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Post by jwiffle on Sept 17, 2018 14:53:30 GMT -6
Hi. I have a SRAM red etap with hydro discs on a bike. The rear is fine, but on the front brake the calipers seem to stick under hard braking. As in, you come to a sharp hairpin on a steep descent, grab brakes hard, but when you release as you complete the turn, the front brake tends to make noise for several seconds until the calipers finally retract fully. Under lighter braking it does not seem to be an issue.
I tried taking the pads out and grabbing brake lever to get the calipers to mostly come out and cleaning them with alcohol, but it didn't do much to fix the issue. It's not a huge problem, but annoying.
Other ideas on things I could try?
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brentssc
Race Mechanic
SSC
Posts: 41 
First Name: Brent
Last Name: Davis
Location: earth
Shop / Company: Neutral Race Service
Bio: started in the 80's
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Post by brentssc on Oct 5, 2018 13:51:55 GMT -6
Have you discussed this with Sram they are very knowledgeable and helpful
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Adam N. Schmidt
New Member
Trying to get certified
Posts: 2
First Name: Adam
Last Name: Schmidt
Location: 80403
Shop / Company: Wheat Ridge Cyclery
Bio: Career Mechanic
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Post by Adam N. Schmidt on Nov 11, 2018 20:39:52 GMT -6
I would generally use Dot fluid to lube those pistons (mineral oil if its shimano) , only use alcohol after its been lubed to clean off the excess. that being said, everyone's brakes rub. if that's any consolation. if it only lasts a second after hard braking i wouldn't be too concerned. we ask a lot out of our hydraulic systems. ETap is no exception, even with its price tag #worthit
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Post by davidmc on Jan 2, 2019 23:51:02 GMT -6
Sticking pistons are one diagnosis and should be treated with the brake system's fluid of choice for lubrication, BUT - a sub-par bleed can also cause slow retraction, as the pistons are pulled back into place by both their seals and by capillary action. If there is air behind a piston, it can cause problems besides just fade.
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