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Installing new pistons and seals to get around sticky piston problem. Have installed seals and inside piston easily, but really struggling to get the outer piston past the new seal while pushing from the inside. Have put a small amount of DOT on the seal and on the outer edge of the new piston, but no joy.
Any thoughts?
Your not trying to compress air / fluid are you ?
Removed hose and lever so just working on caliper.
Freeze the piston? (or heat the housing, not sure what material the piston is)
Or use lots more DOT to lubricate it in. Check the seals are properly seated and pressed in as well. And if they are directional, make sure they are in the right way.
Seal in just fine. Piston is phenolic. Is freezing piston worth it? Will try more DOT.
How exactly am I meant to push the outer piston from the inside to the outside? It's supertricky getting any force because the gap is so small!
Swapped back to the old seal and applied lots of DOT to the piston. Went in fine. Will see how it bleeds and sets up. Thanks for help.
cakefest - Member
Piston is phenolic. Is freezing piston worth it? Will try more DOT.
Won't make a blind bit of difference - have you tried the piston for size without the seal?
Pop it in the post to Hope, let them do it.
Once the bore cap is removed and If it's lined up correctly and there's lube on the piston and seal it'll pop in no probs. Then push in the other one, refit bore cap, attach hose etc.. Bleed and job done
Used to take me ages to change pistons/seals, especially on M4's.Went on a factory tour at Hope (been 3 times now) and got chatting to one of the ladies who builds the calipers.Took her about 20 seconds to do the seals and about another minute to do 4 pistons!!
Made a point of spending time on the assembly side after that rather than staring at CNC machines and learned loads of really helpful stuff from people who do it all day,5 days a week.