Bicycle Mechanics - what's up with my disc brakes?

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View Full Version : what's up with my disc brakes?

damn
08-10-04, 04:57 PM
first of all - im kinda newbie to disc brakes

it started with hi-pitch squeak when braking on both brakes.. just like cars.. and same loudness :(
so i read that this is normal for new bike

then i noticed strange sound (http://tmp.r0xor.com/wtf.mp3) when braking, like there's a sand on the calipers.. i recorded that sound just barely pressing on the brakes and spinning wheel with hand..

here's the calipers
http://tmp.r0xor.com/calipers.jpg

and here's the rotor

http://tmp.r0xor.com/rotor.jpg

as u can see both calipers and rotor have noticeable "rows" or something.. this is normal?

and do u know which brakes are on GT Avalanch 2.0 disc? they're Shimanos, but which exact model?

bmph8ter
08-10-04, 05:28 PM
Sounds normal to me. The marks on your rotors are fine too. This is the same way rotors & pads on a car (or motorcyle or whatever) wear.
damn
08-10-04, 10:03 PM
but those pads.. small holes all over them, is that ok?

forum*rider
08-10-04, 10:08 PM
new pads can't hurt right?
catatonic
08-10-04, 10:36 PM
those are the deore mechanical discs from teh looks of the rotor, I have that same set, and yes they squeal. I've played with mine, and am ready to accept it as part of break-in...as annoying as it is.

I'm not going to fidget with my bike much more for a while, since project: MTroadie is on it's way...now only to find a very very long handlebar stem and solid MTB forks ;)
damn
08-10-04, 10:59 PM
yep, that's deores..
well i've found somemanuals (http://www.shimano.com.au/publish/content/australia/en/cycling/customer_support/service_diagrams/2004_mountain_sd.MainContentPar.0024.Schematic.0007.File.tmp/SI-8C90E-BR-M475-En.pdf) and just completely disassembled and assembled back...

can't really check, since it's 1am here now, but that "sanding" sound dissapeared :p

and bad news - on the another side of the rotor there's nasty scratches all over the rotor.. will i have to replace the rotor? :(
http://tmp.r0xor.com/rotor2.jpg