Winding back Vauxhall Combo rear brake pistons

[Periproct]

Vauxhall Combo 58 reg. Rear disk brake pad change.

Can anybody advise me on how to get the piston back into the caliper to fit
new shoes?
I've splashed out on a rewind tool. I'm told pressure while you turn but
after an hour we only got the piston back far enough to put the old pads
back. (Was told that opening the bleed nipple might help but no joy).
The new shoes came with a bolt that looks like the one that holds the
handbrake mechanism to the back of the caliper. As I haven't a clue how this
system works I'm reluctant to pull too much apart.
Regards, Nigel

[Mrcheerful]

The correct rewind tool will turn and push the piston at the same time, do
not use one that just pushes, it is not suitable for rear calipers, some
calipers wind clockwise, some anti-clockwise, I can never remember which
vehicle uses which, but it usually becomes obvious within moments. it is
always better to let the excess brake fluid out at the bleed nipple rather
than push dirty fluid back into the system. The bolt that comes with new
pads is usually the one that holds the caliper to its bracket (yes, I know
there are two each side, but non genuine pads come with just one for each
side usually)

[Periproct]

"Mrcheerful" wrote in message news:qdKvt.71570$R94....@fx02.am4...

Thanks for the advice.
Googling isn't being very helpful and I'm still none the wiser as to how
they work. My simple mind would imagine some kind of ratchet mechanism on
the handbrake which would have to be overcome to push the piston back. I'm
sure the bolt supplied with the pads is the one that holds the handbrake
mechanism to the back of the caliper so maybe the handbrake mechanism has to
come off so I'm not fighting against it.
Off to do my stint of ill mother nursing so this will have to wait until
next week.

[Periproct]

Google disc, not disk helps.

http://www.autoshop101.com/forms/brake06.pdf

[Mrcheerful]

inside there is a threaded rod with a sort of spring loaded locking
plate/nut which can move in orer to take up pad wear. Forcing the piston
back will break the locking nut thing which is held with a circlip at the
bottom of the piston bore. I have sometimes managed to repair them after
animals have been at them, but replacement of the whole caliper is usual
these days.

[Periproct]

"Mrcheerful" wrote in message news:5tDwt.130649$xl2.1...@fx15.am4...

My wind back tool came with what they called a reaction plate with a hole in
it which meant it had to be fitted on the tool and then the handle of the
tool
passed through from the inside of the caliper. The piston was so far out
this
was impossible. I saw another wind back tool in Halfords which had a slot.
A few moments with an angle grinder and mine had a slot. Pads changed in
a quite respectable time (for an amateur) with no problems.

And the wrinkly 89 year old Mum has made a remarkable recovery from
pneumonia which means I'll have a bit more time to myself.

[Mrcheerful]

hurray, on both counts.