[Healeys] BJ8 Brake booster fail locks brakes on

[Bob Spidell]

Haven't experienced this particular Healey joy (yet), but Alan's diagnosis sounds very likely.

In addition, the large vacuum cylinder is lined with a magical 'dry lubricant.'  Along with a too large/firm/stubborn 
seal, this lubricant may  be eroded enough to contribute to the problem, and should be restored.  I used one of these 
products (most likely, the 28A):

http://www.sandstromproducts.com/air-dry.html

Unfortunately, this stuff is beau coup expensive, and has hazmat shipping requirements.  One can would probably do 20 
boosters, and it expires after a couple years.

I don't know if there's a definitive way to tell if the lubricant should be renewed, but if the booster has over 100K 
miles it may need it.

Bob


On 5/23/2012 3:28 AM, healey.nut at gmail.com wrote:
> Chris -
>
> The rubber seal used under the leather seal of the vaccum piston needs to be cut in about half.  The leather seal only needs a slight amount of pressure from the rubber to work properly.
>
> Many kits use a rubber seal that's either too firm or too big, and it causes the piston and the can to lock shut.
>
> Very common problem for years.
>
> Hope that helps.
>
> Alan
>
> Sent from my BlackBerry. smartphone
> www.blackberry.com
>
>
>


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Bob Spidell           San Jose, CA            bspidell at comcast.net

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