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Old 12-25-10, 03:35 AM   #1
rolliepollie
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Juicy 3.5 disc pad gone bad???

Hi all,

My new Trek Fuel EX from last year came with Avid Juicy 3.5 discs, and while the rear locks up fine, the front is just weak the first 5-10 min; initially takes 2-finger braking with only the front brake almost at max strength, going down ~20% grade. I've only ridden it under 50 or so miles (slacked off majorly since getting a job), so it's been sitting in the garage for months.

Below are pics of the pads and rotor. I'm wondering if it's "glazed"? It's seen rain and mud, so maybe oils got in? Also, the bottom pad (and top one, to a lesser extent) seems like only about half are in contact with the rotor, judging by the darker patch.

I'd like some feedback before trying sanding it and cleaning with alcohol. If new pads are required, do I need a new rotor?
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Old 12-25-10, 06:18 AM   #2
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looks like i see a black streak right through the center track of the rotor. an indication of contamination. if you need new pads just clean the rotor with alcohol. how is the lever feel on the front. spongy or firm. it is much easier to lock out and skid the rear. to skid or lockout the front you will basically be on your way to a crash.
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Old 12-25-10, 07:20 AM   #3
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looks like i see a black streak right through the center track of the rotor. an indication of contamination. if you need new pads just clean the rotor with alcohol. how is the lever feel on the front. spongy or firm. it is much easier to lock out and skid the rear. to skid or lockout the front you will basically be on your way to a crash.
Hey, didn't notice that streak! The lever is pretty firm, like the rear. It seems much easier to lock the rear, with much more "punch" when I brake with 1 finger.

So I should probably replace the pads, then? I can't even lock the front while the bike is sitting still, with me putting weight on a pedal horizontally.
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Old 12-25-10, 07:27 AM   #4
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if you can still move the bike while applying the brake on the ground then its time for new pads. i dont bother with trying to clean them or burning them. clean the rotor thoroughly before putting on the new pads. give the new pads a few rides to break and bed in.
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Old 12-27-10, 08:19 PM   #5
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I went ahead and replaced the pads for $20 - didn't feel like risking overbaking and affecting the glue. However, the old ones when dissassembled and sandwiched together, there is a tiny gap in the middle so the pads didn't seems to be flat and even on the rotor. Seemed like guesswork so didn't bother fixing them.
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