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you need manifold vacuum for the brake booster.. (intake manifold)
From the booster, to a vacuum source on the engine.
the brake vacuum booster connects to the intake manifold all by itself and the PCV valve hose should hook directly to your carburetor.
insufficient vacuum. The vacuum is part of the brake booster. First thing to check is a defective or leaking hose in the brake vacuum system.
It could be a leaking vacuum hose to the power brake booster or the membrane in the booster could have a hole. When the brakes are applied, the booster is opened to the engine vacuum via the hose. The vacuum leak would then increase, causing the engine to stall.
Did you check the Power Brake booster vacuum hose? Also the booster itself make have a busted diaphragm.
if it is hard to press on the brakes it usually indicates that you have a malfunctioning brake booster. Since brake boosters are vacuum assisted, it could also be that you have a disconnected vacuum hose or a leaking hose.
unbolt master cylinder from boosterdisconnect pushrod at brake pedal arm under dashdisconnect vacuum hose from boosterunbolt booster from firewallreverse order to install new booster
You may have a brake booster that is leaking. The diaphragm may be busted. You will need to remove the brake booster vacuum hose and do a vacuum bleed down test. If the booster will not hold vacuum it needs replacing.
Normally the vacuum line from a brake booster goes to the intake manifold of a gasoline engine. Sometimes other lines will be tied in to feed vacuum to cruise control pots or 4x4 actuators, but the main hose will be larger.
Mounted between the Master Cylinder & the Firewall on the driver's side. It is the large vacuum diaphragm with the vacuum hose going to it.
The hose going to the brake booster is a great place to test vacuum.