BAS Pressure Build-Up, Function

Legend
Illustrated: BAS Brakeing
A7/7 BAS Brake Booster
y1 BAS Solenoid Valve (Control Valve)
a Atmospheric Pressure
c Vacuum

BAS Pressure Increase
The conditions for switching on BAS braking are met, the BAS solenoid valve (y1) is open. Atmospheric pressure acts on the back of the rolling diaphragm. The pressure difference between the back and front side of the diaphragm causes maximum brake boost.





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