Brake Disc Skimmimng |
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Normski
Senior Member Joined: 28 Jan 2015 Location: Devon Status: Offline Points: 110 |
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They are cast for big block Tonti, T3-SP etc, two I need doing were in fact brand new but showed a wear pattern which looked similar to a dart board (the pattern followed the oval holes in the disc) with very little use, seems they were got too hot when machined during manufacture? After a lot of going and froing with the supplying dealer we agreed to me keeping them at a discount. Not too keen to buy new again😎
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Modern discs have the minimum thickness stamped on them but it`s only a guide as different vehicle manufacturers have their own limits. The likes of Mercedes, BMW etc. use mileage and time to replace discs whatever their condition.
At my local MOT station he told me of a Mercedes C class that had passed its test with no problems but was returned 3 weeks later after the owner asked for a second opinion after the main dealer said that all discs and pads needed replacing! The MOT tester confirmed that all discs and pads were in good serviceable condition and well within limits. He contacted the dealer only to be told that it was a Mercedes service item because of the mileage covered. So this `gentle` elderly driver was classed the same as a `hard` braker CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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That's just the car manufacturer and dealer covering themselves, and making money of course.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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The dealer inferred that the MOT was not right and that it was a safety issue, apart from the over £1000 quotation
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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red leader one
Senior Member Joined: 07 Oct 2014 Location: Cullercoats Status: Offline Points: 4466 |
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I don't think I'll be buying my S Class now knowing that.
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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I didn`t think a man of your calibre would want to trade down anyway CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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GUZZIPETE
Senior Member Joined: 29 Jul 2016 Location: Devon Status: Offline Points: 198 |
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Cast iron discs from the earlier bikes skim on the lathe quite readily.
Stainless discs are a different matter, and a lot would depend on the grade of stainless. But I suspect grinding would be preferable, if not crucial. I have not tried it. On the cast discs, if there is enough thickness left to be able to take a 'minimum-to-clean' amount off without going undersize, which could be as little as say 5-10 thou, it can be a simple task and worth doing if they have become 'furrowed' over time, especially when fitting some new pads. I have skimmed a couple on my bikes over the last few years without issue. Unfortunately the lathe won't quite take a 300mm disc though. I've found that skimming new brake shoes whilst on the carrier is also beneficial, and gives a much larger contact area on the drum. Again, it doesn't need a lot to take off.
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1971 Moto Guzzi V7 Special
1974 Laverda 750 SF2 1979 Laverda 3CL |
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theone&onlymin
Senior Member Joined: 14 May 2014 Location: United Kingdom Status: Offline Points: 2072 |
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Gianni
Senior Member Joined: 16 May 2014 Location: Muswell Hill Status: Offline Points: 676 |
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Mmmmm brakey.
Did they do them while you waited Min? I have one or two in need of attention.
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Le Mans 1, Spada, Cali 1, T3 Mongrel, Le Mans V, Quota x 2, Stelvio TT
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theone&onlymin
Senior Member Joined: 14 May 2014 Location: United Kingdom Status: Offline Points: 2072 |
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No he doesn't, I can drop them down for you next week as I'll be passing by, you can pick them up a couple of days later, so it's sort of while you wait except you won't have to wait.
Cheers Min
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Gianni
Senior Member Joined: 16 May 2014 Location: Muswell Hill Status: Offline Points: 676 |
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Thanks for the kind offer Min but they are still attached to the bike ATM - just setting myself up for the future
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Le Mans 1, Spada, Cali 1, T3 Mongrel, Le Mans V, Quota x 2, Stelvio TT
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theone&onlymin
Senior Member Joined: 14 May 2014 Location: United Kingdom Status: Offline Points: 2072 |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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You won't be able to use that in the wet now, they might get rusty.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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theone&onlymin
Senior Member Joined: 14 May 2014 Location: United Kingdom Status: Offline Points: 2072 |
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iceni
Senior Member Joined: 16 Sep 2014 Location: Colchester Status: Offline Points: 2480 |
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For the solution, please refer to my post of April 1st 2021!
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