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I have guide rsc on my bike, with bleeding edge, the 2017 model that should not have problems with the piston.
However, yesterday, in a hot day, 35 celsius, and riding for much time in direct sunlight, the pads suddenly rubbed the brake disc a lot (i almost couldn't ride uphill), and the lever lost much of its travel. (only the rear brake)
I guess the sticky piston said hello to me
I really don't want to mess with it, changing piston etc, so i am thinking of changing just the rear brake.
Do code rsc have the same problem?
By piston, you mean in the lever, not the caliper right?
I just had to do my Guide R leaver the other day. The kit only costs £16ish and it’s not to difficult, or your lbs could do it?
My Guide RSC died on me the other week in Finale.
The rear brake lever just wouldn't compress leaving the caliper at the rear completely open.
Fitted new lever internals. Bled the brake. Rode to a bar and had an Aperol Spritz and a little aperitivo. Got back on the bike and had then exactly the same problem.
Supposedly, according to my bike shop owning friend, its a fairly common problem and that is why he had ten or more sets of Guide internal kits in the shelf.