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Thread: Q2 Rear Brake Discs Rusting

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  1. Re: Q2 Rear Brake Discs Rusting 
    #11
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    Quote Originally Posted by vwcabriolet1971 View Post
    Of course the wheels need to be removed to use the measuring instruments which most dealers can't be bothered to do.
    Indi’s and dealers alike would probably be quite happy to take the wheels off during a service, the problem is the VAG schedule does not allow the hour it takes to remove four corroded on wheels that have not been off in at least two years, then clean the bell and wheel faces with a wire wheel, paste up the faces, clean and paste the bolts and then refit the wheels, drop it on the deck and double torque check 20 bolts to the specified torque, one of a grease monkeys greatest fears is a wheel coming off so if you don’t remove it, that is unlikely to happen and when the service sheet asks for a visual indication of pad wear, are you going to take an hour to check something you don’t get paid for but have to accept all the risks? That hour does not included the twenty minutes trying to find the wheel bolt key under layers of crap in the load area. On top of that, try telling the average customer it has cost them £70>£120 to have the wheels removed and re-fitted, have you ever had a customer spit feathers with incredulity over the cost of a task they don’t understand?
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  2. Re: Q2 Rear Brake Discs Rusting 
    #12
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    Quote Originally Posted by Crasher View Post
    Indi’s and dealers alike would probably be quite happy to take the wheels off during a service, the problem is the VAG schedule does not allow the hour it takes to remove four corroded on wheels that have not been off in at least two years, then clean the bell and wheel faces with a wire wheel, paste up the faces, clean and paste the bolts and then refit the wheels, drop it on the deck and double torque check 20 bolts to the specified torque, one of a grease monkeys greatest fears is a wheel coming off so if you don’t remove it, that is unlikely to happen and when the service sheet asks for a visual indication of pad wear, are you going to take an hour to check something you don’t get paid for but have to accept all the risks? That hour does not included the twenty minutes trying to find the wheel bolt key under layers of crap in the load area. On top of that, try telling the average customer it has cost them £70>£120 to have the wheels removed and re-fitted, have you ever had a customer spit feathers with incredulity over the cost of a task they don’t understand?
    Its not the first time I've been laid on my side under the back of a car kicking, and then resorting to hammer a wheel off the rear of a car. 1 wheel took about half hour. I fully understand your comment above Crasher.
    To be fair you can probably get a set of callipers or micrometre over a disc if not through the wheel then from behind the wheel especially up on ramps removing the need to take wheel off.
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  3. Re: Q2 Rear Brake Discs Rusting 
    #13
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    With most modern wheels you can check the outer pad and disc face in seconds, Many modern VAG rear back plates make it impossible to check the inside face of the rear discs, even WITH the wheel off and as for rear bleed nipple access....
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  4. Re: Q2 Rear Brake Discs Rusting 
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    Some disc manufactures used to M/C flat bottomed holes in the disc faces to indicate the limit of disc wear. These were not balancing holes ( balancing is done by M/Cing in the middle of the disc periphery).
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  5. Re: Q2 Rear Brake Discs Rusting 
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    Hi
    I wonder if you have come up with any more info. It sounds as though you might have a working knowledge and connection with Audi or VAG?
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  6. Re: Q2 Rear Brake Discs Rusting 
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    There are commercial disc thickness measuring ( digital) calipers specially designed to get into the limited space between most brake caliper and the discs. In the case in question in would only need one rear wheel removal to gain the necessary access.
    Its a shame that most garages (& dealerships ) don't have brake skimming in-situ lathes. These M/Cs can skim discs ( both sides) on the vehicle obviating the need for new discs in a lot of cases. Almost all American brake Specialists ( brake & clutch outlets) have these M/cs. Our garages would sooner sell you new discs.
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  7. Re: Q2 Rear Brake Discs Rusting 
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    Quote Originally Posted by Old Nick View Post
    I wonder if you have come up with any more info. It sounds as though you might have a working knowledge and connection with Audi or VAG?
    38 years as a VAG group specialist... I would have served less time for murder, twice over! It is too new for my free to use system, I would have to log into ODIS to get deeper info and that costs me 10 Euro an hour.

    Quote Originally Posted by vwcabriolet1971 View Post
    Some disc manufactures used to M/C flat bottomed holes in the disc faces to indicate the limit of disc wear.
    Brembo used to do that but they stopped because people would complain that the discs was damaged, it caused so much grief that people stopped using Brembo.

    Quote Originally Posted by vwcabriolet1971 View Post
    Its a shame that most garages (& dealerships ) don't have brake skimming in-situ lathes.
    The problem is that most discs are below minimum thickness even before skimming. Setting up and running an on car disc skimmer costs more money due to time than a new set of discs. The reason garages like to fit new discs is not just a few quid profit but also the wheel face is then clean and true so saving even more time and they know the likelihood of noise related comeback is reduced to almost nil, garages don't like doing job twice.
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  8. Re: Q2 Rear Brake Discs Rusting 
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    I'm not sure about the economics of skimmming versus disc replacement. If the Americans can justify skimming why can't we ? . Ed China on the wheeler dealer Tv show saved a considerable sum by skimming 4 porche discs. Most scrap rear discs I've seen are scrapped because they are rusty not because they are thin. The big advantage of skimming , if done properly, is that there is minimal run-out as the M/Cing is done on the main hub bearings.
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  9. Re: Q2 Rear Brake Discs Rusting 
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    Wheeler dealers is notorious in the trade for not taking account of labour and proper Porsche discs are expensive, most normal VAG discs don't cost a great deal. Also the typical VAG disc is only allowed 2-mm of wear so 1mm per face and that is THE limit, not a fresh pad install limit where the typical skim takes off 0.5-mm on a discs already worn down 1-mm or more. The initial cost of these machines is huge, I can't find out how much because none of the UK suppliers seem to want to tell you but there was a used one for £4K and they say that you should charge £40 per pair of discs.... which is roughly half the price of a new pair of typical discs, I would rather spend that on new discs!
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  10. Re: Q2 Rear Brake Discs Rusting 
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    Actually I have a similar issue with my Q2, 2016, 16k miles on the clock, I just recently bought from an independent dealer (Ford, Arnold Clark). Audi advised rear disks and pads to be changed but the dealer ignored their advice. Don't think the Ford Dealership had VCDS to rewind the calipers.

    Anyway muggings here bought pads and disks from Audi and changed them myself. I've been changing my own disks and pads for over 20 years and these look really bad. However even after 200 odd miles the rear disks still don't look like the pads are doing much, I've made sure the pins are greased and sliding freely (used the grease from a TRW caliper service kit so its the correct pin grease), together with the seating points on the caliper. Perhaps there is an underlying issue with the calipers, even although the piston moves without issue?
     
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