Except GT cylinders are larger: .870 vs .800 for the Tourer.
Allen
From: Rick Morrison <gofastmg@juno.com>
>
>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
>>>
>>
>
|