 You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
Any tips for ejecting a set of pistons on old hope m4's without hydraulic fluid?
Any future in something like a track pump on the bleed nipple?
Don't have a compressor but could rig a bottle rocket...
I used a track pump on bleed nipples on my car calipers.
Be very careful as they can fly out a lot faster than you think. I would suggest wrapping an old towel around them.
For safetys sake use the proper fluid as air will build up a pressure that will shoot the piston out whereas hydraulic fluid does not compress and will only move as much as required. clamp one piston in and free off the other a bit then swap about.
Often use a track pump but put the caliper in a bag to stop getting sprayed with fluid
Ok, just been trying track pump... One out three to go.
Better ways of attaching track pump to bleed nipple?
andyl - MemberBe very careful as they can fly out a lot faster than you think.
Working on the motorbike, I fired a piston (about 50mm across, none of your namby pamby pushbike things) about 6 inches into the ground. Another time, a mate came over to sort his brakes and he fired one completely over next door's house, and possibly knocked down a passing plane.
So yeah, careful.
Best bet is a grease gun - find a nipple (oh-er|) with the correct threads, connect grease gun and pump - out comes piston with no nasty explosive surprises. Has worked a treat on various seized caliper pistons in the past.