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Re: [Mgs] MGB rear brakes

To: Barney Gaylord <barneymg@mgaguru.com>, MG List <mgs@autox.team.net>
Subject: Re: [Mgs] MGB rear brakes
From: Charles & Peggy Robinson <ccrobins@ktc.com>
Date: Fri, 27 Feb 2009 00:11:12 -0600
Charles & Peggy Robinson wrote:
> I'm sorry Barn, but I can't agree.  Look at it.  If the master and the 
> slave were the same size, the slave would move the same amount as the 
> master for a given displacement and the force would be 1 to 1  If the 
> slave was twice the diameter of the master, the force at the slave would 
> be doubled but the travel would be halved.
> 
>   CR
> 
> Barney Gaylord wrote:
>> At 03:22 PM 2/25/2009 -0600, Charles & Peggy Robinson wrote:
>>> I'm aware that if you increase the size of the slave cylinder you get 
>>> more force multiplication but less movement for a given displacement 
>>> of the master piston.  That's all I said.
>>> ....
>>
>> You never get less movement.  You get slower movement, more fluid 
>> flow, and longer pedal travel until the shoes move the same distance 
>> to come into contact with the drum.  When it stops moving you get 
>> higher force from the hydraulic pressure on the larger piston.  Ergo, 
>> more braking force on the rear wheels and possible rear wheel lockup 
>> (after longer pedal travel).
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