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  #1  
Old 06-30-2016, 11:56 AM
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Default Caliper pistons

     

I bought a pair of moose brake caliper pistons for my 1994 honda cr250.
The originals include a metal cap that goes on the piston and presses against the brake pad.
They have a cut out edge to keep the metal caps in place.
The new pistons dont have this.
Can i just install them and have them press directly on the brake pads?
And what side would be against the pad?
I am wondering what kind of material the moose pistons are made out of.
Does anyone know?
Moose doesn't repsond and the ebay seller says all is good but..I dunno.

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Old 06-30-2016, 12:21 PM
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The closed in goes towards the brake pad.
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Old 06-30-2016, 05:26 PM
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Quote:
Originally Posted by bjunior View Post
The closed in goes towards the brake pad.
Open side against the pad actually.
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Old 06-30-2016, 05:59 PM
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Quote:
Originally Posted by 2 stroke bloke View Post
Open side against the pad actually.
So, no caps needed?
I am afraid the material will crack and crumble quickly.
I cant tell what its made of, thinking bakelite??
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Old 06-30-2016, 06:01 PM
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Quote:
Originally Posted by Wolf View Post
So, no caps needed?
I am afraid the material will crack and crumble quickly.
I cant tell what its made of, thinking bakelite??
No, no caps needed.
They'll be fine.
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Old 06-30-2016, 10:18 PM
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I asked the same question to a mechanic about witch way piston goes in caliper He said solid side goes out.My question is will it be a problem it works fine that way?
It bleed with no problem.You reallycant tell by manual . have FUN RIDING THIS YEAR/
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Old 06-30-2016, 10:24 PM
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Quote:
Originally Posted by bjunior View Post
I asked the same question to a mechanic about witch way piston goes in caliper He said solid side goes out.My question is will it be a problem it works fine that way?
It bleed with no problem.You reallycant tell by manual . have FUN RIDING THIS YEAR/
I don't suppose it would really matter. If they're working OK, just leave them until next time you're working on them.

On a positive note, you would be carrying more fluid in your brake system. So, less chance of boiling it .
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Old 06-30-2016, 10:25 PM
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thanks
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Old 07-02-2016, 03:52 PM
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no worries about these just install them correctly and use the open side to the pad. no need to have extra fluid, it could possibly lead to a "mushi" feeling on the lever and might be difficult to bleed the fluid out of there correctly.

the caps are used as heat insulators, since you do not have them with your new pistons try to find heat insulator pads that go onto the pads
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Old 09-01-2016, 05:08 PM
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Thanks for the advice guys.
The front brake still isnt as hard as I would like it to be but its pretty ok.
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Old 09-01-2016, 08:21 PM
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Quote:
Originally Posted by Wolf View Post
Thanks for the advice guys.
The front brake still isnt as hard as I would like it to be but its pretty ok.
Have you tried back bleeding it?
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Old 09-01-2016, 09:01 PM
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Stainless steel lines will help firm up the feel if you haven't installed them yet.
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Old 09-02-2016, 01:52 AM
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Yes, a lot of hours of bleeding, also reverse but no succes.
Yes I got the Hel stainless lines on the bike.

I think it is taking in a tiny bit of air somewhere.
Either at the seals in the caliper or at the pump, but no fluid leaks.
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Old 09-02-2016, 02:22 AM
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If you suspect the seals and or master cylinder are bad, why don't you just replace them?
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Old 09-02-2016, 02:47 AM
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Quote:
Originally Posted by JMV View Post
If you suspect the seals and or master cylinder are bad, why don't you just replace them?
I know, but I put a lot of money in restoring the parts I got.
You know how it is, bit by bit.
But its ok for now.
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