SOHC.co.uk Forums > CB500/550

Front brake

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bobv7:
I'm sure this is not a new problem but not one I've encountered before as my bikes are normally used regularly, but having a few problems this year the CB500 Four is not getting ridden and the front brake keeps sticking on. I've just taken it apart, cleaned up and copper slipped inside the calliper. I will change the brake fluid but is there any way I can stop this happening again?

Erny:
Make sure that tiny hole connecting MC and fuild reservior is not clogged. It is very tiny but it is there

It should be one on red circle on attached photo - tine hole in the bigger one

Bryanj:
Also crud build up behind the caliper piston seal and makes the piston too tight to slide, plus the pivot pin in the swinging bracket the caliper bolts to

Johnwebley:
The caliper seal may have hardened. So it will not retract the piston

Sent from my SM-A750FN using Tapatalk

K2-K6:
You can easily test for the above two posted comments.

By unbolting the active side of caliper,  then holding your hand round the pad and caliper, very gently squeeze the brake level such that you can feel the pad start to move,  now when you let it go it should be felt retracting.

You are, in effect,  feeling the elasticity of the seal moving in it's clear groove.  If there's no retraction it indicates what the others have said above.

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