[Healeys] Girling brake boost ratio

[Oudesluys]

The amount of boost depends on the vacuum. when you press the brake 
pedal with the engine switched of and start the engine up you will feel 
the pedal going down slightly as the vacuum builds up.

Kees Oudesluijs



Warthodson at aol.com schreef:
> As I understand the servo, vacuum pressure is applied to both sides of 
> the piston. It is atmospheric pressure  that creates the "boost". Does 
> the boost really vary with the amount of vacuum or is it a function of 
> atmospheric pressure?
> Gary Hodson  
>  
> In a message dated 8/20/2009 12:56:32 P.M. Central Daylight Time, 
> coudesluijs at chello.nl writes:
>
>     I would check the non return valve of the servo. The brake force
>     should
>     be max when you slow down on the engine creating max. vacuum.
>     Kees Oudesluijs
>
>
>     Mark Schneider schreef:
>     > Listers,
>     >
>     > Questions about the Lockheed replacement servo.  I have had one
>     in my
>     > BJ8 for several years.  Every once in awhile the brakes seem to
>     grab
>     > somewhat harshly at the very end of a  deceleration and stop. 
>     Usually
>     > it releases as soon as I remove my foot from the brake pedal. 
>     > However, occasionally as I then begin to accelerate from a stop
>     I can
>     > feel a slight drake and a release of the brakes.  Can anyone
>     explain
>     > this?  Does anyone have a Lockheed manual?
>     >
>     > Marks 3
>     > '66 BJ8_______________________________________________
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