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Thread: Issue with front disk brake DI2
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09-20-2020, 06:45 PM #1Skiing powder worldwide
- Join Date
- Jan 2004
- Posts
- 4,115
Issue with front disk brake DI2
I picked up a new Cervello R5 with DI2 and Disc breaks. I have put around 180 miles in and when going downhill over 30 mph i squeeze the front break only to have it make this screaching noise. When i let up on it still screeches but eventually stops.
Sucks on a steep long descent.
Seems like the brake pads are not retracting when i let up on the brake handle.
Any suggestions before i bring it in to a shop?
Was thinking of gently working the brake pads with a screw driver.
Thanks
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09-20-2020, 06:50 PM #2Registered User
- Join Date
- Dec 2009
- Posts
- 1,685
I recently had this on my mtb. I tried cleaning the pistons and couldn't get rid of it. Mechanic put it on its back wheel and bounced it up and down several times. Then squeezed the brake levers, they were mushy. Apparently the bouncing puts the air up top to help with the diagnosis.
They did a bleed and it went away (only a short test ride so far)
Sent from my SM-N975U using Tapatalk
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09-20-2020, 07:00 PM #3
try other pads? (swap front and rear)
sand down current pads with drywall sandpaper
try other wheel (rotor) (swap front and rear rotor)
sand down current rotor with fine grit sandpaper
bleed brakes
re-face post mount on fork
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