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Check the boost pump behind the brake master cylinder. Pump brake pedal til hard, maintain pressure. Start truck. Pedal should drop about inch or two. More boost pump bad. Disconnect and plug the hose going to boost pump. , Press brake, Start truck. Should be super hard. Change boost pump
from your description , the problem is in the brake booster
nothing should have popped out as boosters either have the link back to the pedal or a rod from the pedal that goes into the booster
the valve as you call it could be the unit that controls the amount of vacuum needed to operate the booster diaphragm and with that not operating correctly you have no boost assist for the pedal
to test your brake assist is working. stop the motor. Press w few times the brakes, till the pedal feels sturdy. Then while pressing the pedal down firmly, start the engine. When you feel the pedal going down, like feeling "soft" you know the brake assist works. If nothing changes it is defect.
Hello deepockets4: My name is Roger and I will help with your question. With the engine off depress the brake pedal 5 or 6 times. After doing this hold down the brake pedal and start the engine. The pedal should fall about 1 1/2 to 2 inches from where the pedal was. Should the pedal not drop you have a vacuum problem. If you have a hydra-boost brake system this check will not work. A Hydra-boost brake system does not have a brake booster. This system uses the power steering pump as the assist on the brake system. With the hydra-boost system the pedal will go all the way to the floor but you would have already put your nose to the windshield. For the hydra-boost system to fail you generally will have a power steering leak or pump failure. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger