[urq] bomb test variation with S4 brakes?

[Buchholz, Steven]

... the IST docs indicate that the pressure in the bomb is nominally 36bar and goes up to 57bar when the relief valve opens.  

I'd say your idea for determining how much fluid the bomb holds would be a worthwhile test.  Theoretically you would expect the reservoir to return to the fill to mark once the pressure in the bomb is relieved.  You can also check the fluid level over time with the engine off to see if there isn't a leak in the brake servo and/or check valve in the valve body.  

Steve B
San José, CA (USA)
> 
> I have the stock urq master cylinder, and the bomb has the same spec as a
> 1983 BMW 733i. I don't think it says so on the one I just bought, but  in
> the archives someone mentions 100bar/0.48litre specs for this replacement
> bomb.
> 
> Are these the same specs, or close to the same, as the urq's?
> 
> My car brakes well now, so I'm not too worried, but am curious. I'll check
> to see how much ATF the bomb really holds soon, and will let the list know.
> It will probably be in the form of x cm drop in the reservoir from empty.