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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
if you have a replacement part look into the middle of the booster with a flash light you'll see a round metal clip that locks the pedal to the booster if you get someone to help you one of you can hold the pedal now get some thing to pry it away from fire wall ,or first pull booster out as far as possible put a block behind it to hold it out and pull up on brake pedal HARD you should feel a pop or sudden release ,a dot of grease on brake pedal linkage rod will help install new one ,when you put in new one after reassembling it to firewall step on pedal and you'll feel it pop back in. good luck hope I helped .Woody
_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.
You may have lost you brake assist. Look for any disconnected or broken hoses and vacuum leaks especially the one going to the brake booster. make sure that the check valve is good it should allow air through in one direction but not the other. if all checks out good apply vacuum to the power brake booster and make sure it hold if not replace the power brake booster.
nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.
Hello moonc40: My name is Roger and I will help. With the engine off step on the brake a couple of times. Hold your foot one the brakes and start the engine. The pedal should drop a couple of inches. If it does not then your vacuum booster is most likely the problem. With out the booster assist your brake pedal will be extremely hard to push. If you hear a hissing sound inside of the vehicle when the brake pedal is pushed? The problem is the booster.Should you need further help please just ask. Please rate the answer this way I know it was helpful. Thank You for using Fix Ya. Roger
a defective master has just one common symptom, a soft sinking pedal.
Things You'll Need:
Ratchet and socket
Slip joint pliers
New cotter pin
Removing the Old Brake Booster
Park your car in a safe place with enough room to work around the front and driver side of the vehicle.
Locate the booster push rod connected to the brake pedal.
Remove the cotter pin securing the booster push rod pin to the brake pedal using a pair of nose pliers.
Release the push rod pin from the brake pedal and slide the push rod off the brake pedal.
Unscrew the four mounting nuts off the brake booster studs using a ratchet, ratchet extension and socket. You should be able to see the four booster studs extending through the firewall, in front of the brake pedal.
Disconnect the vacuum hose from the brake booster, working from the engine compartment. Use a pair of slip joint pliers.
Remove the two nuts holding the brake master cylinder to the brake booster. Use a wrench or ratchet and socket.
Separate the brake master cylinder from the booster just enough to make room for booster removal.
Pull the brake booster off the firewall and remove it from the vehicle.
Installing the New Brake Booster
Set the new booster in place by sliding the push rod and four mounting studs through the mounting holes on the firewall.
Slide the brake master cylinder flange over the two mounting studs on the brake booster.
Start the two brake master cylinder mounting nuts by hand to avoid damage to the threads.
Tighten the two brake master cylinder mounting nuts using a wrench or ratchet and socket.
Connect the vacuum hose to the brake booster.
Screw the four mounting nuts to the brake booster working from inside the vehicle. Start the nuts by hand to avoid damaging the threads.
Tighten the four mounting nuts using the ratchet, ratchet extension and socket.
Position the brake booster push rod over the brake pedal and slide the push rod pin.
Install a new cotter pin to secure the booster push rod to the brake pedal