SOHC.co.uk Forums > CB500/550

Front Caliper problem

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Piki:
Hello there, I have a problem with my Front Caliper, the Front Wheel does not spin "freely", there is a constant "touch" with the pads. I adjust  it but nothing....It seems as If the Piston "not return" when I release the front brake, is the "seal piston" the problem? Any suggestion?
Thank you in advance.

Bryanj:
Four possible problems in most common order
(1) pivot pin siezed
(2) Tiny hole in master cylinder blocked
(3) piston/seal and groove need thourough clean
(4) Flexible hose is blocked/collapsing

mike the bike:
Remove the two M10 bolts holding the caliper onto the back part of the caliper and check that the arm that it was attached to swings freely.  if it doesn't, that's the problem.
Otherwise, the caliper seal may be worn, causing the piston to stick.  I suggest using the brake lever to pump the piston out prior to servicing.   Make sure the groove that the seal fits into is clear of crud.  A build up of crud causes the seal to wedge the piston.  Don't forget to put PTFE tape on the bleed nipple to prevent it from seizing.

Piki:
Hello Bryanj and Mike thank you for  your answers,

The pivot pint work well, the Tiny Hole....how can I check it? Push the Brake and release and the brake fluid return to the master Cylinder?
I had change  the Brake fluid the last summer and no problem.....
I have steel hoses....
I think that the problem is the seal...
Thank you in advance.

Johnwebley:
I had a similar problem,master cylinder clean,all holes open and clear,pivot smooth and easy,

it was the caliper piston seal,it had gone hard over the years,and stopped retracting the piston,
cost about £3 + p&p from DSS

fully cured the problem

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