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New Disk Brakes squeaking.

Old 02-12-18, 08:40 PM
  #1  
mymorningjacket
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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.
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Old 02-13-18, 01:37 AM
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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.
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Old 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.
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Old 02-14-18, 07:11 AM
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=1, just get new pads.. rubbing alcohol is not as srong a solvent to mineral oil as needed..
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Old 02-14-18, 08:00 PM
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What would be, mineral spirits?
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Old 02-14-18, 09:58 PM
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Originally Posted by evan326 View Post
What would be, mineral spirits?
Fire, maybe

put the pads on a stove and burn the oil out

or just buy new pads, probably a better idea
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Old 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.
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Old 02-14-18, 11:01 PM
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Cyclist0108
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Clean them with some sandpaper. That will probably be enough. If not, install new ones.
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Old 02-14-18, 11:53 PM
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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.
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Old 02-15-18, 08:15 AM
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Originally Posted by Canker View Post
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.
Would agree with this, no point in chucking away un-used pads, hit them with fire to burn any contamination off.
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