I changed the rear shoes on my 90 a few weeks ago and now they are sticking.
I noticed the ones that came off the friction material was further up one
end than the other. The new ones are the same at each end (about an inch
in).  Someone told me I need to file a chamfer on each shoe at the wheel end
as a 'square' edge can stic to the drum.
Does that sound right?
Thanks
Richard
ps. the pistons are free so its not them