My new Ride1Up 700 has that weird brake noise on my rear wheel - often described as gurgling or underwater or toilet flushing. Several threads here and elsewhere about the issue with some reporting success changing the pad material - but not really explaining why only some bikes have the issue.
Brake disk is true and clean - so are the pads.
Closer inspection revealed that pressing the brake is flexing the disk to one side by about 0.25mm ( measured with a dial indicator gauge) which 'might' be the source of the problem. Both pistons are moving but presumably one has more force.
I don't know enough about bicycle hydraulic brakes to tell if this is acceptable or if there is something wrong - it sure smells wrong to me since front brake disk flexes only 0.02mm when pressed.
I could see having air in the system making the brake spongy but even if air was in only in one piston chamber it would not change the pressure of the system so I am confused.
Any ideas what may be happening?
Brake disk is true and clean - so are the pads.
Closer inspection revealed that pressing the brake is flexing the disk to one side by about 0.25mm ( measured with a dial indicator gauge) which 'might' be the source of the problem. Both pistons are moving but presumably one has more force.
I don't know enough about bicycle hydraulic brakes to tell if this is acceptable or if there is something wrong - it sure smells wrong to me since front brake disk flexes only 0.02mm when pressed.
I could see having air in the system making the brake spongy but even if air was in only in one piston chamber it would not change the pressure of the system so I am confused.
Any ideas what may be happening?