Replace fuel pressure regulator.
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.
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
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.
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.
Your power brake booster may be defective. You may have a vacuum leak or the booster itself could need replacing.
Vacuum brake booster is defective or the hose going to the booster is leaking.
Bad brake booster.
The cause of hard brake pedal is malfunctioning brake booster. Check the hose from the intake manifold going to the brake booster for cracks or leakage, replace if necessary. Check the one way valve located in the middle of that hose, make sure the valve opens when you put pressure on one port.. If all those mentioned are ok, the booster itself needs to be replaced....
Your brake booster is malfunctioning
Check your battery terminals. If there is a loose connection or corrosion on the terminals it can cause the brake booster to malfunction due to lack of power to the vacuum sensor.
I wouldn't repair any brake parts unless I am a professional mechanic. Brake boosters can be very difficult to replace and if they are not replaced properly, it can cause a serious accident.