Stuck brake piston - SV650.org

16-01-11, 07:34 AM

Rebuilding my calipers and 7 out of 8 brake pistons came out without hassles. the 8th is driving me nuts!

I thought compressed air would nail it, but with my compressor at max pressure, the piston just moves forward slightly then then retracts when the air is off.

Only thing I can think of is piecing the caliper back together (refitting the 3 pistons I have already removed), reattach the line, re-bleeding and then try and clamp the 3 pistons that are free moving to force the 4th out.

But, before I go to all that hassle, I thought I wold check if anyone else has any other clever ideas?!

Thanks
Luke

squirrel_hunter · 16-01-11, 11:07 AM

No other clever ideas, that is what I would do.

16-01-11, 11:10 AM

put some penetrating oil around the seal area (be prepaid to replace the seals) leave it for a bit, then get the air line on them when the piston moves back after you remove the line like you say it does it should drag some oil back past the seal with it repeat the process .

well it worked at my collage on a very old and rusty calliper

andrewsmith · 16-01-11, 11:40 AM

Luke try a small pair of small molegrips and a small rag and try unscrewing it from the body.

Worked on an opposed two pot

16-01-11, 11:42 AM

Quote:

Originally Posted by andrewsmith

Luke try a small pair of small molegrips and a small rag and try unscrewing it from the body.

Worked on an opposed two pot

please note it does not have to be a small rag ..... thank you come again

andrewsmith · 16-01-11, 11:45 AM

Quote:

Originally Posted by barwel1992

please note it does not have to be a small rag ..... thank you come again

Makes life easier and normally has to be chucked with the fluid that is stuck in the vacum behind

16-01-11, 11:47 AM

Quote:

Originally Posted by andrewsmith

Makes life easier and normally has to be chucked with the fluid that is stuck in the vacum behind

hehe

i know was just been a t*t

andrewsmith · 16-01-11, 11:48 AM

I know!

Get back in the garage and break something!

16-01-11, 11:49 AM

Quote:

Originally Posted by andrewsmith

I know!

Get back in the garage and break something!

i will be in a min the drill coming out and so is the broken exhaust bolt !

sorry for the derail

16-01-11, 12:07 PM

forget moleys mate-cut brush shaft to about 8 inches, shape end to fit tightly into piston, hammer in , turn and pull out at same time -take you minutes and you'll no screw piston

husky

16-01-11, 07:34 AM	#1
lukemillar Guest Posts: n/a	Stuck brake piston Rebuilding my calipers and 7 out of 8 brake pistons came out without hassles. the 8th is driving me nuts! I thought compressed air would nail it, but with my compressor at max pressure, the piston just moves forward slightly then then retracts when the air is off. Only thing I can think of is piecing the caliper back together (refitting the 3 pistons I have already removed), reattach the line, re-bleeding and then try and clamp the 3 pistons that are free moving to force the 4th out. But, before I go to all that hassle, I thought I wold check if anyone else has any other clever ideas?! Thanks Luke

16-01-11, 11:07 AM	#2
squirrel_hunter Member Mega Poster Join Date: Apr 2005 Location: Sunny Swindon Posts: 3,579	Re: Stuck brake piston No other clever ideas, that is what I would do. __________________ "A little enthusiastic?" May I add here, GG is awesome and I think I am in love with Stretchie...he rocks my world! SH2 \| 2MA \| GROM \| YSR

16-01-11, 11:10 AM	#3
barwel1992 Guest Posts: n/a	Re: Stuck brake piston put some penetrating oil around the seal area (be prepaid to replace the seals) leave it for a bit, then get the air line on them when the piston moves back after you remove the line like you say it does it should drag some oil back past the seal with it repeat the process . well it worked at my collage on a very old and rusty calliper Last edited by barwel1992; 16-01-11 at 11:11 AM.

16-01-11, 11:40 AM	#4
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Stuck brake piston Luke try a small pair of small molegrips and a small rag and try unscrewing it from the body. Worked on an opposed two pot __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

16-01-11, 11:48 AM	#8
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Stuck brake piston I know! Get back in the garage and break something! __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

16-01-11, 12:07 PM	#10
husky03 Guest Posts: n/a	Re: Stuck brake piston forget moleys mate-cut brush shaft to about 8 inches, shape end to fit tightly into piston, hammer in , turn and pull out at same time -take you minutes and you'll no screw piston husky

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