SOHC.co.uk Forums > CB500/550
Spring caliper
DomP:
I always use red rubber grease on brake rubber components
K2-K6:
By two piston, I'm referring to having two X seal retraction, one for each pad of that "conventional type of caliper.
This Honda type, hybrid of mechanical and hydraulic design, still needs two X pad clearance when brake is released to work well. With only one piston seal, that has to facilitate the total clearance needed when it's retracting, then to be "distributed" by the spring and clearance you've set on that static pad. Without which one or both pads will be too heavily in contact with the disc rotor.
Adjusting the screw, you are effectively chasing pad wear as it accumulated for that static pad as its not facilitated by the hydraulic design.
deltarider:
Thanks for explaining. Here's the reason I brought it up. I have a very slight unrest in steering, between say 60 and 85km/h. I have checked everything and all is good. I have noticed that whenever I have (re)adjusted that bolt to spec, the unrest is gone.
It is not dangerous; with just one hand at the handlebar that slight unrest does not increase, let alone it develops into a tankslapper. Also there is no increase in the disk's temperature. It's a minor issue. I'll do some experimenting and will report back if removal of bolt and spring brings any improvement.
McCabe-Thiele (Ted):
Forgive me for asking the obvious, have you removed the long caliper arm and checked the pivot pin for wear, iirc there are two O rings fitted to keep water out. Also is the bracket for the top fixed part secured correctly, are the threads in good condition where it bolts to the forks bottoms?
deltarider:
My pivot pin still swings like new. I have understood there can be a problem with previous models. If you consult the appropiate parts list for my CB500K2, you will see my model has the newer -390- caliper holder. Also the pin underwent modification. Maybe that's the reason I never had to service these parts. As a matter of fact, the two O-rings I have bought decades ago, are still in their plastic bag.
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