New Disk Brakes squeaking.
02-12-18, 08:40 PM
#1
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New Disk Brakes squeaking.
Just put together my bike the other day. It came with shimano deore hydraulic brakes. I had to internally wire rhe rear brake so I ended up bleeding the brake and putting in new fluid. In the proccess I spilt mineral oil on the rear caliper and some got on the pistons. I cleaned it off with qtips and rubbing alcohol. Now the rear brake squeeks like hell. Also the front one does as well! The front was completely untampered and for some reason squeals.
I then cleaned both roters with rubbing alcohol and still these new brakes are squeaking.
What do i need to do? Im guessing the brake pads are contaminated. But i don't know how the front ones ended up with like that.
I then cleaned both roters with rubbing alcohol and still these new brakes are squeaking.
What do i need to do? Im guessing the brake pads are contaminated. But i don't know how the front ones ended up with like that.
02-13-18, 01:37 AM
#2
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You also may have gotten mineral oil on the front when you bled the lever if you had pads in the front brake and/or did not cover the front brake during bleeding. You can try to sand the pads, sand the rotors, and then clean the rotors with isopropanol. Also clean the calipers a bunch while you're at it. G01s pads are like $9 bucks at your LBS also, may be worth it in time and hassle to start with new pads.
02-14-18, 04:04 AM
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You need new pads. And they're cheap enough so even if you buy some and it doesn't work, you aren't out of pocket much however, having watched my son go through this, once pads are contaminated, they're history.
Interestingly, I was in a bike shop one day (buying pads for my son as it happens) and was served by the mechanic. He commented that whenever he works on disc brakes, the first thing he does is remove the pads and put them well away from the job.
Interestingly, I was in a bike shop one day (buying pads for my son as it happens) and was served by the mechanic. He commented that whenever he works on disc brakes, the first thing he does is remove the pads and put them well away from the job.
02-14-18, 07:11 AM
#4
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=1, just get new pads.. rubbing alcohol is not as srong a solvent to mineral oil as needed..
02-14-18, 10:58 PM
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It hasn't been mentioned but if you haven't used the brakes much they have to be bed in before they will stop squealing. Lots of info from Google.
The rear pads likely do need a replacement, though the fronts should be fine after being bed in.
The rear pads likely do need a replacement, though the fronts should be fine after being bed in.
02-14-18, 11:01 PM
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Clean them with some sandpaper. That will probably be enough. If not, install new ones.
02-14-18, 11:53 PM
#9
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bah you can clean pads. Hit em with a propane torch to burn off any oils and then sand them for good measure. Never had that fail.
