Author Topic: caliper piston wont budge TRIED EVERYTHING (Read 5809 times)

tygrant · « **on:** November 05, 2008, 05:30:15 PM »

title says it, the pad is broke off the steel backing to pad is still in there. i tried the grease gun trick and since the arent matching threads it pulled the first two threads of the greasr gun i picked them out and moved to the compressor rigged up some fittings to get air in it, tried 75 then 100 then 125(max on my compressor). wouldnt budge so i put 125 to it and started whacking it. nutin. i put it back ont the brake line bled out the brakes and standing on the brake lever and it wont move. i then cut into the caliper housing on the bottome of it so i could get at the steel backing prying at it with the brake lever being squeezed by my brother and it wont budge... cut it in half with acetalyne and get a new one??? i have about had it.

oh it sat in penetraing oil for three days prior to this

OldSchool_IsCool · « **Reply #1 on:** November 05, 2008, 05:59:49 PM »

Are you trying to save the piston or the caliper? Did I read your post correctly, you cut into the caliper?

Pistons are fairly easy to replace, the caliper not so much. If you have ruined the caliper, you might as well abandon it and start looking for a replacement with a moving piston.

tygrant · « **Reply #2 on:** November 05, 2008, 06:14:19 PM »

only about a quarter inch on the bottom so i could get the backing on the pad. wont affect it if i can rebuild it.

tbpmusic · « **Reply #3 on:** November 05, 2008, 06:24:39 PM »

Get a new (or functioning used) one.

Don't mess around with brakes - they gotta work right every time.

bill2

tygrant · « **Reply #4 on:** November 05, 2008, 06:27:51 PM »

im starting to think that. this is crazy i put 125psi to it and beat on it with a hammer it didnt even budge

mystic_1 · « **Reply #5 on:** November 05, 2008, 06:40:09 PM »

Unscrew the fitting on the end of your grease gun, thread the stem into the brake line hose in the caliper (it'll only grab a couple of threads because it's the wrong pitch, but it's good enough) and then pump the caliper fill of grease. Piston will come out.

Air is compressable. Grease, not so much.

mystic_1

tygrant · « **Reply #6 on:** November 05, 2008, 06:51:27 PM »

yea i did that. no dice. tried a few times and finally it pulled the few threads right off the end of the grease gun.

mystic_1 · « **Reply #7 on:** November 05, 2008, 07:24:56 PM »

Gadzooks!

Hmm, Holy Water, maybe?

mystic_1

mystic_1 · « **Reply #8 on:** November 05, 2008, 07:28:32 PM »

Ah, saw that in your original post you'd already tried the grease gun trick.

Personally I'd buy a different caliper at that point. Not worth taking chances with it, as others have already said.

That said, I'd totally understand an obsessive compulsion to get that MF out of there no matter what it takes, just for the principle of the thing. I've been there myself

Bake it in the oven maybe? Better yet, freeze it, then try the grease gun trick while it's still nice and cold.

mystic_1

tygrant · « **Reply #9 on:** November 05, 2008, 07:40:37 PM »

i was thinkin freeze it then hit the outside with a torch then try? but yea im lookin for a caliper at this point and once i get one im geting the acetalyne torch and cuthing fukcer in half

rhinoracer · « **Reply #10 on:** November 05, 2008, 08:48:05 PM »

Have you tried pushing it in with a press or a bottle jack? Once it breaks free it'll come out a bit easier with grease.

Really? · « **Reply #11 on:** November 05, 2008, 09:01:31 PM »

Screw one of those body hammers into it and bang away.

crazypj · « **Reply #12 on:** November 06, 2008, 01:04:23 AM »

Had exact same problem
A correct thread bolt, copper washer and some heat worked real well for me.
link to photobucket for more pics
http://s91.photobucket.com/albums/k315/1crazypj/Honda%20CB360/?start=40

tygrant · « **Reply #13 on:** November 06, 2008, 05:15:33 AM »

what do you mean correct thread bolt? correct threads for the grease gun? im at my wits end. i filled it back up with penetraiting oil again before coming into work this morninga nd im going to tackle it again tonight. any new ideas are welcome... anyone has a spare caliper that would work too...

MRieck · « **Reply #14 on:** November 06, 2008, 05:39:45 AM »

Think of all the time and effort expended and you are no closer to getting that piston out. Get a used one. If it won't come out with the master attached move on.

Gregorymoto · « **Reply #15 on:** November 06, 2008, 06:15:10 AM »

FYI That is why it is a good idea to cover the back to the pad with a light coat of anti seize.

tygrant · « **Reply #16 on:** November 06, 2008, 06:18:16 AM »

yea well i just got this bike and its been sitting since 98, i think im going to look for a used caliper. this sucks

Gregorymoto · « **Reply #17 on:** November 06, 2008, 07:15:17 AM »

I might have one for you. Send me a note at mountaingregory@yahoo.com
I'll go look for it today.

tygrant · « **Reply #18 on:** November 06, 2008, 07:26:02 AM »

havent tried pb blaster, GT85 though... its never let me down before http://www.gt85.co.uk/

gregory motor Il send you a pm, thanks

crazypj · « **Reply #19 on:** November 06, 2008, 11:12:46 PM »

Quote from: tygrant on November 06, 2008, 05:15:33 AM

what do you mean correct thread bolt? correct threads for the grease gun? im at my wits end. i filled it back up with penetraiting oil again before coming into work this morninga nd im going to tackle it again tonight. any new ideas are welcome... anyone has a spare caliper that would work too...

I didn't use grease gun.
I used an engine bolt with 10x1.25thread. Used extra long bolt so I could put a vice grips on it (and stood on them

)
Blocked everything solid so when I heated it up the fluid expanded and pushed piston out (like a cannon actually so its a good idea not to be studying for movement at close quarters) had it pointed into a box so I wouldn't have to hunt piston down in next doors yard.(only went about 6~10ft)
It was stupid and fun, that's why I tried it (hey ya'll, hold my beer and watch this

)
Where are you in NH? My wife has a property near Greenfield (Nashua area)
PJ

Hush · « **Reply #20 on:** November 06, 2008, 11:49:54 PM »

You guys crack me up, try dynamite ha ha ha.....damn frustraiting I know.

tygrant · « **Reply #21 on:** November 07, 2008, 04:45:45 AM »

at this point i have about had it and im looking for a used one. i am from Pelham NH, very close to nashua only few minutes away.

KB02 · « **Reply #22 on:** November 07, 2008, 05:06:50 AM »

Almost makes me wonder if the darned thing is in there crooked.

Yeah, get another one... Then the get the TNT.

tygrant · « **Reply #23 on:** November 07, 2008, 05:14:15 AM »

i dont have any tnt.. but i do have aluminum powder and potasium perchlorate... mix it 70/30 and youv got flashpowder. (the stuff in m-80s) its either that or the torch. lets take a vote haha

Chris Liston · « **Reply #24 on:** November 07, 2008, 05:37:25 AM »

I'd just buy a new caliper off ebay and save yourself the trouble.

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Author Topic: caliper piston wont budge TRIED EVERYTHING (Read 5809 times)