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dura ace hydraulic caliper with tight spot

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dura ace hydraulic caliper with tight spot

Old 07-13-19, 06:19 PM
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superpletch
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dura ace hydraulic caliper with tight spot

my front hydraulic brake caliper has a sticky spot when applying causing front brake to grab. when I apply front brake at about 1/3 of application the lever hits a tight spot then breaks through the tight spot causing a quick application and brake to "grab"

my first thought is to clean and lube front caliper pistons and maybe give a good bottom hydraulic bleed.

the bike is equipped with a shaman dura ace lever and dura ace caliper and dura ace rotor r9120?

brake pads appear to be wearing evenly and bike does stop, more noticeable at slower speeds
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Old 07-14-19, 06:17 AM
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intransit1217
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Warped rotor?
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Old 07-14-19, 01:10 PM
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today I removed the wheel and brake pads and carefully pulled brake lever to extend caliper pistons and cleaned them with shimano mineral oil and a qtip, then worked pistons in and out carefully with tire lever and applying brake lever. I depressed pistons cleaned everything with isopropyl alcohol and put it all back together. after a short test ride it appears to be fixed.
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