brake booster

A brake booster is a component in a vehicle's braking system that helps increase the force applied to the master cylinder when the brake pedal is pressed, making it easier to stop the vehicle. It uses vacuum pressure from the engine to assist in applying the brakes.
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    Brakes Brake Booster troubleshooting

    Pretty sure i have a bad booster, but wanted to run through my troubleshooting to be 100%. Hard pedal, hard to stop. Pedal hard when not running, start up, drops a little and softens a bit. I've smoke tested the vacuum system with line to booster plugged....absolutely no leaks. Check valve...
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