Graham,
Upon further review, it sounds like your "pedal to the floor" problem is caused
by
the lack of fluid, the seal in your MC might still be OK.
bs
********************************************
Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
********************************************
> Graham,
>
>
> Sounds like you may have two problems:
>
> 1) the pedal to the floor is often caused by failure of the small seal in the
>MC piston
> that allows fluid into the MC when the pedal is released then seals that
>path
> when the brake pedal is pressed. Usually, you can verify this by pushing
>and
> releasing the pedal, if the fluid falls (pedal released) and fluid rises
>(pedal pressed)
> this confirms this problem, but since you've lost your fluid you can't
>test this (maybe
> you can fill the reservoir to test this)
>
> 2) there is a seal in the servo called the "gland seal." This seals around
>the shaft for
> the vacuum piston. If this fails or gets hard and brittle fluid will be
>sucked into the
> vacuum canister. The Moss rebuild kit supplies this seal and everything
>else to
> rebuild the servo, but some Listers have had a problem with the vacuum
>piston
> sticking ... there is a special dry lubricant on the inside of the vacuum
>piston and if
> this is gone the vacuum piston can stick. There is an moly-epoxy dry
>lubricant
> available but it's expensive
>
>
> bs
> ********************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
> '67 Austin-Healey 3000 '56 Austin-Healey 100M
> ********************************************
>
> Subject: Brake Fluid Vanished Without Trace; BJ8.
>
>
>> Hi Listers,
>>
>> I have encountered a mysterious problem with my brakes. While checking the
>> brakes with the engine finally running again, the brake pedal went straight
>to
>> the floor without any resistance.
>>
>> I checked the fluid reservoir. To my surprise, the brake fluid has vanished
>> without trace. (No puddles on the floor, or any signs of leaking fluid.)
>>
>> I flushed and bled the brake system about one month ago, using Castrol
>GTLMA;
>> this was accomplished without encountering any problems, so I know it was
>> full.
>>
>> I have a BJ8 with, I believe, the original Girling Brake Servo installed.
>>
>> I have heard that the brake fluid can somehow leak into the Brake Servo. Is
>> this possible? Which component of the Brake Servo would fail to cause this?
>> Would the Moss repair Kit rectify this problem?
>>
>> If someone can please help me, I would be most grateful.
>>
>> Regards, Graham Wilkie.
>> HBJ8L / 32382
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