Front brake locked on

[Bryanj]

Dave Silver is now doing stainless piston cheaper than genuine(

[meerkat]

Dave Silver is now doing stainless piston cheaper than genuine(

[SteveD CB500K0]

Let us know how you get on with Kevin's piston.

I've heard a lot about them.

S

[ST1100]

Don't forget to clen out the seal groove really well or the piston will still be tight

While refurbing the the brake systems (and more) of other motorcycles, I made pretty good experience with car type rim-cleaner (Sonax, etc...), which removed/softened all kinds of deposits very well.
Also used it on aluminum engine/gear casings without any noticeable corrosion.
However please proceed with care, as I yet don't know personally about the effects on the materials used on those older bikes!!
Use as advised, apply, let soak for 2 minutes at max (might use nylon brushes there), rinse carefully with lots of water; repeat procedure if necessary.

[ted_paper]

I've fitted one of those phenolic pistons about 5 months ago and everything seems fine.

[meerkat]

Let us know how you get on with Kevin's piston.
I've heard a lot about them.
S

First off, the service from Kevin was excellent ! The piston was with me in good time and I fitted it today for a quick road test.
After stripping the caliper down, I found the source of the problem which was the badly corroded piston.
While the caliper was stripped, I drilled (5.5mm drill) and tapped the caliper arm for a 1/4" x 28NF grease nipple and cleaned the pivot bolt up. New brake fluid to replace the emulsified muck that was in there and the bike was as different as chalk and cheese.
Many thanks again to everyone on here for the good advice given.
Photos added.

Postscript. Just had a run out to renew the MOT. Passed OK.