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 Post subject: screeching brakes.
PostPosted: Sat Nov 19, 2011 2:07 pm 
Dirt Disciple

Joined: Tue May 24, 2011 3:30 pm
Posts: 72
Location: Bolton
I'm new to mountain bikes and i've just bought a bike off here, really enjoying it.
The problem i have is the brakes screeching really loudly, it only happens once i've slowed down, i've cleaned the discs and checked the pads but it still does it.
Any suggestion or ideas whats causing it.


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 Post subject:
PostPosted: Sat Nov 19, 2011 2:25 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
check all the rotor bolts and any calliper bolts. oh and make sure the qr is tight.

if still does it replace pads.

if it still does it it may just be that the combo of pad/disc/calliper/frame/forks just squeals.


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 Post subject:
PostPosted: Sat Nov 19, 2011 3:02 pm 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4074
Location: Antwerp, Belgium
Squealing can be the result of grease (no, really !)

Clean the discs with a degreaser and sand off the pads a bit. Then put everything back together and it should have stopped.
You'll need to break in the brakes again, but afterwards it'll usually be solved.
Oh, and don't ever touch the discs with your hands, as that's usually how the grease ends up there.

One very effective method of avoiding squeals on brakes that just won't stop making noise, is to file off the sides of the pads. A 45° angle should do the trick. I did that to the pads on my old MB-5, and it worked miracles on that.


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 Post subject: brakes
PostPosted: Sat Nov 19, 2011 6:06 pm 
Dirt Disciple

Joined: Tue May 24, 2011 3:30 pm
Posts: 72
Location: Bolton
Thanks lads, i didn't degrease the discs just wiped them clean, i'll clean the properly and replace the pads.


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 Post subject:
PostPosted: Sun Nov 20, 2011 8:24 am 
Dirt Disciple

Joined: Wed Mar 31, 2010 10:04 pm
Posts: 50
Location: Teynham Nr Faversham
A trick I use on car brakes but not used it on my Whyte yet, is a small drop of copper grease on the back of the pad, that goes against the piston. Smear it on the back only, not the braking surface for obvious reasons.

On cars the squealing is due to vibration and I only assume its the same on a bike.
Chris


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 Post subject: brakes
PostPosted: Sun Nov 20, 2011 10:03 am 
Dirt Disciple

Joined: Tue May 24, 2011 3:30 pm
Posts: 72
Location: Bolton
Good idea, i do the same on my motor bike brakes, i'll soon find out.


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