Reply to "Pantera Power Brake Booster"

jb1490Member

Doug,

The external check valve "seals" the booster's vacuum chambers whenever the engine's vacuum is lower than the chambers' vacuum.

The booster has internal control "valves" that are actuated by brake pedal movement. One valve opens / closes a vacuum port in the passage connecting the front and rear chambers, and the other valve opens / closes an atmospheric port.

With the brake pedal released (no pressure applied to the pedal), the vacuum port is open so that the vacuum is equal on both sides of the diaphragm. Front and rear chambers have equal vacuum. The second valve closes the atmospheric port so that (hopefully) all of the vacuum remains in the two chambers.

When the brake pedal is applied, the vacuum port closes, thus sealing the front chamber from the rear. When the vacuum port is closed, the atmospheric port begins to open, allowing the vacuum in the rear chamber (brake pedal side) to bleed off.

John

1/23/1311:30 AM

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