Hi. Well finally got around to stripping the rear brakes. Cylinders don't appear to be sticking, with a bit of pedal pressure, though one side was weeping a bit, so new ones on the way.
Yes Colin, there is a bit of brake plate groove wear, more so on one side. No welder to fill these, so have just smoothed off wear edges with a mini dremel thing so cylinders should slide easier.
I did notice that the lever pivot pins sit in the cylinder channel, a bit proud of the slide surface and assume this promotes the groove wear and the thumping.
I think I read a thread ages ago on CT where Bill Davis reckoned it was common with modern cylinders and to dress down the channel a bit so the pin is flush.
Think I will give this a go, if the new cylinders are the same.
What do you think?.
Cheers, Dave