SOHC.co.uk Forums > CB350/400
Seized brake piston
PaulC:
Evening all, after some adventure with regards to my front brake woes. I bought ant untested complete 400/4 caliper unit, when I picked up a replacemnt frontend. I've tried various YouTube methods to get the piston out; greasegun etc. Could the actual tube be blocked I.e. where the banjo bolt screws in, as I'm getting fluid through the brake cables. For information: the cables, master cylinder, banjo bolts and bleed nipples are all new. The only thing I haven't tried is heat and the caliper is currently soaking in evaporust - until my patience returns 😀
Thanks in adavance Paul
Johnwebley:
Is the nipple loose?
You could try bleeding the system,
Then using the master cylinder to pump out the piston.
Or have I got it wrong?
Sent from my SM-A750FN using Tapatalk
PaulC:
Hi JW,
I primed the brake cable with fluid before fitting it to the caliper, then grasped brake lever but it wouldn't budge. So opened the bleed screw expecting a release of air but the lever still wouldn't budge!
--- Quote from: Johnwebley on November 26, 2021, 05:03:43 PM ---Is the nipple loose?
You could try bleeding the system,
Then using the master cylinder to pump out the piston.
Or have I got it wrong?
Sent from my SM-A750FN using Tapatalk
--- End quote ---
K2-K6:
They can get hellishly tight and need alot of effort to initiate moving, as you're finding.
When like that, probably only the hydraulic system will move it with the leverage needed. The mastercylinder will generate into the hundreds psi wise.
You could try putting a spacer onto the piston and squeezing in a vice to see if you can crack the corrosion sealing it seized, then see if it'll pump out. Sounds counter intuitive, but once moved from fully stuck they'll usually get going.
K2-K6:
Crossed over there ;D
If you can unbolt both caliper fitments, then use thin wire to "winkle" around into the bores to see if you can clear anything obvious.
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