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[andycuk71]

On my rear brake caliper the plunger on the inside of the disc is siezed and am unable to push back in to get the new shoes in outside of the disc is fine. any ideas how to unsieze or remove some of the pressure?

[hotel21]

Tried opening the bleed valve a crack then levering the old pad/piston back in?  Its the better method, saves running the risk of popping seals back up the abs/master cyl and getting all the old crappy fluid out at the same time........

[andycuk71]

where is the bleed valve?

[TheBoy]

where is the bleed valve?

On the caliper - the one you use for bleeding the fluid

[Martin_1962]

Is it stiff or seized ?

stiff just a lot of constant force will eventually move it in. seized clamp off the pipe and remove the caliper, unless you want to risk filling the ABS controller with air.

Wood blocks are kindest to the disc and piston.

From here it depends how it fits or how it is stiff.

I am not suggesting my worst case fix (pump it out - not so good with ABS controllers), but vices and blocks of wood will help. As will twisting it.

Best preventative maintenance is hard braking, once overhauled I haven't had any braking problems with old cars once serviced, and I have replaced piston seals before.

[andycuk71]

got the caliper off what a oppsin nightmare and manages to get pistons back in what can I do to ensure they do not seize again?

[Martin_1962]

got the caliper off what a oppsin nightmare and manages to get pistons back in what can I do to ensure they do not seize again?

Occasional hard braking, thrashed brakes wear out but do not go wrong

[TheBoy]

got the caliper off what a oppsin nightmare and manages to get pistons back in what can I do to ensure they do not seize again?

Occasional hard braking, thrashed brakes wear out but do not go wrong

I would say regular servicing would be better

[Martin_1962]

got the caliper off what a oppsin nightmare and manages to get pistons back in what can I do to ensure they do not seize again?

Occasional hard braking, thrashed brakes wear out but do not go wrong

I would say regular servicing would be better

It is gentle usage will kills calipers, heavy usage doeas help. Originally told this by my dad who is a retired mechanic.

[TheBoy]

got the caliper off what a oppsin nightmare and manages to get pistons back in what can I do to ensure they do not seize again?

Occasional hard braking, thrashed brakes wear out but do not go wrong

I would say regular servicing would be better

It is gentle usage will kills calipers, heavy usage doeas help. Originally told this by my dad who is a retired mechanic.

Having had a few calipers lock up on works vehicles, trust me, heavy braking probably makes it worse.  Proper servicing is the best way....

[Martin_1962]

Don't know I have rebuilt a few in my time. My dad said that all the faulty brakes they had in were from too gentle usage and that is on all sorts of makes of cars (he was a mechanic for years - 1970s and some of 80s Peugeot - the ex Rootes palce stayed open my dad me first in and last out, then BMW until closure the Skoda & Subaru until retirement).

I work brakes quite hard and once fixed have never had a seized caliper since. THis is on bikes and cars.