Hmmm, that is only if you assume a one-to-one relationship between brake
pedal pressure and volume of fluid sent to the rear brakes. But I don't
think that's true. What I would expect is a one-to-one relationship between
pedal pressure and line pressure -- if it takes more fluid to achieve the
same line pressure, it moves more fluid. Then, in the larger diameter brake
cylinder, the same pressure being transmitted across a larger area (of the
brake piston) would apply a greater force to the brake shoe.
Otherwise, I don't see how you explain the fact that the heavier GT used
larger cylinders.
Weight transfer under braking would be a factor of front/rear weight
distribution and spring rates, I would think, and wouldn't be affected by
anything in this discussion; i.e. it would be different for roadsters and
GTs, but more or less the same for all roadsters regardless of brake
hardware modifications.
But, then, there is a very real possibility that I don't know what the heck
I'm talking about...
on 6/28/02 5:33 PM, james at jamesnazarian@netzero.net wrote:
> I think you have that backwards. If you change to the larger GT cylinders
> you should get less rear braking force since it will take more fluid volume
> to expand the cylinders by the same amount. This Is why some sources say to
> replace the roadster cyls with GT when uprating performance. More weight
> transfer under braking means less weight on the rear end and thus less
> ability to brake so less pressure is needed.
>
> james
>
> ----- Original Message -----
> From: Larry Hoy <larryhoy@marketvalue.net>
> To: MG list <mgs@autox.team.net>
> Sent: 28 June, 2002 8:48 AM
> Subject: GT real brake cylinders
>
>
>> I would like to verify something.
>>
>> If the rear brake cylinders on a roadster are replaced with the larger
>> bore brake cylinders from the GT there should be a shift of the braking
>> relationship between the front and the back axle. Although the front
>> brakes will still be providing the larger portion of braking, changing
>> to the GT cylinders should transfer more braking to the rear brakes than
>> is provided by the roadster cylinders.
>>
>> Correct?
>>
>> Larry Hoy
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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