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Brake disc question

  • 20-11-2011 2:22pm
    #1
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭


    I have just finished changing the front pads on my old astra and I had not noticed until now how bad the discs are. I will have to change them sooner rather than later. (I would have done them now if I could get them on a Sunday) Is it ok to drive for a week or two and change them then or would this mean having to get new pads again ?
    Thanks for any advice.


Comments

  • #2
    Turner
    Moderators, Society & Culture Moderators Posts: 3,935 Mod ✭✭✭✭Turner


    The warped or grooved discs could cut into and deform your new pads... So i wouldnt risk driving on them.

    The brakes will still work but you probably will ruin your pads.


    YOu could get alot of brake squeel
    You could then damage your new discs when you do get them with your new (and now damaged pads)

    Best to do them all at once.


  • #3
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    Yeah I soppose I already knew the answer, its never easy is it. They are working fine now though and no squealing either.
    Thanks for the reply.


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


    What is wrong with the disks? Where they worn with a lip around the outside? Or scored by the pads wearing down to the metal?


  • #5
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    Nissan doctor wrote: »
    What is wrong with the disks? Where they worn with a lip around the outside? Or scored by the pads wearing down to the metal?
    Lip around the edge, it was so big on the drivers side it took 15 minutes of prying to get the caliper off. I broke the lip on the inside actually.


  • #6
    [Deleted User]
    Posts: 23,339 ✭✭✭✭ [Deleted User]


    If they're just lipped and not scoured it should be ok to change then and quick with your new pads, a look at the pads would tell alot.


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  • #7
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    O.A.P wrote: »
    Lip around the edge, it was so big on the drivers side it took 15 minutes of prying to get the caliper off. I broke the lip on the inside actually.


    :eek:

    I think, if your going to drive on the new pads for a couple of weeks, then you'd be better just bite the bullet and get new disks and another set of new pads as the new pads will wear into the shape of the work disks and then won't bite properly on the new disks.


  • #8
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    Thanks for all the replys, I will park it for a week or until I have the new discs. The pads cost me 35 and I cant afford to waste my hard got shillings.


  • #9
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    If you get a sheet of fairly coarse sandpaper and stick it to a very flat surface (piece of thick glass) then you can sand the pads down until they look level again.
    This will take time and reduce the life of the pads by a small but but nothign to really worry about in 2 weeks of driving.
    Thats if the pads are very scored by worn discs, they might be fine.
    I had a look at some Corolla discs and they still look perfectly level after 11 years.


  • #10
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    CJhaughey wrote: »
    If you get a sheet of fairly coarse sandpaper and stick it to a very flat surface (piece of thick glass) then you can sand the pads down until they look level again.
    This will take time and reduce the life of the pads by a small but but nothign to really worry about in 2 weeks of driving.
    Thats if the pads are very scored by worn discs, they might be fine.
    I had a look at some Corolla discs and they still look perfectly level after 11 years.


    How level the surface of the disk is is only one part of checking disk condition, the other, arguably main, thing is the thicknes of the disk. So the disk 'looking' fine, doesn't mean it is.


  • #11
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭kkelly77


    O.A.P wrote: »
    I have just finished changing the front pads on my old astra and I had not noticed until now how bad the discs are. I will have to change them sooner rather than later. (I would have done them now if I could get them on a Sunday) Is it ok to drive for a week or two and change them then or would this mean having to get new pads again ?
    Thanks for any advice.

    I'd change them ASAP if I were you. What year/make of car have you got? Discs might be cheaper than you think. Will you be changing the discs yourself?


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  • #12
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    Nissan doctor wrote: »
    How level the surface of the disk is is only one part of checking disk condition, the other, arguably main, thing is the thicknes of the disk. So the disk 'looking' fine, doesn't mean it is.
    I was talking about the pads being worn to the level of the disc surface.
    I also check runout and thickness across the both disc surfaces as well so the discs were well looked after;)
    My point being that not all discs wear radial grooves in the disc surface, its dependant on type of use and how well they are looked after as to how worn or not the pads are.
    Some aftermarket pads (Mintex)actually have a layer of abrasive bonded to the pad surface that is designed to wear the disc down a little before the friction material starts to contact the surface.


  • #13
    swhyte027
    Closed Accounts Posts: 419 ✭✭swhyte027


    Good advice is to always change the pads when you put new disks on.its only a extra 30 euro or so.remember brakes are what stop the car so always take care with them.im not saying that it wouldn't be ok but as a professional they should always be changed as a set.


  • #14
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    Has anyone got any tips on removing the discs they are stuck like s--t to a blanket :mad:. I have the caliper off the carrier is still in place but it dont seem to be in the way. I have removed the small locating screw and hit it a few times with a piece of timber and a hammer but it is not moving.


  • #15
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    O.A.P wrote: »
    Has anyone got any tips on removing the discs they are stuck like s--t to a blanket :mad:. I have the caliper off the carrier is still in place but it dont seem to be in the way. I have removed the small locating screw and hit it a few times with a piece of timber and a hammer but it is not moving.

    Use the hammer without the wood....you don't need to worry about damaging the old disk.

    When you get it off though make sure you clean all the rust/corrosion off fully or the new disk may not sit flush.


  • #16
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    O.K its choose the weapon time chipping hammer, claw hammer, lump hammer, sledge hammer or consaw. I pick lump hammer, its not the disc I'm worried about its the hub when I get started ;)


  • #17
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    O.A.P wrote: »
    O.K its choose the weapon time chipping hammer, claw hammer, lump hammer, sledge hammer or consaw. I pick lump hammer, its not the disc I'm worried about its the hub when I get started ;)


    Hit the disk from behind, then your pushing it away from the hub;)

    Just wach out for any abs sensors etc..


  • #18
    O.A.P
    Registered Users, Registered Users 2 Posts: 1,380 ✭✭✭O.A.P


    Both off I used the sledge, I just needed to know it was the normal procedure thanks for that.
    Its lashing rain now so I have left it and I am going to clean the oil off the new discs would white spirit work for this, no break cleaner in the shed?


  • #19
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭kkelly77


    O.A.P wrote: »
    Both off I used the sledge, I just needed to know it was the normal procedure thanks for that.
    Its lashing rain now so I have left it and I am going to clean the oil off the new discs would white spirit work for this, no break cleaner in the shed?


    The 2 bolts holding the brake caliper on can normally be screwed into the holes in the discs and this will pull the caliper loose.

    Good video here too.


  • #20
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    O.A.P wrote: »
    Both off I used the sledge, I just needed to know it was the normal procedure thanks for that.
    Its lashing rain now so I have left it and I am going to clean the oil off the new discs would white spirit work for this, no break cleaner in the shed?

    It should do the trick I'd say.

    Stay at it sure, your missus will be really impressed when you come in covered in dirt, brake dust, rust, white spirits AND soaking wet!:P


  • #21
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    Nissan doctor wrote: »
    It should do the trick I'd say.

    Stay at it sure, your missus will be really impressed when you come in covered in dirt, brake dust, rust, white spirits AND soaking wet!:P

    Normal day in the Doctor household? :P


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  • #22
    jimmyw
    Registered Users, Registered Users 2 Posts: 3,382 ✭✭✭jimmyw


    Nissan doctor wrote: »
    Hit the disk from behind, then your pushing it away from the hub;)

    Just wach out for any abs sensors etc..

    yes that's what I did some time ago with mine with a piece of timber, worked a treat.


  • #23
    ARGINITE
    Registered Users, Registered Users 2 Posts: 2,719 ✭✭✭ARGINITE


    kkelly77 wrote: »
    Good video here too.

    Forget hammers the above video will save you a lot of hassle watched it a few months ago when doing my brakes and it worked a treat.


  • #24
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    challengemaster wrote: »
    Normal day in the Doctor household? :P

    It used to be alright, the better half even knows the smell of gear oil and diesel:P Luck enough to have a roof over my head when working at home these days but that only gets rid of the rain:D


    ARGINITE wrote: »
    Forget hammers the above video will save you a lot of hassle watched it a few months ago when doing my brakes and it worked a treat.

    Its only any good if your disks have the threaded holes in them. Not all do.


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