Topic: Tips- Frozen brake Caliper Piston?

[RustyStuff]

I'm working on a Suzuki Gs450. Getting it fixed up. I'm rebuilding the front brakes and I foudn out the Piston in the Caliper is stuck pretty good. Not sure why, it lookes like it's in great shape.

I tryed 100psi Air, No good. Right now I put some penatrateing oil in there to try and free it up.

Anything else I can try? Can't really afford a new caliper.

[trueblue]

screw the chuck off a grease gun and screw it into the caliper it will only go in a little, don't force it or it will stuff the threads, then just pump the piston out.

[MrGardman]

Trueblue has it right. The grease will just push the piston out and you also don't have to worry about that 100 psi of air shooting the piston across the garage.

[RustyStuff]

Cool. Thanks for the help.

[Dyrden]

I put the whole thing in boiling water and then poured ice water on the piston and used compressed air. It popped out into a rag I was holding the caliper with.

[RustyStuff]

I put the whole thing in boiling water and then poured ice water on the piston and used compressed air. It popped out into a rag I was holding the caliper with.

Keep that in mind for the next time.

The grease tip worked great. The penatraiting oil I sprayed in kept the grease from being a nasty sticky mess.

[trueblue]

Glad I could help, make sure you get ALL grease and oil out of the caliper, do the final wash with methylated spirits.

[RustyStuff]

Glad I could help, make sure you get ALL grease and oil out of the caliper, do the final wash with methylated spirits.

I scrubed it with Brakeleen, alcahol and Qtips. as clean as it's been in a long time.

I should have taken a pic of the master cyl, NASTY was an understatement. cleaned up well though.

Hope it works, seals were good, but there were some pits on the piston. Polished it up as best I could   gotta get more fluid and new pads, fork oil ruined the old ones.

Yay for old bikes? Atleast this one only has 2 carbs, the four on my honda are being massive pains.