Actually Rick, the GT cylinders are larger in diameter. But they do
exert less force on the shoes.
Bill
Rick Morrison wrote:
>
> Actually no, Paul.
> GT cylinders, being slightly smaller in diameter, exert less force on
> the shoes, vs roadster cylinders.
> The reason for that was the additional 200 odd pounds more on the GT is
> above the location of the Roadster CG, thus raising the GT's by a small
> amount, but enough to change the weight transfer under braking (and all
> other manuvers for that matter). This additional weight transfer
> increased the likelyhood of rear wheel lock-up.
> By reducing the force at the rear shoes, rear wheel lockup is dimished.
> The total braking force on the system is the same with the roadster and
> GT. The GT just distributes a greater portion to the front.
>
> Rick Morrison
> 72 MGBGT
> 74 Midget
>
> On Fri, 2 Apr 1999 16:31:11 +0100 "Paul Hunt" <paul.hunt1@virgin.net>
> writes:
> >GT wheel cylinders give *greater* braking effort to cope with the
> >additional
> >weight, that is why roadster backplates and wheel cylinders have
> >different
> >peg arrangements.
> >
> >PaulH.
> >http://freespace.virgin.net/paul.hunt1/
> >
> >-----Original Message-----
> >From: Bill Schooler <schooler@erols.com>
> >To: xyzabcde@earthlink.net <xyzabcde@earthlink.net>
> >Cc: Charley & Peggy Robinson <ccrobins@ktc.com>; mgs@autox.team.net
> ><mgs@autox.team.net>
> >Date: 31 March 1999 13:25
> >Subject: Re: Wet brakes don't work, Part II
> >
> >
> >>Denise,
> >>
> >>I have always been amused by some of the "puffery" language used by
> >VB
> >>in their catalog. "Upgraded" rear wheel cylinders are nothing more
> >than
> >>the wheel cylinders for GTs. Different internal diameter yields
> >>different braking pressure.
> >>
> >>For your info file - in 30 years of driving the same MGB, only once
> >did
> >>I experience weak braking from water. This occurred during an
> >extremely
> >>heavy rainstorm, with lots of standing water on the road. Upon
> >>application of the brakes, braking from the front was ineffective
> >until
> >>the pads wiped away enough of the water to grab. The effect was
> >>momentary and normal braking was restored rather quickly.
> >>
> >>I'll be most interested in what the probem is.
> >>
> >>Bill
> >>
> >>xyzabcde@earthlink.net wrote:
> >>>
> >>> Hi Charley,
> >>>
> >>> The reason I haven't tested any part of the brake system at this
> >point is
> >that I
> >>> have 20 years and 200K miles of driving data to work with. In that
> >time,
> >I've
> >>> verified many times that all portions of the the brake system work
> >and
> >nothing
> >>> has changed lately. I asked for the list wisdom on this one before
> >I did
> >much
> >>> investigation because I wanted to know which I would be looking
> >for--a
> >problem
> >>> with my car, or a design defect.
> >>> Now that I know that I'm looking for relative braking power between
> >the
> >front
> >>> and rear brakes, I know what I need to do to test it, including
> >what you
> >>> suggest. I know that there's no major failure in my braking
> >system, but
> >>> something is marginal and I plan to quantify it before I change
> >anything.
> >>>
> >>> However, I was looking through parts catalogues today, and
> >discovered
> >something
> >>> that suggests that this may just be "the nature of the beast."
> >Victoria
> >British
> >>> offers upgraded rear wheel cylinders. Here's what they say:
> >>>
> >>> "Under heavy braking, MGB roadsters and all MGC's have a tendancy
> >for the
> >rear
> >>> brakes to lock up. Replacing them with upgraded rear wheel
> >cylinders
> >reduces
> >>> the rear brake pressure and creates a better balance between front
> >and
> >rear
> >>> braking."
> >>>
> >>> If I can't find anything that would diminish the braking power of
> >the
> >front
> >>> brakes, I may try these wheel cylinders. However, I still like the
> >idea
> >of an
> >>> apportioning valve so I can adjust the balance to any value, but
> >that
> >would
> >>> require major replumbing.
> >>>
> >>> Thanks for the suggestion and send along any others you have. I'll
> >let
> >the list
> >>> know what I find.
> >>>
> >>> Denise Thorpe
> >>> BTW, black widow spider webs are tougher than other webs, so I can
> >tell
> >by feel
> >>> when I'm in danger.
> >>>
> >>> Charley & Peggy Robinson wrote:
> >>> >
> >>> > Hi Denise,
> >>> >
> >>> > Have you jacked up the front of the car and tested the front
> >brakes
> >to
> >>> > see how they work? Forgive me if I've missed something but all
> >I've
> >>> > seen is conjecture.
> >>> >
> >>> > CR
> >>
> >
>
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