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## Re: [Mgs] MGB rear brakes

 To: MG List Re: [Mgs] MGB rear brakes Max Heim Tue, 24 Feb 2009 10:55:30 -0800
 ```on 2/24/09 10:11 AM, Simon Matthews at simon.d.matthews@gmail.com wrote: > Max, > > It's not quite so simple. This description of dual master cylinders > describes a balance bar used to ensure equal force is applied to each > cylinder: > http://www.hotrodheaven.com/tech/brakes/brakes3.htm > In this scenario, the balance bar would act to equalise the pressures > between front and rear. Also, are not some brake systems split > diagonally? Balance bars are used in race cars (which are invariably disc/disc). I was talking about tandem dual MCs as used in almost all production cars. While I have heard of diagonally-split systems in theory, I cannot think of a single real-world application. I am sure someone will speak up and enlighten me. > > This patent describes a tandem dual-master cylinder setup in which the > two circuits also have equal pressure: > > http://www.tpub.com/content/construction/14273/css/14273_248.htm I can't tell from this fragment how this applies to the argument, if at all. Anyway, I am not just arguing from a theoretical standpoint, here -- I am describing reported real world experiences with examples of applications. You can say what you want, but there seems to be a generally-held belief that using larger diameter rear wheel cylinders on tandem MC disc/drum brake systems has the effect of reducing rear wheel lock-up, particularly for vehicles with strong front weight bias. > Regards, > Simon > > > On Tue, Feb 24, 2009 at 9:31 AM, Max Heim wrote: >> But in a dual master cylinder system, it is possible to meet resistance in >> one circuit before reaching that point in the other circuit (for example, in >> the case of a failed hose in one circuit). The pressure does NOT equalize >> between the completely independent circuits. So my argument is that by using >> larger wheel cylinders in the rear brake circuit, you are delaying the onset >> of braking force in the rear circuit, by requiring more fluid to be moved in >> order to reach the point of applying braking force RELATIVE TO THE FRONT >> CIRCUIT. Now do you see what I mean? >> >> I think we have established that single and dual master cylinder systems >> behave very differently in this respect, so that one needs to be careful in >> defining the question. >> >> -- >> >> Max Heim >> '66 MGB GHN3L76149 >> If you're near Mountain View, CA, >> it's the primer red one with chrome wires >> -- Max Heim '66 MGB GHN3L76149 If you're near Mountain View, CA, it's the primer red one with chrome wires _______________________________________________ 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 ```
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