Sounds like the power brake booster has a vacuum leak.
I would say a power brake booster or a brake booster would be the same.
Could be a vacuum leak in or at the power brake booster
sorry I'm not sure how
The brake booster is part of the power brake system.
The power brake booster of a vehicle is replaced by removing the fluid reservoir, unbolting the booster from the firewall, and disconnecting it from the brake pedal. A new booster can then be connected and bolted into place.
It's the "power" in your power breaks.
The power booster check valve would be located where the vacuum hose is connected to the booster. The vacuum hose is connected to the valve and the valve is inserted into the booster. They are usually made of plastic.
Check for a vacuum leak Could be the check valve at the power brake booster
Power booster failure or vacuum supply to booster failure.
The power brake booster on a 95 Chevy Blazer is replaced by draining and removing the master cylinder, unbolting the booster, and removing it from the vehicle. A new cylinder is then put in its place and bolted on.
BAD power brake booster are a vaccum leak at the booster.