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Cable op disc brakes....squeal. Tips?

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Cable op disc brakes....squeal. Tips?

Old 10-09-17, 08:11 PM
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FolderBeholder
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Cable op disc brakes....squeal. Tips?

The missus and I have 2 identical ebikes, 6 weeks into ownership and the Tektro disc brakes on BOTH front wheels squeal when NOT braking. The bikes both have approx 161 miles on them from new. The bike brand, and the fact that these are ebikes is likely immaterial; the brakes are Tektro.

Im not familiar with cabled operated discs, Ive tried to adjust the cable tighter, as well as looser and they both squeal much of the time while in motion. Under braking, the squealing stops.

Ive also fallen back on my longtime motorcycle ownership and maintenance practices and used compressed air to blow the (ample amount) dust out of the calipers to no avail. The rears dont give this problem.

Any tips on the care and feeding of mechanically operated bicycle discs? Im stumped....
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Old 10-09-17, 08:17 PM
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sand the disc and pads with 120 grit emery paper... then watch a youtube vid on setting up disc brakes on bikes, and follow the procedures described...... then avoid buying tektro brakes in the future.
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Old 10-09-17, 08:22 PM
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Originally Posted by maddog34 View Post
sand the disc and pads with 120 grit emery paper... then watch a youtube vid on setting up disc brakes on bikes, and follow the procedures described...... then avoid buying tektro brakes in the future.
Ha! They came with the bikes.
Did someone say YouTube?
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Old 10-09-17, 08:52 PM
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I have TRP cable discs, and when they squeak I wipe down the disk rotor with rubbing alcohol, and try to keep any greasy fingerprints, spray lube, or anything else from touching them. On a damp misty ride, or maybe heavy ocean spray, they will still squeak sometimes, but a couple of squeezes, and it usually stops. I was on a ride yesterday, and a lady had Shimano hydro discs, and hers squeaked worse than mine as we road along the coast highway, with big waves and heavy spray. Sometimes you can squeeze them while pedaling hard, and the extra heat will clean them off, too. It's a lot less work on an ebike, just squeeze the brakes and apply lots of electrons. Sometimes lightly sanding the pads will help too.
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Old 10-09-17, 09:39 PM
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if they squeal when NOT braking, then something is rubbing when it shouldn't be.
I like to use a feeler guage (clean of oil first!) between the pads and rotor to make sure there's a gap when mounting the caliper.

could be a warped rotor brushing the pads intermitently

caliper mounting tabs might not be perfectly aligned, causing pads and rotor to hit at a skew
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Old 10-10-17, 10:18 AM
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I have better squeal free performance from the Kool Stop organic compound pads, than I did with the original BB7 pads.
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Old 10-10-17, 05:36 PM
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Originally Posted by xenologer View Post
if they squeal when NOT braking, then something is rubbing when it shouldn't be.
I like to use a feeler guage (clean of oil first!) between the pads and rotor to make sure there's a gap when mounting the caliper.

could be a warped rotor brushing the pads intermitently

caliper mounting tabs might not be perfectly aligned, causing pads and rotor to hit at a skew
+1 , I total agree here .
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Old 10-10-17, 07:03 PM
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Thanks folks for all the good (and even some of it mediocre) advice.

I was able to successfully adjust both bikes’ brakes. One required backing out the static pad and readjusting the cable throw, the other required re-centering the caliper over the rotor.

And more importantly I’ve learned something and added value to my pay-grade as the maintainer of our ever-changing fleet.
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