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Changing Brake Discs

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

  1. Avocet

    Avocet

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    Excellent! Thanks! Presumably, when you put it all back together, the car just adjusts automatically to the new pd thickness and takes up whatever slack it needs to? (I think they just tend to run the motors unti lthey stall, but I'm not sure. Sometimes on the company car, I manually apply the EPB and can year the motors running for a second or so, but when I turn the ignition on, they run again, very briefly. I therefore wonder if they only artially apply themselves most of the time the car is on reasonably level ground, and then just run until they stall when you turn the ignition off, or pull and hold the switch?
     
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  3. Mottie

    Mottie

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    Yes.
     
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  4. fixitflav

    fixitflav

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    I don't understand that. If the motor has been removed, how can it push the piston out?
     
  5. RickH

    RickH

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    The Service manual states that is removed they should be replaced - so I bought 4 new ones in readiness.
     
  6. Lower

    Lower

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    You are correct, if the motor is removed it can't push the piston out.

    The point i was making was that if you remove the caliper in order to remove the motor or to change the pads, you need to be aware that the car can apply the EPB for a multitude of reasons, and if it does apply the epb whilst the caliper is removed without a blocking tool of some sort in place, it will push the piston out of the caliper.
     
  7. RickH

    RickH

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    Perhaps a simple expedient approach would beto unplug the electrical wire that feeds the motor at the start of the job .... then it can't operate
     
  8. Mottie

    Mottie

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    Right, enough talking @RickH, let’s see some action!
     
  9. Lower

    Lower

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    Which throws a fault code on some cars...
     
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  11. fixitflav

    fixitflav

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    That's what mottie suggested in #85, but there's the fault code as mentioned in #86, though that may not apply to your car. If it does, I would hope the code would clear itself when everything put back together, but I don't know.
    Why do they have to make cars so bloody complicated?
     
  12. fixitflav

    fixitflav

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    OK thanks, but wouldn't you remove the motor before removing the caliper?
     
  13. Avocet

    Avocet

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    That's pretty standard practice because when you remove them, you disturb the thread locking compound on them. In practice, by the time they need to be removed, the thin layer of rust is plenty to hold them securely anyway. I've never replaced one and never had one come loose, but what you're doing is correct and "best practice".
     
  14. RickH

    RickH

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    Planned for this w/end ...... think, ask as much as necessary, plan, execute once. Remember the 7P's approach.
     
  15. fixitflav

    fixitflav

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    To fail to plan is to plan to fail :)
    Let us know how you get on
     
  16. Old Salt

    Old Salt

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    As a cautionary note, if people don't know what they are getting into there are some jobs best left to professionals or at least those who do know what they are doing.

    At least one more page to go :D
     
  17. Mottie

    Mottie

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    Well, how'd it go?
     
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