REFLECTOR: Leaking Brake Master cylinder

[Jim Agnew]

Kurt,
 
The answer on your Cherokee 235 is that the brakes are probably Cleavland and have external calipers therefore the lever arm is greater than the Matcos which have internal calipers and shorter moment arms.

Jim
 
James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying 



----- Original Message ----
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Thursday, February 14, 2008 11:11:49 AM
Subject: Re: REFLECTOR: Leaking Brake Master cylinder

Are you talking about max operating pressure?

pi * (5/8)^2 = 1.227 ~ 1.25 in^2
needs 360lbs of plunger force.

Same diameter as the originals, so performance would be identical.

NMFlyer1 at aol.com wrote:
> Brian & Or Jim,
>  
> Have you checked the pressure of the cylinders?  I noticed in the 
> paperwork I got back with my Matco brakes that they need at least 450 
> PSI to work right. (There was an upper limit too but I can't recall it 
> off the top of my head). I'm hoping that my upgraded ones work ok... 
> but Jim's data suggests they still may be marginal.
>  
> I find that strange. The brakes on my Cherokee 235 are half the size 
> of the Matco's.. I mean they are really small for the 2900 pound gross 
> weight. But they work just fine.
>  
> Kurt
>  
>  
>  
>
>
>
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