Author Topic: stuck piston on '74 cb550 front brake-- help!  (Read 1701 times)

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Offline crowned

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stuck piston on '74 cb550 front brake-- help!
« on: September 26, 2008, 09:55:39 PM »
Hey everyone-- I just picked up a 1974 honda cb550 that is in pretty good condition.  It looks amazing and runs well, but the front brake was dragging when i got it so I decided to pull the caliper off today and rebuild it.

Well, I unbolted it and took the pads off, and pumped the lever a few times to try to pop the piston out.  it came out really far (28.4mm of the piston is exposed at the moment) but I can't get it to budge ANY farther.

I disconnected it from the hydraulic line and put on a rubber glove and tried to pull it out, I tried to pry it out with bicycle tire levers, and then i put it back on and pumped again.

I read that grease guns and air hoses can be used to pop stubborn calipers out, but is there another way?  I don't have either of those at my disposal.

Please, please let me know what I can do to get this guy out (or if I should somehow be way more of a man and be able to take it out with my hands).

Offline Dunstall_74

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #1 on: September 26, 2008, 10:12:16 PM »
This topic has been beat to death in several threads, but to answer your question, most guys use a grease gun and pump grease into the caliper til' the piston pops out.  Some guys use compressed air.  I would search the site a bit.  Lots of great info.  Good luck :)
''It is clear our nation is reliant upon big foreign oil. More and more of our imports come from overseas.''
—President George W. Bush, Beaverton, Ore., Sep. 25, 2000

Offline Shenanigans

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #2 on: September 26, 2008, 10:18:15 PM »
Compressed air. pfffffffft BANG. Free piston.
   This pretty much sums it up.   76' CB592 cafe. 69 750 project, 03 CBR954, 75 750 super sport.

robscb350f

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #3 on: September 26, 2008, 10:45:52 PM »
grease guns are cheap to buy, and do a great job. 

Offline bryanj

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #4 on: September 27, 2008, 02:16:01 AM »
If you aint got grease or air re-connect it fill the master and bleed the system then pump it out with the master
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline crowned

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #5 on: September 27, 2008, 01:43:00 PM »
okay-- popped it out with a grease gun.  sorry to bug ya!

Offline Dunstall_74

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Re: stuck piston on '74 cb550 front brake-- help!
« Reply #6 on: September 27, 2008, 08:56:51 PM »
okay-- popped it out with a grease gun.  sorry to bug ya!
No need for apologies, that's what this forum is here for.  Glad you got that damned piston out, good luck w/ the rest  :D
''It is clear our nation is reliant upon big foreign oil. More and more of our imports come from overseas.''
—President George W. Bush, Beaverton, Ore., Sep. 25, 2000