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Home > Forums > Automotive Engineers > Activities > Transmission, Driveline, Hybrid Drive engineering Forum

Brake servo boost ratio and diaphagm size.

thread78-309276
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Komodo86 (Mechanical)
26 Oct 11 10:59
I appreciate the boost ratio is not fully linear, however seeing as boost ratio is often noted in brake calculations, is there a way to determine it from the size of the booster and the applied vacuum?

I have a dual diaphragm booster with a total of 88sq.in with ~11.3psi vacuum (~28inHg) that I am trying to find the ratio for.
ccfowler (Mechanical)
29 Oct 11 22:43
The available "vacuum" serves to limit the boost ratio, but the real boost ratio is determined by the details of the design of the boost mechanism and control valves.

Valuable advice from a professor many years ago:  First, design for graceful failure.  Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs.  Only then can practicality and economics be properly considered.

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