[Healeys] oil pressure relief valve

[Oudesluys]

  I disagree. In a braking system the transmission of force/pressure has 
to be instant and precise so no volume of air to compress can be allowed 
as that would take to much travel from the brake pedal. The brake force 
in relation to the force applied to the pedal would not change, although 
you will never reach a decent force as the brake pedal cannot travel far 
enough. In a pressure gauge it does not matter how much oil flows in the 
line, there is plenty of it so with or without the air it will always 
indicate the same pressure: the pressure the oil pump is delivering or 
rather the opening pressure of the relief valve.
However I can imagine that without air in the line the gauge may vibrate 
depending on the design of the oil pump.
Kees Oudesluijs.
NL

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