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Changing Brake Discs

Discussion in 'Car Repairs / Maintenance' started by RickH, 5 Oct 2021.

  1. RickH

    RickH

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    If you electrically retract handbrake ... does that also pull pistons back ... or do you have to do both?
     
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  3. fixitflav

    fixitflav

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    Without looking at the video again, I think it said retract the mechanism electrically (via the scanner), then you push the pads back. Might need to use a lever of some sort, or a G-clamp, but straight back, no turning.
     
  4. Mottie

    Mottie

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    Correct. Or, with no scanner, just remove the two screws that hold the motor onto the rear of the calliper and manually wind it off by hand. Refit it when done and just put the handbrake on.
     
  5. RickH

    RickH

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    OK ... think I have this ....
    1. Manually retract EPB mechanism by one of following:
    A. Using Scanner
    B. Electrical direct Connection
    C. Removing Motor and winding back​
    This removes actuator from back of piston.
    2. Then push piston backwards, and no need to rotate as EPB already retracted. (lever or G-clamp etc.)



     
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  6. Avocet

    Avocet

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    They're normally a fine-pitched thread. (Plus, I'd be worried about using M8 as I think there's a pretty good chance the OE ones would be higher tensile and shearing a pair of 8.8 bolts in an emergency stop would definitely ruin your whole day...)!
     
  7. Avocet

    Avocet

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    Yes, but as Burnerman (and possibly others) said earlier, just keep an eye on the fluid level in the master cylinder reservoir in case it overflows when you push the pistons back.
     
  8. Avocet

    Avocet

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    I'm interested in this, as we've just got our first car with an EPB and although it doesn't need doing at present, I Will have to, one day. If you take them off, to allow the pistons to come back, doesn't that mean the new pads are too thick to put them back on afterwards?
     
  9. Avocet

    Avocet

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    There are two similar ones. The XZN has a sloping drive face to the spline. There's also a "Ribe" fastener, which has parallel faces to the spline:

    https://www.ebay.co.uk/itm/201061622700

    Not sure which sort your car will have.
     
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  11. Lower

    Lower

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    I'm sure that Mottie knows this, but for other people's benefit you need to be really careful that you put the car in a mode that it won't automatically apply the EPB part way through the job. If it does apply the epb whilst you've got the caliper off, it'll push the piston out of the caliper.

    When i recently did my wife's evoque which is too new for the old button press sequence that puts the epb into maintenance mode, i had to have the engine running, the drivers door closed and the gearbox in neutral for the duration of the time i had the caliper off. I had a proper wind back tool so it was easy to do, but something as simple as opening the drivers door would cause the car to apply the epb.
     
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  12. Mottie

    Mottie

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    That would be a nightmare! If you have any concern, disconnect the electrical connector at the epb motor.
     
  13. Lower

    Lower

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    If you do that on the evoque, it apparently logs a fault code even if the car is off.
     
  14. Mottie

    Mottie

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    You disconnect the motor from the calliper, just two bolts. You can then, with the aid of a socket, wind the mechanism back, away from the rear of the calliper piston. Once this is done you can then push the piston back like any other calliper piston. You need to do this because the new pads will be thicker than the old ones. Here's a picture of my calliper and piston which should show what I mean.
    5E9CC4AA-ACE0-4A2B-924B-DA9FBAE9C620.jpeg
     
    Last edited: 13 Oct 2021
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  15. Mottie

    Mottie

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    Do you have the same user name on one of the Evoque forums?
     
  16. Lower

    Lower

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    Yes. The evoque owners club forum where i originally went on in the hope of finding the sequence for putting the epb into maintenance mode on the current version of the evoque. Are you stalking me :)
     
  17. Mottie

    Mottie

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    Nah. I remembered the name and just checked. I don’t go on there as much now that I’ve changed cars. I am on the same forum. (y)
     
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