.m32guy.co.uk - info@m32guy.co.uk

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ABS Fault Jan 23, 2014 21:07:58 GMT 1

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Post by davidg on Jan 23, 2014 21:07:58 GMT 1

Interesting how VOSA advised us that brake judder had been removed from the mot test criterion, then they use brake efforts to assess excessive fluctuation in each wheel revolution, in it's place, which is technically still brake judder, but we could now call it brake force fluctuations, torque fluctuations, booming judder, thermal judder, cold judder...........

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ABS Fault Jan 23, 2014 23:27:41 GMT 1

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Post by phaetonott on Jan 23, 2014 23:27:41 GMT 1

I seem to remember something Audi I tested that said on the VSI that ABS might operate during a roller test, and if that happened, you should test with the ignition off, and re-start the engine to recharge the servo if necessary. Maybe that would work on the Rover

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Gaz VTS Council member Posts: 2,157 Class tested: 4, 7 Last Online: Sept 7, 2019 10:16:48 GMT 1 Likes: 738	ABS Fault Jan 23, 2014 23:43:44 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Gaz on Jan 23, 2014 23:43:44 GMT 1 That rings a bell phaetonott, although there was nothing like that stated on the VSI for the rover.
	Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes www.m32guy.co.uk - info@m32guy.co.uk

David
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ABS Fault Jan 23, 2014 23:52:47 GMT 1

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Post by David on Jan 23, 2014 23:52:47 GMT 1

Jan 23, 2014 9:49:11 GMT 1 Gaz said:

I few months back I was testing a rover 25/45 can't remember which. When applying the brakes on the rear the ABS started to kick in. I still got over 100kg on each wheel and got an overall pass on the efficiency/imbalance.

I failed it for the ABS kicking in originally but on the retest after speaking to the mechanic I decided to do a decel test which it passed. The light never came on and there were no stored faults with the ABS system. The ABS kicked in normally when driving.

Just wondered your thoughts on this?[

Jan 23, 2014 9:49:11 GMT 1 Gaz said:

I still got over 100kg on each wheel and got an overall pass on the efficiency/imbalance.

, ruled that Failure out and mistakenly assumed that

Jan 23, 2014 9:49:11 GMT 1 Gaz said:

I failed it for the ABS kicking in originally

, meant you'd failed the ABS.

Correct to use excessive fluctuation in each wheel revolution.

It’s not that I’m so smart, it’s just that I stay with problems longer.
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Post by Gaz on Jan 23, 2014 9:49:11 GMT 1

Post by David on Jan 23, 2014 10:25:58 GMT 1

Post by Gaz on Jan 23, 2014 13:40:28 GMT 1

Post by tim on Jan 23, 2014 14:51:44 GMT 1

Post by billyloadsamud on Jan 23, 2014 19:44:40 GMT 1

Post by davidg on Jan 23, 2014 19:57:25 GMT 1

Post by Gaz on Jan 23, 2014 20:16:51 GMT 1

Post by davidg on Jan 23, 2014 21:07:58 GMT 1

Post by phaetonott on Jan 23, 2014 23:27:41 GMT 1

Post by Gaz on Jan 23, 2014 23:43:44 GMT 1

Post by David on Jan 23, 2014 23:52:47 GMT 1