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Re: how can i know when brake booster is not working
In most cases if the power brake booster is bad, The brake pedal is very hard to push down. You may know it is starting to go bad if you hear a hissing/sucking noise when pushing the brake pedal. Hope this helps
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I don't if that differs between manufacturers? I looked at rockauto.com for your brake booster, cardone part for your vehicle lists 97--2005 for your vehicle, brake booster.
If all the hook-ups are the same as the one your looking at, I don't know why it wouldn't work?
You know how it is, I see nothing from here.
check it actually has vacum at booster,if it has check seals installed behind master cyl and ahead of brake pedal.
if above checks out and theres no hissing when you step on pedal someone screwed up booster rebuild
If you have not checked the large vacuum hose that runs from the intake manifold to the brake booster, or the one way check-valve the hose connects into the booster with, please do so before rearranging your budget. If the hose or valve are dry rotted, cracked or not sealing tight at the ends, replace them and see what the booster does.
Also, the booster will usually make a continuous hissing sound if its bad.
It may be the master cylinder is bad.
As a rule, if the brake pedal goes to the floor with little or no effort, it's the master cylinder.
If you have to stand with both feet on the brake pedal, gripping the steering wheel to stop, its the brake booster 90% of the time. The other 10% is the master cylinder.
Hope this is clear as mud! and helps... let me know.
Find a way to pressurize the booster. At the suction port of the booster you would have to fabricate a tire valve and maybe install an air gauge to see if air is leaking out. Remember there is a rubber bladder inside the booster. If air is leaking around the rubber diaphram then the brake booster will not work. Did you check the hose and valve going to the brake booster? If you have a vacuum leak, then the booster will not work. Was your master cylinder leaking inside the brake booster? When brake fluid leaks inside the booster the brake fluid will destroy the rubber diaphram.
the booster is the problem, or a hole or leak in vacuum line to booster check the check valve also ! from manifold. heres the symtoms of a bad brake booster. primary symtom is a hard pedal on application, to test booster. pump brakes several times with engine off. to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should feel the pedal fade away abit and then become firm. but not hard. if you feel nothing at pedal when engine starts, brake booster is not working! check the vacuum lines first!!
Yes , for sure. A haynes manual is a must have for anyone who wants to do work on their own car. It will save you hours of frustration and unnecessary work. WELL worth the cost.
When you say the booster is going out , are you sure ?
They work of a vacumme hose from the engine , if that hose is leaking , or the little valve where it goes into the booster is no good , than you might think the booster is bad when it is good.
In general terms either the booster is good , or it is bad and you have to stand on the pedal to get any brakes.
If you post more info about what your brakes are doing , or not doing , someone might give you a different solution / diagnosis.
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
jcakey: My name is Roger and I will answer your question for you. From what you describe the problem sounds like a bad vacum brake booster. A simple way to check is to do the following. With the engine off. Press on the brake pedal 4 or 5 times. This will deplete all vacum in the booster. Next start the engine while holding your foot on the brake pedal. The pedal should drop a couple of inches. If the pedal does not drop. The problem is the brake booster. When the booster is bad you will hear a hissing sound inside of the truck when you apply the brakes..
If the master cylinder is faulty you will wave mushy brake to no brakes.Your ABS and brake failure lights will be on. Should you need further help please just ask. I will be glad to help you. Please rate this answer as this is how we know your answer was useful.Thank You for using Fix Ya. Roger