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Thread: Q2 Rear Brake Discs Rusting

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  1. Re: Q2 Rear Brake Discs Rusting 
    #21
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    I have experienced pedal "bouncing" and bad vibration on braking with skimmed discs, even when they had been machined off the car. This was presumably due to the two faces not being parallel, caused either by wear in the machine used, or operator incompetence/error.

    Accurate machining on the car would depend on the condition of the wheel bearings, which could not be guaranteed. I also wonder where the swarf ends up?

    I remember machines for balancing wheels on the car, which seem to have disappeared, probably for the same reason.
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  2. Re: Q2 Rear Brake Discs Rusting 
    #22
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    I was told many years ago that on the car balancing machines would not work on driven wheels with cv joints as when the suspension was at full travel off the floor, the drive shaft angle caused vibrations.
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  3. Re: Q2 Rear Brake Discs Rusting 
    #23
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    It doesn't matter whether the discs are M/Cd on or off the car or whether new discs are fitted any significant wheel brg run-out should be attended to 1st or there will be wheel braking "wobble". In my experience having the M/Cg done off the car is fraugtht with danger. Most machinists do not have a mandrel that replicates the wheel hub mounting and will attempt to M/C the discs on a 3 jaw lathe chuck and will not spend the time to get the disc running true or removing all the rust from the disc mounting surface
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  4. Re: Q2 Rear Brake Discs Rusting 
    #24
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    Many years ago I was at the shop of a now retired engineers for some engine machining work and Arthur, the owner, showed me a pair of discs that a taxi driver had brought in to have skimmed, he said their original thickness was 12mm and the minimum was 10mm but when brought in for skimming they were at 4mm.... needless to say he told the chap to go and buy new ones.
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  5. Re: Q2 Rear Brake Discs Rusting 
    #25
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    Years ago I was at a friend's garage in Spain, when Keith, the owner, showed me a car which had been brought in for attention to the brakes, which were pulling badly to one side.

    At the front, on one side the pads had almost disappeared into the disc, on the other side the pads had met, and the remaining outer ring of metal was hanging on the caliper.

    He said he was having a problem convincing the owner to pay for new discs and pads.
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  6. Re: Q2 Rear Brake Discs Rusting 
    #26
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    Hi All,

    I note when reading through this post that most of the Q2 vehicles mentioned are 2016 year vintage with between 16,000 > 22,000 miles. With the national average being 10,000 per year the stated mileage for these vehicles is lower.

    Then the low mileage vehicle is used less than expected the rear discs do seem to suffer from surface rust (I have heard the same for several VAG group vehiles, Jaguar and Ladn Rover all with lower than average mileage) Higher/Average mileage vehicle do not appear to suffer from the same concern.

    And the vehicle manufactures seem to follow the same recommendation'Rplace the pads and discs'
     
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  7. Re: Q2 Rear Brake Discs Rusting 
    #27
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    All cars with Hybrid or full electric drive are going to have to go back to drums as cast iron discs are too exposed and non ferrous discs far too expensive. As with a lot of electrification of transport, there are lessons to be learned along with a realignment of expectations.
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  8. Re: Q2 Rear Brake Discs Rusting 
    #28
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    I am sure expectations will be changing over the next few years!!

    With car manufactures always looking to save money and maintain the good looks of the vehicle the best route is back to good old fashioned drums!!
     
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