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Old 05-01-13, 11:24 AM   #1
owoOWOowo
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Trek 7.3 FX Disc - Squeaky disc brakes

Hi Everyone,

Recently purchased a used Trek 7.3FX disc (2009 or 2010 model I believe). Before I bought it, I had a test run and the brakes were squeaking very hard as I applied the brake. The owner decided to knock off another $50 for me to take it for a tune-up. I took the risk and decided to purchase it anyways, seeing it was a fairly good deal (I believe) at $350 CAD including pump and lock.

Question is, the squeaky noise, is that because the disc brakes need some oil (he hasn't ridden it in a couple years)? What should I apply to the disc brakes to fix the squeaking, or is it a bigger problem than that?

Thanks,
Matthew
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Old 05-01-13, 11:29 AM   #2
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No oil. Clean pads and disc gently but don't get finger oils on the pad surface. You might simply need new pads given the age. Doesn't sound like a big deal. Congrats on the bike.
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Old 05-01-13, 11:53 AM   #3
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Take the disc pads out they may have a surface glazing to remove.

My disc brake in front squeaks just when I'm going slowest and about to stop and it's raining.

any oil as said is a contamination, then you must buy new pads.
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Old 05-01-13, 02:58 PM   #4
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Many times, you can cut thru the glaze, with fine sandpaper on a very flat surface....... Like glass, or a formica counter top.
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Old 05-01-13, 03:23 PM   #5
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First just clean the discs. Take some Windex or other cleaner and wipe off the rotors. It's common for discs to squeak when they get dirty;they usually quiet down on their own after a couple good stops.

It's also possible that he put in different pads that are noisy,this happens sometimes with certain pad/rotor combinations. I swapped out the Hayes hydros on my Pt Reyes for Avid BB7's,but kept the original rotors. They squeal a little,but not enough for me to go to the effort of replacing the rotors or trying new pads.
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Old 05-01-13, 04:24 PM   #6
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Many times, you can cut thru the glaze, with fine sandpaper on a very flat surface....... Like glass, or a formica counter top.
And clean your rotors with rubbing alcohol.
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Old 05-01-13, 07:11 PM   #7
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great suggestions! I'll work on the bike this weekend and let you guys know how it works out.

many thanks to all of you.
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Old 05-02-13, 07:27 AM   #8
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By all means, use the alcohol to clean the rotors. Windex, or similar cleaners contain surfactants and detergents that will contaminate the area you are trying to clean Alcohol will clean them the best..
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Old 05-09-13, 12:54 PM   #9
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Just a quick update, turns out the disc brakes were perfectly fine... I gave it another ride after I got home and the squealing was gone. Probably as most of you brought up, just a layer of glaze on the pads.

To be safe, I took it back to the bike shop where the original owner purchased it and got a free tune-up (he bought the lifetime tune-up with the bike).

Now off to enjoy the bike...if only it would stop raining here.
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Old 05-09-13, 01:03 PM   #10
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Just a quick update, turns out the disc brakes were perfectly fine... I gave it another ride after I got home and the squealing was gone. Probably as most of you brought up, just a layer of glaze on the pads.

To be safe, I took it back to the bike shop where the original owner purchased it and got a free tune-up (he bought the lifetime tune-up with the bike).

Now off to enjoy the bike...if only it would stop raining here.
that's why you have discs... ride in the rain!
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