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Bedding in new brake discs and pads?

  • 02-03-2012 1:20pm
    #1
    [Deleted User]
    Posts: 18,962 ✭✭✭✭


    Hi, got new rear discs and pads all around yesterday along with brake fluid change. Braking is very weird at the mo - braking effect doesn't kick in until I've pushed in a good way with my foot and takes longer to engage. Is this a bedding in thing and is there a way to speed up this process - i.e. how to use th e brakes over the next couple of hundred km...?


Comments

  • #2
    muckwarrior
    Registered Users, Registered Users 2 Posts: 4,100 ✭✭✭muckwarrior


    The recommended bedding in procedure with my last pads was to perform 6-8 stops from about 50kph, then 4-6 hard stops from about 80kph. Do not drag the brakes.

    Your problem sounds like it might be more like a bleeding problem to me though, i.e. air in the lines. Does the pedal feel spongey/not as firm as before?


  • #3
    mad muffin
    Registered Users, Registered Users 2 Posts: 8,034 ✭✭✭mad muffin


    Sounds like the garage forgot to bleed the brakes. I'd get back to them straight away.


  • #4
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    There is a small lip on the front disks that the new pads have yet to fully bed into, this can take a couple of hundred kms depending on driving type and makes the pedal feel softer for a while as there is esentialy a gap between the pad and the disk.

    The bed in procedure mentioned above is for new pads and disks(which I know you have on the rear but not on the front)

    If you want to speed it up a bit then maybe an empty road somewhere to do some braking from speed. Not jamming on just progresive braking should do it.


  • #5
    mad muffin
    Registered Users, Registered Users 2 Posts: 8,034 ✭✭✭mad muffin


    For what its worth, every time I've had the pads and discs changed the braking has been sharp and noticeably improved.


    The only time it felt like what the op describes and I had to mash the brake pedal into the carpet, I almost crashed into the car in front.

    I turned straight back to the garage. They had a look and realised they forgot to bleed the brake lines.


  • #6
    mathepac
    Banned (with Prison Access) Posts: 4,991 ✭✭✭mathepac


    http://wiki.seloc.org/a/Brake_pad_bedding_in_procedure

    This is what I do, pretty much as the lads suggest above.

    There's a link to the Pagid procedure for all you Audi heads. :rolleyes:


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  • #7
    [Deleted User]
    Posts: 18,962 ✭✭✭✭ [Deleted User]


    Nissan doctor wrote: »
    There is a small lip on the front disks that the new pads have yet to fully bed into, this can take a couple of hundred kms depending on driving type and makes the pedal feel softer for a while as there is esentialy a gap between the pad and the disk.

    The bed in procedure mentioned above is for new pads and disks(which I know you have on the rear but not on the front)

    If you want to speed it up a bit then maybe an empty road somewhere to do some braking from speed. Not jamming on just progresive braking should do it.

    Did you bleed the brakes when you did the job for me :)


  • #8
    mickdw
    Registered Users, Registered Users 2 Posts: 23,688 ✭✭✭✭mickdw


    You will have a sh1tty pedal until the pad wears to the worn disc. There would be no real problem with the rears given you got new discs and pads there - Only very minor bedding in. Id say in a couple of days, you will realise the pedal is as good as its ever been unless the doctor filled your brakes up with air but I doubt that.


  • #9
    [Deleted User]
    Posts: 18,962 ✭✭✭✭ [Deleted User]


    well not going to worry about the brakes right now (even tho they make airy sounds when pressed). popped 1km up the road the car was screaming "coolant" - also had water pump and timing belt replaced. hopefully the engine is not damaged. not too impressed at this point.


  • #10
    john reilly
    Closed Accounts Posts: 409 ✭✭john reilly


    back brakes do F all and shouldnt make that much difference


  • #11
    [Deleted User]
    Posts: 18,962 ✭✭✭✭ [Deleted User]


    john reilly wrote: »
    back brakes do F all and shouldnt make that much difference

    pads done on front and fluid done also.


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  • #12
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    glasso wrote: »
    Did you bleed the brakes when you did the job for me :)


    You had a brake fluid change done. You haven't got a brake problem, just new front pads on old, although still within spec, front disks.
    glasso wrote: »
    well not going to worry about the brakes right now (even tho they make airy sounds when pressed). popped 1km up the road the car was screaming "coolant" - also had water pump and timing belt replaced. hopefully the engine is not damaged. not too impressed at this point.

    Ref: This thread too. http://www.boards.ie/vbulletin/showthread.php?t=2056566051

    PM replied.


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