Servo-action rocks! Now that I have both sides properly configured as
leading-shoes, the car is stopping straight and there's much more braking
power. It feels like power brakes. If you're into vectors, you can see that
the friction between the lining and the drum is adding to the piston force
in the leading shoe configuration. In the trailing shoe configuration, the
friction is opposing the piston. Now I know why my cars of yore had such
poor braking power in reverse.
Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd@insightbb.com
Cars: 52 MGTD - #17639
71 MGB - #GHN5UB254361
Member: NEMGTR #11470
NAMGBR # 7-3336
Hoosier MGB Club
Olde Octagons of Indiana
----- Original Message -----
From: "Blair J. Weiss" <blair@ifd.mv.com>
To: <Lawrie@britcars.com>; "Bob Howard" <mgbob@juno.com>
Cc: <bobmgtd@insightbb.com>; <mg-t@autox.team.net>
Sent: Monday, September 19, 2005 5:59 PM
Subject: Re: Bob's Brake Saga - Brake Cylinder Orientation Update
> Just so it's perfectly clear...
>
> http://www.mv.com/ipusers/ifd/DSC00018.JPG
>
> There is a picture of the right hand front of my car. The shoes open into
> the direction of the drum, so there is a "wedging" action. The "front"
> cyl.
> is facing towards the ground, and the rear cyl is facing upwards.
>
> Blair
>
> ----- Original Message -----
> From: "Bob Howard" <mgbob@juno.com>
> To: <Lawrie@britcars.com>
> Cc: <bobmgtd@insightbb.com>; <mg-t@autox.team.net>
> Sent: Monday, September 19, 2005 3:12 PM
> Subject: Re: Bob's Brake Saga - Brake Cylinder Orientation Update
>
>
>> Lawrie,
>> Thanks for the clarification. Now I can check that mine are installed
>> as intended.
>> Bob
>>
>>
>> On Mon, 19 Sep 2005 11:57:56 -0700 "Lawrie Alexander"
>> <Lawrie@Britcars.com> writes:
>>> Chiming in rather late here (busy weekend!) but a couple of points
>>> need
>>> making ....
>>>
>>> All four pictures on page M6 of the shop manual show right-side
>>> brakes. (The
>>> TD/TF brake hose is located behind the king pin, Bob.) From this we
>>> can
>>> deduce that the leading ends of both front brake shoes are forced
>>> into
>>> initial contact with the drum, providing what is sometimes referred
>>> to as
>>> "servo action". At the rear, the wheel cylinder floats so
>>> application of
>>> hydraulic pressure, theoretically, moves the piston downwards while
>>> the
>>> cylinder itself moves upwards, applying equal pressure to one
>>> leading and
>>> one trailing end of the rear shoes.
>>>
>>> The illustrations show the lining material going all the way to the
>>> end of
>>> the shoe at the trailing end, but leaving a space at the leading
>>> end. In my
>>> experience, not all re-lining companies follow this practice - some
>>> re-lined
>>> shoes will have linings all the way to each end of the shoe. This
>>> does not
>>> seem to compromise the action of the brakes. However, going back to
>>> an
>>> earlier question about tight linings, it is often necessary to file
>>> or sand
>>> (with proper breathing protection, of course) material off at each
>>> end to
>>> allow the linings to fit inside the drums with proper clearance.
>>>
>>> Everybody clear now? :<)
>>>
>>> Lawrie
>>> British Sportscar Center
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