CA_Boomer5150
09-12-10, 03:07 PM
i have a specialize big hit 2...with the front shimano disk break is rubbing on the callipers...need advise on hoe to fix..wud be appreciated
Bicycle Mechanics - shimano disk break rubbing
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reptilezs
09-12-10, 03:14 PM
push pistons back into the caliper with a clean tool and re install wheel. pump lever and recenter caliper. true rotor as necessary
Luke52
09-12-10, 03:17 PM
Hydraulic or cable?
Check out this link for a guide. http://www.bv.com.au/forums/viewtopic.php?f=22&t=18848
Check out this link for a guide. http://www.bv.com.au/forums/viewtopic.php?f=22&t=18848
Luke52
09-12-10, 03:18 PM
push pistons back into the caliper with a clean tool and re install wheel. pump lever and recenter caliper. true rotor as necessary
We dont know whether it's a cable or hydraulic brake yet. If it's cable, you don't push the pistons back in as you would on a hydraulic brake...
We dont know whether it's a cable or hydraulic brake yet. If it's cable, you don't push the pistons back in as you would on a hydraulic brake...
Mondoman
09-12-10, 05:06 PM
And there I was thinking "break rubbing" might be an offshoot of "break dancing".
BCRider
09-12-10, 07:02 PM
And there I was thinking "break rubbing" might be an offshoot of "break dancing".
But it sounds like a LOT more fun if it's done with a partner..... :D
Regardless of which type be sure the wheel is properley seated in the dropouts each and every time you replace it. Also the caliper needs to be properly centered to the rotor with different settings for this based on single sided piston or dual pistons. Once you're sure these two things are done then check the rotor for running true and carefully flex any out of true spots back into line. If it's a dual piston hydro system that USED to be OK and you're sure the rotor is flat and the wheel set fully into the dropouts then you may have just grunged up the pistons. In that case blast it clean with some brake cleaner and work the pistons against the rotor to get the grunge out and free up the pistons.
But it sounds like a LOT more fun if it's done with a partner..... :D
Regardless of which type be sure the wheel is properley seated in the dropouts each and every time you replace it. Also the caliper needs to be properly centered to the rotor with different settings for this based on single sided piston or dual pistons. Once you're sure these two things are done then check the rotor for running true and carefully flex any out of true spots back into line. If it's a dual piston hydro system that USED to be OK and you're sure the rotor is flat and the wheel set fully into the dropouts then you may have just grunged up the pistons. In that case blast it clean with some brake cleaner and work the pistons against the rotor to get the grunge out and free up the pistons.
CA_Boomer5150
09-14-10, 02:27 PM
sorry forgot to mention its hydrolic and and its more of the callipers are pinching the disc. i was driving up to cali from az and the shifted some way so the front break was being pressed and its been "pinching" since then i cant even free spinn the front weel for more than 5 sec.
Luke52
09-14-10, 03:23 PM
sorry forgot to mention its hydrolic and and its more of the callipers are pinching the disc. i was driving up to cali from az and the shifted some way so the front break was being pressed and its been "pinching" since then i cant even free spinn the front weel for more than 5 sec.
Okay, so when you say "pinching" you mean it's grabbing on one part of the rotor, and slowing the wheel down? Or is the brake rubbing the whole way around?
Either way, first try recentering the caliper (See the link I posted earlier for a detailed how-to.) If that doesn't work, you may need to tweak the rotor to true it up again.
Okay, so when you say "pinching" you mean it's grabbing on one part of the rotor, and slowing the wheel down? Or is the brake rubbing the whole way around?
Either way, first try recentering the caliper (See the link I posted earlier for a detailed how-to.) If that doesn't work, you may need to tweak the rotor to true it up again.
Dan Burkhart
09-14-10, 06:17 PM
Before doing anything, ensure the axle is firmly and fully seated in the dropouts. Can't tell you how many disc brake problems I've made go away by this simple procedure.
CA_Boomer5150
09-17-10, 01:40 PM
the break is rubbing the whole way around. it may be the outside caliber sticking but it doesnt seem like that is going any further back thou than it is now
Luke52
09-17-10, 03:59 PM
the break is rubbing the whole way around. it may be the outside caliber sticking but it doesnt seem like that is going any further back thou than it is now
Okay, first try recentering the caliper. Loosen the mounting bolts, wiggle the caliper, and squeeze the lever 2 or 3 times. On the 3rd time, keep holding the lever tight, so the brake is locked, and tighten the mounting bolts. Release the lever, and see if it spins freely or not.
Okay, first try recentering the caliper. Loosen the mounting bolts, wiggle the caliper, and squeeze the lever 2 or 3 times. On the 3rd time, keep holding the lever tight, so the brake is locked, and tighten the mounting bolts. Release the lever, and see if it spins freely or not.
CA_Boomer5150
09-23-10, 06:26 PM
ya ive tries that doesnt work i believe one of the caliper is stickining but i not 100% on that