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Easing back rear brake pistons - without doing damage.

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Sprunghub:
I can't imagine I'm the first to find this tricky. I'm about putting new pads in the rear brake on the F1.  I expected, because I knew no better ::) - that the 'contact face' of the piston would be flat......but as far as I can see in the dark recesses it's hollow ?? & it's just the outer "rim" which presses on the back of the pads ? either that or the pistons are stuck in the chambers & I can't see any piston  :o
The 'old' pads were pretty 'thin' & there was well short of the necessary gap to drop the new pads in.  I've been able to get the 'outer' of the two gaps increased - hopefully by retracting the piston rather than bending the disc, the piston did seem to "give" a bit but the inner one is a bu**er.
Just a matter of patience & application ???.......or is there a trick......the front one, which is now working took three elephants standing on it to retract it - I can't see me getting that sort of 'wellie' onto the back one & hope I haven't got to break the whole rear end down just to change a pad. :-\
Needless to say, the Manual says' "remove old pads & replace with new" - & I'm more used to brake shoes  ;)

N

Sprunghub:
....& the answer is.....take off the rear caliper assy, apply clamp, clean up & replace. 
Ho hum.

mick:
I was just about to say thats what i ended up doing  ::), they pick up all the dirt and crap in those rear calipers no wonder they stick and the only way to give them a proper clean is to strip 'em down,  ;) cheers Mick.

Bryanj:
If they are that tight you would be better pumping them out and fitting new seals after cleaning out the caliper especialy the seal grooves

Sprunghub:
Cheers both, re-fitted & bled through.  I need to get her in 'test' so I can road run her & tweak her whilst managing the tidying up....otherwise she'll sit in the garden & that's not much good :-[

Have managed to get a late notice appointment for this afternoon....fingers x'd ;)

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