Cant get any pressure to pump pistons from caliper

[Wise1]

Bike has been sitting for years so all the pistons are seized. Got back done ok and now onto front.

I had to remove the caliper completely to get pads out first, then I put the caliper back on to line to bleed and pump the pistons out, but I just cant get any pressure at all back in to pump them out.

Fluid is coming out of the bleed nipple and cant see any air.

The only difference between back and front being the pistons are in opposite ways, so for the back I could grip the inside of the piston to ease it out but with them being round the other way on the front I cant get anything inside the piston to help so the only way is to ease them out using fluid.

Just cant see why I cant get pressure built up after I have taken them off, there are no leaks anywhere.

any suggestions?
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Current - 2007 Suzuki Bandit GSF1250 - 1999 Suzuki TL1000R
Previous - GSXR750 SRAD, Fireblade, ZXR750, CBR600

[ssray]

What bike? try tying the brake lever back to the handlebar overnight, it allows any air out of the top of the system.
Ray

[Wise1]

Will try that, its a vfr750fg 1986

I was going to try using the compressor later but not sure if that will work. And considered heating some oil in the caliper but got nothing to hold it when the piston fires out and kills someone
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Current - 2007 Suzuki Bandit GSF1250 - 1999 Suzuki TL1000R
Previous - GSXR750 SRAD, Fireblade, ZXR750, CBR600

[Robert2014]

Lee Leave Bleed Nipple in and put the Airline into where the Bango Bolt go's and that will Pop out the Piston's for u mate
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[Ariel Badger]

Screw a grease nipple in the hole where the bleed is and blank off the hose connection with a plug and pump grease into her, she will pop.
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[stirlinggaz]

hi,
you have my sympathies.
im restoring an 1986 fg (though its the californian 700 model) & could not get the pistons out whatsoever- tried wd40,plusgas,airline, clamping one piston etc. wouldnt budge. (rear caliper though)
they had seized on, & when i removed the caliper i spent days trying to get the pistons out, but gave up & i'm just gonna get a replacement caliper! (after i priced new pistons & seals!)
as mine is the same as yours (except engine size obviously, if your needing manuals or any spares, give me a shout-likewise, if you have any spares etc)
just replaced rear shocker & started on front suspension. (still has funtioning ant-dive!)
next step, powdercoat wheels & engine casings (the usa bike has white wheels & gold engine casings)
then rip off the pair/evap system!
cheers,
GAZ

[ms51ves3]

[Ariel Badger]

Tissue and petrol like cleaning your nob after a dirty handed w@nk. If the caliper is this seized the entire thing needs striping so a spot of grease does no harm.
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Bikers make great organ donors, get 115 on your licence today.

[sickpup]

[stevo as b4]

I managed to use a piece of tube connected to a foot pump once, to remove pistons from the caliper of my mate's KTM. We tried the airline method on the front caliper though, and the next thing we heard was the ricochet of the piston hitting all the walls of his metal garage, and land on top of a shelf. We barely saw where it went, as we we ducking to avoid a direct hit between the eyes! It certainely removed the piston easily enough, but with far more violence than i thought it would!

Not sure if id try it again after that TBH.

[yambabe]

Have you got braided hoses or normal?

If not braided, apparently you could try undoing the bleed nipple and then (making sure the reservoir is full of fluid) squeeze the brake pipe gently with a pair of pliers about 2 inches from the master cylinder and pump the brake to see if you get any pressure.

If you have pressure pump the brakes and ease off with the pliers, then move further down the brake line and repeat, you may need to do it a couple of times.

I am being told that this will restore full pressure to your whole braking system so if you then close the bleed nipple and pump the brakes it should start to push your pistons out.
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[stirlinggaz]

[TAX MY BRAIN]

as said by other poster's

use compressed air , or grease gun,

just a word of warning they will pop out like a rocket .....
i always place a piece of wood between the piston's this will help in two ways,
it will stop the piston's flying out and it will also ensure that all the pistons come out
( one before the other so ones out and ones stuck )

also place a heavy towel over the caliper just in case they do fly might say your face,

good luck
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[Ariel Badger]

Grease is far safer than air as it does not compress and release a vast amount of kinetic energy. Things plop out rather than pop out.
____________________
Bikers make great organ donors, get 115 on your licence today.

[Wise1]

However using compressed air while pointing the caliper at a wooden bench to see how far you can get the piston to sink into the plywood is much more fun after all the hard work of trying to free it
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Current - 2007 Suzuki Bandit GSF1250 - 1999 Suzuki TL1000R
Previous - GSXR750 SRAD, Fireblade, ZXR750, CBR600

[Wise1]