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not resolvedMy 2 year old CX bike is being a bit rubbish in the braking dept. I've had it serviced, and new cables put on. The mech says he thinks the discs have become Glazed. Anyone heard this before? I put new pads on, and now new cables. Suppose new disks might help, but was hoping not to have to replace everything!
Ideas?
The only time I've heard of discs being glazed is at Krispy Kreme.
Disc pads on BB7s or Deores can become glazed.
Bike Works say you could sand with very fine paper and use disc brake cleaner to restore - provided thy have some thickness left.
If it's serious oil contamination they may not be able to be restored. Once you're used to the grip of a front disc you get spoiled.
Clean the disc rotors with brake cleaner and check for scores.
You'll know this but for general audience...! On mech ones the non-moving inside pad should be moved in close every so often to prevent the rotor bending too much. People like moving outside pad as it's easy - particularly on the BB7s which have an easy to use red wheel to dial in. The bigger inside pad also has a wheel but is often sticky and needs a torque key. Shimano just use Allen keys on both.
Almost all disc will make a noise at some time or another as pads brush rotor till they bed in... Hydraulic discs are self adjusting.
I have a wire brush and have brushed the discs in the past, but only by hand. I could use my power drill and the wire brushes I have to see if this helps. At a tenner for a new disk, I think I can afford to trash one. I'll let you know how it turns out.
I don't know how oil could contaminate the DISC!? unless it got on and then was heated as I tried braking. I have disc cleaner (that Black and white stuff The Bike Chain used to sell - I forget the name) and have tried that before. It didn't help.
I don't know how oil could contaminate the DISC!?
Surface of a disc will look and feel smooth to the eye or finger, but I'm sure under a mincroscope is a myriad of tiny pits and channels into which oil and grease can sink, adhere and prove hard to dislodge.
I have a wire brush and have brushed the discs in the past, but only by hand. I could use my power drill and the wire brushes I have to see if this helps. At a tenner for a new disk, I think I can afford to trash one. I'll let you know how it turns out.
I don't know how oil could contaminate the DISC!? unless it got on and then was heated as I tried braking. I have disc cleaner (that Black and white stuff The Bike Chain used to sell - I forget the name) and have tried that before. It didn't help.
Both my discs are a little bit buckled. Just a teeny amount, but enough to make set-up a pain in the proverbial. I could get that weird fork thingy for re-aligning. Or I could get two shiny new discs...
I think I'll end up with new discs, but I'm waiting for Cotic to respond about stock and an L3 Tekro Lyra Adapter. They've given me great service and for the cost of a few quid I'd rather give them my cash.
WC, Older X's won't take 160mm rotors as the chain stays were bent inwards to give max heal clearance. Who'd a thought?? No eye deer what that means btw.
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