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Re: poor functioning brakes
Posted by Cort D (more from Cort D) on Mon, 1 Jan 2001 14:46:57
In Reply to: poor functioning brakes, Stephen Hartsell, Wed, 27 Dec 2000 00:22:05 
Re: acumulator

Interesting, my shop manual, 5:2 ABS braking system, page 500-9 states in
part:

stores the 
pressure... Brake fluid acts on one 
conected to a sealed chamber containing nitrogen...

Now it has been a real long time since I studied fluid dynamics, however
as the normal operational pressure of the accumulator is 2030 - 2610 PSI 
 if the nitrogen was not pressurized prior to instalaation you might as
well not have any.  If my memory is correct, and it has been a long time
since I cracked these books, at a given volume,  lets say 2, if you have
an initial gas charge of 20 psi and then put  fluid in to a pressure of
40 psi the gas now occupies  a volume of 1.  If we do the math on a non
charged (atmospheric) area (volume) then introduce a fluid pressure of
say 2500 PSI we can see how much space is now occupied by the gas.
remember you cant compress a fluid.

Though I have not looked further I assume that the initial nitrogen
charge in the accumulator would be at least 1/3 to 1/2 the working
pressure, as is normal in most fluid (pressure or energy) accumulators.
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