Hydraulic brake - stuck piston
#1
Newbie
Thread Starter
Join Date: Oct 2022
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Hydraulic brake - stuck piston
Hey people
I have on my bike a couple year old Formula racing hydraulic disc brakes.
On the rear brake one of the pistons is completely stuck.
I removed the pads and tried to press the lever but only one piston is coming out - even if I try to apply pressure on the functioning piston.
Couldn't find any explanations for how to tackle this issue.
Any help?
Thanks
I have on my bike a couple year old Formula racing hydraulic disc brakes.
On the rear brake one of the pistons is completely stuck.
I removed the pads and tried to press the lever but only one piston is coming out - even if I try to apply pressure on the functioning piston.
Couldn't find any explanations for how to tackle this issue.
Any help?
Thanks
#2
Junior Member
I've experienced this on motorcycles. There were 2 solutions. Maybe one can be adapted to your situation.
1. Remove the caliper and block the moving piston and the hydraulic line inlet. Attach a grease gun to the bleed nipple at the caliper. The grease gun can apply much more pressure than the hydraulic lever.
2. Remove the caliper and block the moving piston. Place a rag over the stuck piston to prevent it from shooting across the garage. Using the rubber tip from a compressed air line, shoot air into the hydraulic inlet ... gradually increasing air compression after every attempt until the stuck piston is freed.
1. Remove the caliper and block the moving piston and the hydraulic line inlet. Attach a grease gun to the bleed nipple at the caliper. The grease gun can apply much more pressure than the hydraulic lever.
2. Remove the caliper and block the moving piston. Place a rag over the stuck piston to prevent it from shooting across the garage. Using the rubber tip from a compressed air line, shoot air into the hydraulic inlet ... gradually increasing air compression after every attempt until the stuck piston is freed.
#4
Full Member
My unqualified opinion would be to replace the caliper. I wouldn't want to risk freeing the piston up, only to have it lock up again on a downhill after touching the brakes to navigate a curve.
Likes For probe1957: