kevin
Mechanic / Technician
Posts: 4
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Post by kevin on Jun 9, 2007 15:32:42 GMT
How much corrosion is acceptable on a rear disc is there any measurements or guidelines you can give before i present the car for test. Alternativley how do you post pics on the site? Kevin
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Post by Admin on Jun 9, 2007 21:52:39 GMT
A brake disc has to be 'excessively pitted' to fail the MOT test. ( RfR's: A brake disc or drum insecure, cracked or excessively scored, pitted or worn ) A thread on posting images can be found here: " help posting photo needed" If you do not have a photobucket account - or not sure how to set one up, then you may email the picture to me & I will post it for you. My email link can be found by clicking the envelope icon in the box to the left of this message. Reason for edit: Corrected RfR's
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zander
Nominated Tester
Posts: 7
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Post by zander on Jun 9, 2007 21:59:04 GMT
Hello kevin corrosion its self is not a reason for failure.If the brake disc is badly pitted then this is a fail.However,if the disc has excessive corrosion then this may give poor brake readings on the roller brake tester or an oval brake reading which would be a fail. Provided the disc is not worn to excesse or groved i just pass and advise on corrosion.
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Post by Admin on Jun 10, 2007 21:58:18 GMT
Here's the photos of Kevin's discs:
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NT
Nominated Tester
Posts: 139
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Post by NT on Jun 11, 2007 18:32:31 GMT
I would pass & advise on the condition of the discs, from what I can see in the pic.
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Post by Dave Hill on Jun 11, 2007 19:47:20 GMT
There was a similar thread on this topic a while back. The discs looked about the same as those. The difference in opinion from testers about a pass or fail was staggering. www.bba-reman.com/forums/Topic18274-2-1.aspxCheers Dave (Hill)
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kevin
Mechanic / Technician
Posts: 4
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Post by kevin on Jun 11, 2007 20:23:49 GMT
So what are the actual guide lines you work to? Kevin
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Post by Admin on Jun 11, 2007 21:16:36 GMT
So what are the actual guide lines you work to? Kevin This: Reason for Rejection: A brake disc or drum insecure, cracked or excessively scored, pitted or worn Visit this link for an online version of the brake section of the testers manual: www.motuk.co.uk/manual_350.htmThe condition of the brake disc can be found at sub-paragraph 'h' The main index to the tester manual is at: www.motuk.co.uk/manual/contents.htmNOTE: The manual linked to in the above is slightly out of date. Although most Methods of Testing and Reasons for Rejection still apply, the definitive text is in the latest version of the MOT test that is found on the VTS Device.
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Post by Admin on Jun 11, 2007 21:21:16 GMT
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kevin
Mechanic / Technician
Posts: 4
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Post by kevin on Jun 11, 2007 23:24:34 GMT
Right thanks for the comments guys the full story with the disc's is the car failed MOT on sat on the following items n/s wiper blade deteriorated n/s/r disc excessivley pitted scored o/s/r disc excessivley pitted scored n/s/r pads below 1.5mm Now i am a HGV mechanic and prepare and take commercials for test on a daily basis but am not 100% up on car regs so wanted a unbiased opinion (i.e. you didn't know it had been failed) before posting the full story. The vehicle in question is a Honda accord and covers a grand total of 4000/4500 miles a year hence the corrosion problems through lack of use. Failure item one the wiper blade had a minimal amount of damage 5-6mm at the very bottom of the blade which did not in anyway effect the clearing of the screen after the test this had developed into a 1inch tear in this area Failure items two and three the disc's i was not sure of the regs hence this post but the car did pass all tests on the rollers without any issues what so ever. Efficiencies bind inbalance where all fine Failure item four pads less than 1.5mm is 100% B. S. All wheels where removed and pads checked prior and after the test. The pads/disc's on the rear are not 100% but bearing in mind the low milage this vehicle does certainly good for a good while yet. I questioned the tester at the time about his decision but he was adamant he would not change his mind. It now seems my only recoarse is to get VOSA involved.
Regards Kevin p.s the same garage last year said they where going to fail the same car on both rear tyres when challenged this suddendly it became an advisory item, upon removing the tyres for this test 4300 miles later they where still perfectly legal! Seems to be a pattern forming.
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addy
Nominated Tester
Posts: 76
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Post by addy on Jun 12, 2007 15:42:22 GMT
Why go back after last year??
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kevin
Mechanic / Technician
Posts: 4
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Post by kevin on Jun 12, 2007 18:21:04 GMT
Gave them the benefit of the doubt and its the only place in the area that tests sat afternoon and sundays. Kevin
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Rob
Nominated Tester
Posts: 279
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Post by Rob on Jun 12, 2007 18:59:19 GMT
n/s wiper blade deteriorated n/s/r disc excessivley pitted scored o/s/r disc excessivley pitted scored n/s/r pads below 1.5mm I would say that they were pitted, but excessively, not from what I can see and they certainly don't look scored at all. If they were that bad they probably would have showed some problems on the brake roller test. As far as the brake pads are concerned, I've been told by several VOSA staff that you should only fail brake pads if you're convinced they would be under 1.5mm if measured or if it's plainly obvious they are worn to excess. Windscreen wiper deteriorated? There's no such failure criteria in the Tester's manual. All it says is that it should:- I was told by a senior trainer during my refresher course last year that the failure in the VTS device of "windscreen wiper deteriorated" is not a real reason for rejection and should have been removed. I would appeal if I were you.
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Tom
Nominated Tester
Posts: 227
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Post by Tom on Jun 13, 2007 22:48:12 GMT
Seems as though the NT had his 'Service head' on instead of his 'MOT tester head'...
Standards for servicing are of a higher level than that of the MOT test. Items have to be of a bare minimum standard for the MOT, but not-as-badly worn, etc to warrant replacement at a service.
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Post by ammer1t on Jul 8, 2007 9:42:36 GMT
Hi all ,not been on for a good while and just browsing posts . To Kevin, it may be you will have invalidated any claim by removing wheels ,did you also remove pads ? .the argument from tester may be you changed pads ! ,silly I know but it can happen . My own thoughts on disc wear would be if pad is not braking across at least 50% of it's width it should fail but maybe that would be to easy . regards Paul
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miket
Nominated Tester
Posts: 7
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Post by miket on Mar 12, 2008 23:29:26 GMT
from a tester point of view .. the discs look in poor condition yes, however the question in my mind after a brake roller test would be .. would this vehicles brakes be considerably improved by replacing the discs , if not pass and advise.
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