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Discs need replacement?

  • 07-02-2025 12:36PM
    #1
    Escapees
    Registered Users, Registered Users 2 Posts: 768 ✭✭✭


    Just confirming, I presume discs need replacing? The car is parked up most of the time and gathering rust. I'm guessing some hard braking isn't going to shine the disks up again for the NCT?

    IMG_20250207_112616.jpg


Comments

  • #2
    CMOTDibbler
    Registered Users, Registered Users 2 Posts: 9,830 ✭✭✭CMOTDibbler


    https://www.boards.ie/discussion/2058394610/discs-need-replacement

    Serious tram tracks engraved into those discs. I take it some brake pad changes came long after they were due?

    What I'd do is replace the pads if they're needed and put it in for test. Brake performance might still be within tolerance and if not, then you can change them. Looks like they've still some meat on them.



  • #3
    Escapees
    Registered Users, Registered Users 2 Posts: 768 ✭✭✭Escapees


    https://www.boards.ie/discussion/comment/123144340#Comment_123144340

    Thanks, it was the tram tracks as you put it rather than the pitting that I was worried about. The car was serviced recently and I just assumed they'd tell me the discs need replacing, but it sailed through with nothing being said about them! The pads weren't replaced on my watch, but there's plenty left in the ones that are on. The braking is very good but I suspect the NCT folk won't be happy with the worn tracks on the discs though!



  • #4
    CMOTDibbler
    Registered Users, Registered Users 2 Posts: 9,830 ✭✭✭CMOTDibbler


    https://www.boards.ie/discussion/comment/123144366#Comment_123144366

    I don't see how they'd have a problem if the brakes met the criteria. And afaik, it's performance rather than appearance. Judging by the state of them, it's unlikely they were pristine at the last NCT.



  • #5
    Neilw
    Registered Users, Registered Users 2 Posts: 3,836 ✭✭✭Neilw


    There’s a good chance that will fail, the inspection looks for scored discs which they are, it can also fail for insufficient contact between the disc and pad. If the pad isn’t clearing the rust off completely they could class that as insufficient contact.

    If it was my car I would be replacing the discs and pads, you mentioned the car is parked up a lot.
    It might need a brake fluid flush, the caliper sliding pins should be checked to ensure they are free.

    I would also inspect the caliper pistons and seals plus all the flexible and hard brake lines.



  • #6
    Escapees
    Registered Users, Registered Users 2 Posts: 768 ✭✭✭Escapees


    https://www.boards.ie/discussion/comment/123144608#Comment_123144608

    Thanks... I think the discs might be the originals and therefore nearly 20 years old, so probably no harm replacing alright. 'Scoring' was the word I was trying to think of earlier today :)



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  • #7
    CMOTDibbler
    Registered Users, Registered Users 2 Posts: 9,830 ✭✭✭CMOTDibbler


    https://www.boards.ie/discussion/comment/123144750#Comment_123144750

    My thinking here is that there may be other issues with your brakes and anticipating what may fail may still end up with a fail, so that's why I'd leave as is but be prepared for work to be done. A retest is cheap comparatively.



  • #8
    BrianD3
    Registered Users, Registered Users 2 Posts: 8,832 ✭✭✭BrianD3


    They'd look a lot better after a few hard stops. It doesn't look like heavy scoring, more the sort of thing you'd expect after a car has been parked up and had some light braking on top of rust.

    The inside part of the disk near the hub looks like it may be a case of insufficient contact between pad and disk but again a few hard stops may improve it. Or else take off the wheel and clean it up manually.



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