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Author Topic: '76 and earlier front brake piston spec question.  (Read 1161 times)

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Offline pddpimp

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'76 and earlier front brake piston spec question.
« on: March 04, 2009, 11:01:53 PM »
As usual I ended up tossing an old piston, not thinking I'd need it. Ugh.

Anyway, I was wondering if someone could measure the O.D. and length of the piston for me? I was also wondering if the piston cap (little aluminum piece the goes in the end of the piston) was necessary or can I skip it? I could buy one, but I have a chunk of stainless round bar that is yerning to be turned down.

Thanks...
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When the majority of the United States population get to be 70 years old, they will finally realize what is really important. And by then it'll be too late.


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Offline HondaMan

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Re: '76 and earlier front brake piston spec question.
« Reply #1 on: March 05, 2009, 05:33:51 AM »
You'll need the cap, or something that will take up the distance. Otherwise, the piston will cock in the bore and won't release the pad after applying the brake. Don't ask me how I know this, 'cuz I won't tell you...  ::)

I might (don't know for sure) have one in my big box of miscellaneous pieces for the Hondaman Specials. If I remember, and have one, I'll measure one this weekend.
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Offline pddpimp

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Re: '76 and earlier front brake piston spec question.
« Reply #2 on: March 14, 2009, 06:23:44 PM »
Bump  :)
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When the majority of the United States population get to be 70 years old, they will finally realize what is really important. And by then it'll be too late.


-'77 CB750 Cafe/Muscle bike (early clone)
Soon to have a hopped up 836cc *sold*

-'75 CB750 with a little bit of character

Offline pddpimp

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Re: '76 and earlier front brake piston spec question.
« Reply #3 on: March 23, 2009, 09:39:26 PM »
Hey guys, just wondering if someone out there could measure a piston for me. I need the outer diameter and the length of the piston (minus the aluminum cap). And if they have the cap, how thick is it ? (from the piston surface, out)


Thanks much..
Pete
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When the majority of the United States population get to be 70 years old, they will finally realize what is really important. And by then it'll be too late.


-'77 CB750 Cafe/Muscle bike (early clone)
Soon to have a hopped up 836cc *sold*

-'75 CB750 with a little bit of character

Offline pddpimp

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Re: '76 and earlier front brake piston spec question.
« Reply #4 on: March 27, 2009, 11:15:23 PM »
Hmmm...This must be a tricky one.   ;)
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When the majority of the United States population get to be 70 years old, they will finally realize what is really important. And by then it'll be too late.


-'77 CB750 Cafe/Muscle bike (early clone)
Soon to have a hopped up 836cc *sold*

-'75 CB750 with a little bit of character

Offline bryanj

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Re: '76 and earlier front brake piston spec question.
« Reply #5 on: March 27, 2009, 11:20:07 PM »
Not tricky you just need one in bits! From memory the diameter is 1 1/2 inch but no idea of length
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Offline pddpimp

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Re: '76 and earlier front brake piston spec question.
« Reply #6 on: March 27, 2009, 11:34:49 PM »
Yeah, just need the sizes. I'm going to make a couple at work, but I lost the old one I had.  :(
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When the majority of the United States population get to be 70 years old, they will finally realize what is really important. And by then it'll be too late.


-'77 CB750 Cafe/Muscle bike (early clone)
Soon to have a hopped up 836cc *sold*

-'75 CB750 with a little bit of character

Offline bryanj

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Re: '76 and earlier front brake piston spec question.
« Reply #7 on: March 28, 2009, 01:01:44 AM »
I remember measuring one and deciding that if the stainless bar was exactly 1 1/2 inch and unmarked it would not need turning but thats all i can tell you
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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!
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