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Brake Bleeding Sequence

Discussion in 'A3/S3 Forum (8L Chassis)' started by WorkInProgress, Jan 12, 2013.

  1. WorkInProgress
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    WorkInProgress Member

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    [Jan 12, 2013]
    Evening all,

    Going to bleed my brakes tomorrow as I've got a spongy pedal. I've had a search on here but can't find the thread but I know I've seen it.

    Could someone tell me the correct sequence to do it please? Do I do the master cylinder first or last?

    Cheers, Rob
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  3. Stutibs
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    Stutibs Member

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    [Jan 12, 2013]
    Master cylinder first, then osf nsf osr then nsr is how I did mine worked a treat
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  4. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 12, 2013]
    Do rears first... OSR, NSR then OSF, NSF and finally master cylinder... do NOT use the pump pedal method as this can damage the master cylinder by flipping a seal or damaging it as it over extends past the reservoir feed holes..

    Use a pressure bleeder

    <tuffty/>
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  5. 16Klappe
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    16Klappe Princess Clap.

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    [Jan 12, 2013]
    NSR first surely PT? Furthest from the master cylinder and work your way in?
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  6. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 12, 2013]
    Furthest from MC yes but crosses over to ABS pump first... I can look in the haynes I have to confirm tomorrow but fairly sure that due to the ABS pump on the nearside, off side is further away... its how I do mine anyways...

    <tuffty/>
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  7. WorkInProgress
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    WorkInProgress Member

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    [Jan 12, 2013]
    I picked up a Gunson pressure bleeder this afternoon, had read about damaging the seals. 20psi OK?
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  8. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Jan 12, 2013]
    You also need to to worry about the brake fluid reservoir, 20 PSI can sometimes cause them to burst, I would go for around 10-15psi that's what I've used in the past and never had a problem.
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  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 12, 2013]
    20psi is a little too high personally... try 15psi... I would also screw the cap on to the reservoir first then test the seal with the bottle and pressure connected but without fluid in the bottle... the seal on the reservoir can be a bugger to get right first time and if you do it with fluid in the bottle and its not sealed properly it will leak out all over the engine bay...

    <tuffty/>
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  10. WorkInProgress
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    [Jan 12, 2013]
    Does it matter which nipple I bleed on the master cylinder first?

    Cheers for all the tips, doing it in the morning so hopefully my spongy pedal will be sorted
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  11. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 13, 2013]
    Doesn't really matter on the MC which you do first but.... be VERY careful undoing the MC nipples though... they are small and prone to snapping off

    <tuffty/>
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  12. 666markyboy
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    666markyboy Well-Known Member

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    [Jan 13, 2013]
    I beleive the true sequence depends what model of ABS pump is fitted ? in my experience do the Master cylinder first then just keep going round the car pushing as much fluid through as you can .... i use a pressure bleed but also press the pedal a few times just halfway down , not all the way to the floor, also helps if you have vagcom so you can cycle the ABS pump a few times... Audi brakes are a pain in the ass to bleed if you get an air lock in them so good luck
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  13. Sam_
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    Sam_ Down under

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    [Jan 13, 2013]
    I must have been lucky but I pedal bled. I was just careful not to push the pedal too far. Worked fine and I have great pedal feel even with the big 6 pots. Pressure bleeding is easier that said. I just didn't have one with me at the time.
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  14. WorkInProgress
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    WorkInProgress Member

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    [Jan 13, 2013]
    Well managed all but OSF, pedal still **** so will need to take to the garage tomorrow instead of putting in for MOT as planned. Damp and fed up
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  15. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 13, 2013]
    Are the pads worn? worn pads can make the pedal overly long...

    <tuffty/>
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  16. WorkInProgress
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    [Jan 13, 2013]
    Brand new Tuffty
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  17. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Jan 13, 2013]
    Disappointing... normally once doing the calipers bleeding the MC typically brings the pedal back to a firmer feel... I know my pedal was a little long and felt a bit rubbish tbh but recently changed the pads and discs and this fixed that... brakes are a pain in the arse lol

    <tuffty/>
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  18. WorkInProgress
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    [Jan 13, 2013]
    Called my mate who has a garage, he'll look at it first thing so might make my MOT after all. Hoping it's nothing serious, did everything properly when changing the discs and pads. Wonder if I'm just being over cautious and it's the new discs and pads that will take a bit if getting used to
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