Question about 2005 Ford F-150

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My f150 5.4 triton problem is when I barke every so often the the brake pedal from the booster makes a squeegy sound of noise every time I apply the brakes. and if I hold the brakes at a stop and push down on the brakes harder the pedal goes down to the floor further than it should. I got a booster from the savage yard and put it on without taking the master cylinder off to keep from loosing prime and it is still doing the same thing as the last booster. Could it be the ABS or just a falty booster or master cylider.

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  • 338 Answers

Not booster or master- you need to bleed brake fluid from each wheel cyclinder- you have an air bobble somewhere

Posted on May 28, 2011

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Posted on Jan 02, 2017

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1 Answer

How do I replace a brake booster on a 1998 Buick LeSabre? Brakes hold but make a whooshing when applied.


May not be the booster as some do make a noise when the brakes are applied. To test press the brakes several times with engine off, Press the pedal down hard and start the engine , the pedal should move down slightly and there should be no whooshing sound . if the above is ok so is the booster.

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_______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.

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yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

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Wooshing noise when braking; brake failure


Power brakes use a connection to the car's vacuum lines in order to make braking easier. It sounds like the seal around the plunger is leaking when it's cold outside. The plunger is the part that goes from the brake pedal, through the firewall, into the brake booster (vacuum chamber). The noise you are hearing sounds like some air leaking into the vacuum chamber of the brake booster.

If it's only happening when it's cold out, I'd probably not worry about it too much, unless it becomes a constant issue, even when warmer out. One of the drawbacks of this problem means that in order to get the same stopping power you used to have, you may have to exhibit more force on the brake pedal than when it's not leaking.

If you are worried about it, a competent shop could probably replace this seal for you, where as other "big box" shops will most likely tell you that you need to replace the entire brake booster assembly.

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Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.

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1 Answer

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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

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1 Answer

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Ive never heard of such a thing. Any vehicle ive ever driven the booster does not make that noise.. i dont know how to help you, but im pretty sure its not the booster, dont waste your money there

Jul 02, 2009 | 2004 Lincoln LS

2 Answers

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Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

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1 Answer

97 Blazer brake pedal making hissing sound


Sounds like a vacume leak from power break booster, when you loose vacume it will stall out the engine if enought vacume is lost. chk. power break booster. and hose from engine leading to booster for vacume leak, booster is under hood, break master cyl. bolts to it.

Feb 21, 2009 | 1997 Chevrolet Blazer

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