Vacuum brake booster is defective or the hose going to the booster is leaking.
Your power brake booster may be defective. You may have a vacuum leak or the booster itself could need replacing.
brake booster vacuum leak,or bad brake booster.
A bad brake booster will cause a vacuum leak, result in poor braking, and even poor engine performance. The brake booster has a large diaphragm which can fail and leak.
No, a busted brake booster will not cause the brake pedal to go to the floor. It will however cause the brake pedal to be extremely hard to push. A defective master cylinder will cause what you describe. Replace the master cylinder and bleed the brakes. It can because it happened to me. The booster lost vaccum and the pedal went to the floor. Sorry, you are wrong. The only reason the pedal went to the floor was because the master cylinder failed. The brake booster only boosts the pressure on the master cylinder and allows you to not have to push so hard on the brake pedal. Cars of yesteryear did not even have a brake booster and they stopped just fine albeit you had to push the pedal allot harder than with power brakes. A failing brake booster will not cause your pedal to go to the floor although it might cause it to go lower than normal before the brakes apply. As long as the master cylinder is good you will still have brakes, but you will have to really push hard and might even have to pump them up in order for them to stop the car.
Warped brake rotors.
I have a leak in the brake booster in side the cab. it sound like it is sucking sound and i move the rubber boot and it slows down or stops. can this cause any brake problems.
As you said when you tramp brake engine idles ruf and then cuts out 2 things 1 return valve in brake vacuem pipe from intake to booster 2 Brake booster sucking air
parking brake on.
Probably cause by a worn out/defective brake light switch.
Brake light switch either out of adjustment or defective Should be located at upper end of brake pedal under dash
Bad brake booster.