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[Healeys] Dual Circuit Braking system

Subject: [Healeys] Dual Circuit Braking system
From: greylinn at ozemail.com.au (Peter & Veronica)
Date: Thu, 30 Jun 2011 11:57:55 +1000
References: <000001cc36b5$a9ab5460$fd01fd20$@rr.com>
G'day Robert

I've used a Datsun 240Z master cylinder on my V6 BN1. It's mounted in the 
original position on the frame rail. I do have discs on the front but the 
balance seems fine (car's been on the road for 18 months) Only issue was 
making a bracket to mount the unit to the original bolt holes. I can send 
some photos if you're interested.

Cheers

Peter Linn
Brisbane Oz
BN1 Ward Spl coupe
BN1 Holden V6

PS I had a similar experience with my Series 3 Landrover when a brake lining 
parted company with the shoe!

-----Original Message----- 
From: Robert Bender
Sent: Thursday, June 30, 2011 9:38 AM
To: healeys at autox.team.net
Subject: [Healeys] Dual Circuit Braking system

Ever since my friend lost a wheel cylinder under heavy braking in traffic
with his vintage Land Rover and had to do some tricky unplanned off road
driving to avoid playing

Bigfoot on the cars ahead, I've been pondering the idea of a dual circuit
braking system in my BN2.  I searched the archives and cannot find much of
anything for information

on this project.  I realize the Denis Welch and Cape International sell
units, but they are pretty dear.  I was wondering if anyone else had looked
into a good candidate

master cylinder from a local parts house like NAPA or AutoZone?  How does
one determine what size master cylinder bore to look for?  There must be
some calculation

between the Master cylinder and the wheel cylinder bore sizes.  I plan to
use the original drum brakes (at least for now), I want to keep the MC
location on the frame rail, and

I don't want to use a booster.  Has anyone given this any thought?

Oh, by the way, the wheel cylinder that failed on the Rover was nearly new.
It was not a Girling but rather one of the newer knock-offs.

TIA for any input.
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