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RE: Brake Master Cylinder questions

To: Henry Frye <henry@henryfrye.com>, ikorey@comcast.net
Subject: RE: Brake Master Cylinder questions
From: Bill Babcock <BillB@bnj.com>
Date: Thu, 3 Feb 2005 10:19:30 -0800
The reason brake pressure is so high with a failed power brake is that the
cylinders are large--an engineer told me once that it's a lot easier to
build and fit a short stroke assist servo than a long stroke. I don't know
why that would be so. 

I suspect you'd like a dual cylinder setup with adjustable bias. I'm playing
around with different master cylinders on Peyote, in part because I have so
many of them. I know it sounds odd, but I think using two MC of the same
size and adjusting the bias mechanically makes a lot of sense. If nothing
else you only need one size of rebuild kit to carry around. Right now I have
paired .70 tiltons. I'll let you folks know how that works out.  


Bill Babcock
Babcock & Jenkins

-----Original Message-----
From: owner-fot@Autox.Team.Net [mailto:owner-fot@Autox.Team.Net] On Behalf
Of Henry Frye
Sent: Thursday, February 03, 2005 4:21 AM
To: ikorey@comcast.net
Cc: FOT@Autox.Team.Net
Subject: Re: Brake Master Cylinder questions

Hi Irv, and the rest the gang...

I am the guy Irv is talking about that has the TR6 m/c with no booster and
likes it. I believe I am running the system as installed by Bruce Stutzman
when he built the car. TR6 front calipers with .70 wheel cylinders in the
back.  Finding the right brake lining material made a big difference, I am
running Panther Plus pads and shoes. Stopping the car is no trouble, it's
nothing like the pedal pressure required to stop a big power brake equipped
car when the engine cuts out.

I do think the high pedal pressure makes it easier to modulate threshold
braking. Also, I rarely flat spot tires.

I have also been thinking about changes to my brakes, but if I do I will be
going with a two master cylinder setup for two reasons.  First, I truly
doubt the added safety of the tandem master cylinder. When bleeding the
brakes, when I open any bleeder screw the pedal drops to the floor. Second,
I like the idea of the adjustability of the front to rear bias.

At 11:06 PM 02/02/2005 +0000, you wrote:
>Friends,
>
>My TR4 vintage racer is currently equipped with the full TR6 brake 
>master cylinder/vacuum booster set up. I would like to eliminate the
booster.

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