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Tippy Tippy is offline
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,221
The brake booster is not designed to work under pressure, only vacuum. When you boost a car, you need to put a 1-way check valve so the line leading to the brake booster never goes over ambient atmospheric pressure.

Once the 1-way check valve has pressure put on to it, the valves close shut so you don't potentially rupture the brake booster diaphragm.

Last edited by Tippy; 05-12-2017 at 05:13 AM..
Old 05-11-2017, 05:35 PM
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