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## Re: [Mgs] MGB rear brakes

 To: "Charles & Peggy Robinson" Re: [Mgs] MGB rear brakes Simon Matthews Thu, 26 Feb 2009 22:45:58 -0800
 ```Charles, Where to start? 1. If the diameter is doubled, the area of the slave piston is quadrupled, so the 1:1 movement becomes 4:1. 2. As Barney suggested, people don't push the pedal a fixed distance. Instead, they push it until they get the appropriate pressure. With larger slave cylinders, they will push the pedal further and more fluid will flow into the rear slave cylinders. For the same pressure in the primary (which equates to approximately the same braking force, since most of the braking is at the front), there will be more force applied to the rear brakes. Paul H explained that the pistons in the master cylinder are arranged to equalize pressure in the front rear. If it takes more fluid to get the pressure to equalize with larger rear slave cylinders, then more fluid will flow into the rear circuit. Simon On Thu, Feb 26, 2009 at 10:11 PM, Charles & Peggy Robinson wrote: > 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). > > _______________________________________________ > Support Team.Net http://www.team.net/donate.html > > > You are subscribed as simon.d.matthews@gmail.com > > > Mgs@autox.team.net > http://autox.team.net/mailman/listinfo/mgs > > http://www.team.net/archive _______________________________________________ Support Team.Net http://www.team.net/donate.html Mgs@autox.team.net http://autox.team.net/mailman/listinfo/mgs http://www.team.net/archive ```
 Current Thread Re: [Mgs] MGB rear brakes, (continued) Re: [Mgs] MGB rear brakes, Max Heim Re: [Mgs] MGB rear brakes, Richard Ewald Re: [Mgs] MGB rear brakes, Simon Matthews Re: [Mgs] MGB rear brakes, Max Heim Re: [Mgs] MGB rear brakes, Paul Hunt Re: [Mgs] MGB rear brakes, Charles & Peggy Robinson Re: [Mgs] MGB rear brakes, Barney Gaylord Re: [Mgs] MGB rear brakes, Paul Hunt Re: [Mgs] MGB rear brakes, Charles & Peggy Robinson Re: [Mgs] MGB rear brakes, Charles & Peggy Robinson Re: [Mgs] MGB rear brakes, Simon Matthews <=