Disc Brake Wont Stop Rubbing
stevet1992
Posts: 1,502
Ever since i bought my carrera vulcan disk from halfords a few weeks ago the back disk brake rubs. After adjusting the brakes this still didnt stop the rub so i took it down to halfords. The guy there looked at it and said that it was bent so procedded to fix it and it stopped rubbing.
Now the problem has come back and im at my wits end what to do about it What do you guys reckon will fix it?
Was hoping to go out on a ride up at chilham tomorrow but this and the bad weather means im not :x
cheers in advance
Now the problem has come back and im at my wits end what to do about it What do you guys reckon will fix it?
Was hoping to go out on a ride up at chilham tomorrow but this and the bad weather means im not :x
cheers in advance
0
Comments
-
well they have not fixed it yet so take it back.
Or read the info on park tools about setting up whatever brakes you have."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Interesting...... I bought the same model off a mate a few months back. A couple of days ago the same thing happened: the rear brake rubbing once every revolution. Adjusted the pads, had the wheel off, cleaned everything out...ended up worse than when I started. Now the static pad is rubbing continuously against the rotor with no more room for adjustment.
Was it the rotor or wheel which the Halfords chap fiddled with??
T0 -
he was fiddling around with the rotor
i figured out that as the disc brakes have one static and one moving pad the rotor gets slightly bent under the pressure of braking
well thats what i think it is0 -
no, that would be fairly stupid!
Caliper probably needs centering0 -
"no, that would be fairly stupid!"
Why is that a stupid assumption? If the static pad is set too far away from the rotor then the pad which moves will be forcing the rotor significantly out of true....Do this enough and its going to show. Would explain why my system has gradually been getting worse and why the rear brake is worse than the front (through harder braking).
t0 -
TomJG
correct so the static piston needs moving towards the rotor."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
if it is rubbing continuously then the rotor is likely bent or the piston not retracting, if it is rubbing in one spot then the rotor is warped.
Not sure of the brakes but if they sound like the hayes sole. once you have straightened out your rotor (which may well warp again after heating), you can adjust the static pad so it is closer to the rotor. this means less rotor 'skvish', better lever feel and better braking.--
Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails0 -
Unfortunately its got the stage where the static pad is adjusted as far away as possible from the rotor and is still rubbing almost continuously. Think I may have bent it cycling back from Morrison's with a heavy rucksack full of shopping (HARDCORE!).
Read a couple of articles which suggest taking bends out using an adjustable spanner to physically bend it back... Is this possible/wise on a such a knackered rotor?
Cheers for the info chaps/chapettes.... been riding for a while but never had to deal with this before. Nice forum!
t0 -
I 'tweak' all the rotors on the family bikes regularly to keep them as straight as possible, though none are as bad as you mention.
If they keep warping it maybe due to poor materials. you can buy rotors quite cheaply though.--
Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails0 -
sorry about the late replys guys
will have a look tommorow at my calipers see if i can move them closer but as far as i can remember there is only one little allen key adjusting bit
shall post back tomorrow as its to freaking cold to go outside right now0 -
If it squeaks horribly when you move the bike back and forth very slowly then the caliper has been knocked of alignment slightly and the disk is catching on the caliper. This was happening with mine and it was fixed by simply loosening the caliper and adjusting it slightly.0
-
--
Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails0 -
ok guys its got worse
now the back ones gone and makes a grinding like noise(part way between rubbing and grinding)
any ideas?0 -
all sorted now
all i had to do was take the caliper off and place it back on :shock:
sometimes the hardest questions have the easiest solutions 8)0