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Discs ...

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Discs ...

PostPosted by Hoovie » Wed Aug 02, 2017 10:15 am

Ok, bit of advice requested here, probably from Don (Mr Brakes himself) and Uncle Bob (Mr MOT man), but anyone else feel free to chip in :s_howdy

My LT Minibus had its MOT in late May, and this was the list of Advisories:
Advisory notice item(s)
Nearside Front brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)
Offside Front brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)
Nearside Rear brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)
Offside Rear brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)

Seat belt flexible stalk damaged but not likely to lead to failure under load row 1 middle seat stalk cover missing (5.2.4a)
Seat belt flexible stalk damaged but not likely to lead to failure under load row 2 centre seat belt stalk cover missing (5.2.4a)
Seat belt flexible stalk damaged but not likely to lead to failure under load row 3 centre seat belt stalk cover missing (5.2.4a)

both n/s/r tyres side walls slightly perished
vehicle tested as class 5 no tax disc / operators disc /no section 19 displayed
seat belts with covers missing work fine

Now the items I highlighted in Green are irrelevent as the seats are being removed and the class is changing
The item in orange I am dealing with by changing ALL the tyres anyway (bit of a mismatch fitted, so renewing the lot)
But the Items in Red are ones that obviously need looking at :Y

So all the discs are "brake disc worn, pitted or scored, but not seriously weakened"!
but when I examined the discs this morning while all the wheels were off to get new tyres fitted, I looked at them pretty carefully and I reckon they seem pretty good :s_scratchhead I took some photos ... what do you think?

ImageLT-Disc 2 by David, on Flickr

ImageLT-Disc 1 by David, on Flickr

Seem to have little wear. There is no lip on the edge. The disc looks even and clean.
The above are pictures of just one disc (NSR), but they all look like this and non have a lip.
I am wondering if was just a matter of the vehicle having stood unused for a long period before the shortish drive to the MOT station, and now it has had a bit of use (only a few hundred miles though), the discs are all cleaned up?

Finally, just a question on the pads ...
This is the view though the caliper
ImageLT-Brake Pads by David, on Flickr
I have marked what I see as the usable pad area before the wear sensor will hit the disc. Presuming I have marked it correctly, what kind of life would be left on these? (they look really meaty to me and nearly new?)
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Re: Discs ...

PostPosted by Davrav » Wed Aug 02, 2017 10:20 am

Well, not being an expert of any kind, but those discs and pads look fine to me too. I'm guessing that the old bus had been standing around and the discs had got surface rust on them. Presumably you have been driving it around and they have now cleaned up.
Are the inner faces in similar condition? If so I would leave well alone.
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Re: Discs ...

PostPosted by CharlieFarlie » Wed Aug 02, 2017 10:30 am

Davrav wrote:Well, not being an expert of any kind, but those discs and pads look fine to me too. I'm guessing that the old bus had been standing around and the discs had got surface rust on them. Presumably you have been driving it around and they have now cleaned up.
Are the inner faces in similar condition? If so I would leave well alone.



Same here.

Some MOT testers can be pedantic. The main tester at DNA writes something on every test he does. Completely unnecessary and he has annoyed a few people I know so much they go elsewhere. Where incidentally they don't get written up.

The pictures indicate plenty of life yet. I bet if tested somewhere else it would not get written up.
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Re: Discs ...

PostPosted by Hoovie » Wed Aug 02, 2017 11:00 am

Thanks chaps :s_thumbsup

Brakes are such an important thing, I didn't want to assume anything so good to have the 2nd opinion :s_howdy Inside and out feel good, and the discs were nicely warm, so brakes are working well.

Charlie, when you say "writes something", you are referring to adding an advisory? That can indeed be really annoying when it is undeserved and I can see why people would go elsewhere. On the last but one MOT on my T5, the tester added an advisory "Rear Brake pad(s) wearing thin (3.5.1g)" and said it was borderline whether to mention or not. But I bought new Pads (and Discs) to swap over in the springtime.
Didn't get round to it by the time of the next MOT and the tester - done at the same garage, mind - gave me no advisories at all although pads never changed :s_scratchhead (I did mention I was intending selling and I think maybe he took that into account to make the ticket as clean as possible)
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Re: Discs ...

PostPosted by CharlieFarlie » Wed Aug 02, 2017 11:37 am

Hoovie wrote:Thanks chaps :s_thumbsup

Brakes are such an important thing, I didn't want to assume anything so good to have the 2nd opinion :s_howdy Inside and out feel good, and the discs were nicely warm, so brakes are working well.

Charlie, when you say "writes something", you are referring to adding an advisory? That can indeed be really annoying when it is undeserved and I can see why people would go elsewhere. On the last but one MOT on my T5, the tester added an advisory "Rear Brake pad(s) wearing thin (3.5.1g)" and said it was borderline whether to mention or not. But I bought new Pads (and Discs) to swap over in the springtime.
Didn't get round to it by the time of the next MOT and the tester - done at the same garage, mind - gave me no advisories at all although pads never changed :s_scratchhead (I did mention I was intending selling and I think maybe he took that into account to make the ticket as clean as possible)


Yes advisory. None of us likes them unless they are really necessary but often its just the pedantic tester that somehow needs to show his thing by writing them up.

It could be in some cases the garage is trying to drum up work but not in our case as I can never get things needing doing booked in unless for weeks in advance so plenty of work there ! Brakes are high profit jobs as garages make big old profits off the supply but as we all know we can buy quality kit for nowhere near what we would pay at the foot of an invoice.

To me they look way above average ! They look clean unmarked and not even corrosion on the unswept areas. There is a wee score on one of them but thats nothing and will likely wear away.

Young Donald is your man of course but I think from what I can see they are perfectly fine.
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Re: Discs ...

PostPosted by Hoovie » Wed Aug 02, 2017 11:49 am

TBH I was shocked by the state of the discs, but in a good way. Not seen discs that clean short of ones just fitted!
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Re: Discs ...

PostPosted by Uncle bob » Wed Aug 02, 2017 8:15 pm

Rather enthusiastic mot tester or he had given it a good look over as the vehicle was being sold on ....sort of covered his ass :s_thumbsup
I would note many advises on traders cars just so I was covered if later on a customer complained ....even though back then the new owner would never see the advise sheet :rolleyes:
Your discs look fine other than normal surface corrosion to the outer edges .
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Re: Discs ...

PostPosted by anchorman » Thu Aug 03, 2017 7:22 am

Sorry, was working late yesterday!

I agree with everything said above. Testers occasionally get audited and they seem to like demonstrating that they really have looked over the vehicle by commenting and if anyone like yourself were to dig in, you’d have difficulty proving that they weren’t pitted at the time of testing. Like Charlie says, brakes have often a loss leader effect only the very mention of the subject rather than price strikes fear into the heart of the owner. Providing the discs are all in a similar condition (as good) as the one shown above, I might be tempted to challenge them and say you’ve been to a brake specialist that can’t see what the issue is and see how they react. Those discs are also inboard of the hub which is not uncommon with commercials. There are a couple of reasons for doing it. One is to get the heat from braking away from the bearing and the other is to get the brake disc nearer to the centre line of the wheel which improves stability during braking (stops it pulling on the steering). The downside is that there is more labour than usual as the hub has to be removed and then the bearings should be re packed with grease etc etc.

I certainly wouldn’t worry about an advisory. My daughter has something pop up on a car some years ago. I challenged it (think it was some movement in a suspension bush or something) and because many of the test parameters are subjective, they said it would be OK. However, they had made a rod for their own back and the item then had to be repeated every year as they couldn’t all of a sudden consider it not worn and that happened for as long as we owned it. I think if I’d gone in and said “oh, I changed those bushes just after test last year” they would have taken it off.
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Re: Discs ...

PostPosted by Uncle bob » Thu Aug 03, 2017 11:03 am

H you've got another maybe 2 mm extra pad thickness ..as the sensor probe is a bit further back from the plastic housing ...


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Re: Discs ...

PostPosted by Hoovie » Thu Aug 03, 2017 12:36 pm

so the sensor is covered in plastic then? Handy.

I didn't look at the other pads in detail, so never noticed the pad warning sensors - I presume it will be just one of the inner pads on the rear and one of the inner pads on the front?
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