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No power in disc brakes

  • 10-08-2010 11:13pm
    #1
    kenmc
    Registered Users, Registered Users 2 Posts: 7,277 ✭✭✭


    Just had the most horrible MTB ride ever, worse even than the time I wore out a pair of VBrakes half way around a muddy Ballyhoura.

    MTB was unloved and unridden since Feb or March, took it for a ride today and there was absolutely no power in the brakes at all, could BARELY manage a skid, and were squealing something else - both front and back. I've been careful NOT to oil them (and there's really very little chance that oil could accidentally get on the front anyway even from overspray on the chain). Struggled on all the descents, and really tired as a result of basically having the levers to the bars the whole way down everything, and STILL having the wheels turning (albeit slowly, thankfully) beneath me.

    Bike is 1.5 years old, last used for commuting in the ice back in jan/feb/march, but was washed down before being put away. Before that the bike had probably about 6-8 mtb outings.

    So where do I start to debug this one(it's Shimano Deore - M555)? New pads? Rotors? the calipers don't seem to be seized (without the wheels in place they close OK). The rotors seem to be quite dull, and a bit pitted. The pads were quite glazed when I took them out just now, so I rubbed them together and they came deglazed - but I can still hear them about to squeal just by braking a bit and pushing the bike along. Do they need to be bled? Total oil change?

    Argh!
    thanks for any advice.


Comments

  • #2
    CheGuedara
    Registered Users, Registered Users 2 Posts: 2,031 ✭✭✭CheGuedara


    Does exactly what it says on the tin


  • #3
    Morgan
    Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭Morgan


    If you can get the brake levers all the way to the bars then it sounds like they need bleeding.

    I wouldn't do any harm to clean the discs either - I use isopropyl alcohol - and try to deglaze the pads.


  • #4
    langdang
    Closed Accounts Posts: 3,857 ✭✭✭langdang


    Morgan wrote: »
    If you can get the brake levers all the way to the bars then it sounds like they need bleeding.

    I wouldn't do any harm to clean the discs either - I use isopropyl alcohol - and try to deglaze the pads.
    +1

    Some disc brakes don't take kindly to being unused for long periods of time, if a bleed doesn't sorted them then a seal/bladder somewhere may be fecked. I pulled out one bike after a few months of sitting in the shed and when I pulled the front brake it spewed fluid right out of the lever.


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