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Pulsing rear brake **********

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Pulsing rear brake **********

Old 07-05-14, 09:00 PM
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squatchy
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Pulsing rear brake **********

So I rode one of my bikes that has been collecting dust for a while and the rear brake pulses. I have Ultegra brakes and Ksyrium Elites. When I got back in I checked the rim and it's not perfect but pretty close. I'm sure last time I rode it everything worked fine.

Any thoughts?
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Old 07-05-14, 10:05 PM
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The gremlins that last rode the bike wacked a pot hole...

Really have you taken a close look at the rim and caliper? Dented rim, wobbly rim, contaminated brake tracks, loose caliper arms can all contribute to a grabby action. Andy.
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Old 07-05-14, 10:23 PM
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If the wheel looks fine..... I assume you spun the wheel and watched the rim past through the bake pads and the wheel didn't wobble. I'd check the spokes. A broken spoke or nipple would look OK by simply spinning.... but the wheel would deform under weight.
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Old 07-05-14, 10:47 PM
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Stick with the front brake most of the time, it has more stopping power anyway.

And "ditto" to the gremlins hitting a pothole. If so, it could have flared out the rim a tiny bit so that's it's wider in 1 spot causing "grabbing". If you find the spot it can be fixed, sort of, somewhat, sometimes, maybe.
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Old 07-06-14, 12:55 AM
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OP; If your brakes are calipers brakes (guessing), an old that trick might help;

Remove the caliper fixing nut on the brake, pull the caliper out and flip it around, and install it from the under side of the seat stays. In effect, both of your brakes will now be facing the same way and work the same way front and rear. It may seem weird, but I started doing this back in the very early 70's when trying to get some decent stopping power out of the junk brakes of the era which were very flexible. Was also great to cut down the typical squealing and chattering. Still assumes you have run a nail file over the pads to clear off any glazing...

/k
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