hydraulic brake booster (power brakes)
The type of brake system with vacum assist will have a large diameter hose from somewhere on the intake manifold to the brake booster. The type of brake system with hydro-boost will have hoses from the power steering pump to the brake booster.
In most hydro brake booster systems the pump also runs the power steering system so if the power steering works the pump is okay. It sounds like you have a master cylinder problem.
The brake booster is part of the power brake system.
If the brake booster system fails, it takes a lot more pressure on the brake pedal to stop the vehicle.
The master brake cylinder has nothing to do with the rack and pinion steering. In some vehicles the power steering box and the power brake booster share the same hydraulic power assist system.
For several years of the Chevy astro van had a power brake and power steering system that was linked together. Instead of a brake booster, the power steering pump provides power to the power brake system. Often, if the brake pedal would become hard to push, it is a power steering pump problem. Change the power steering pump and the power steering fluid and your problem may disappear.
The brake booster is what gives you power brakes. In the engine compartment in front of the steering wheel is a round black flat ball looking thing. That's the brake booster with the brake master cylinder attached in front of it. The brake booster uses VACCUM from the engine to multiply the force that your foot applies to the master cylinder. Used with power brake applications
a brake booster supplies power to the brake system. this takes the hard out of the brake pedal allowing brakes to work harder with less effort or pressure on pedal from the driver
If you have a power brake booster then there will be a vaccum line that runs to the brake booster on the firewall from the carburator. Check the booster for holes and broken fittings or buy a new booster. if no brake booster then brakes shouldn't affect vaccum
I would say a power brake booster or a brake booster would be the same.
Loosen brake lines on master cylinder. Dont take off brake lines yet! Get under steering wheel, under the dash and look by the steering column. There will be 4 nuts. Take off the four nuts. Take brake lines off master cylider. Take out brake booster and master cylinder as one unit.