Question about 2005 Ford F-150

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F150, 2000, problems with brakes

What is happening when I want to brake, and the brake pad goes nice and smooth, and then in a minute the brake pedal is so hard to push. Also I hear a clunking noise when I brake, and feel that the car is still going when braking. The brake pads are fine. Help!!

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Sounds like the vaccum booster is bad. check vaccum line going to booster for cracks. vaccum booster is located behind master cylinder.

Posted on Dec 15, 2008

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2 Answers

What is the problem?


If you step on the brake pedal and hold it down and you feel the pedal going slowly down, that's for sure your Master Cylinder unless you have a brake fluid leak from one of the calipers. If you have a brake fluid leak, you will notice it because you will have to keep on adding fluid to the system. If you notice a change in your RPM when you brake then you may have an air leak from your vacuum to manifold hose.

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the condition you have experienced is called brake fade . It occurs when there is insufficient brake pad to adsorb the heat generated buy the changing of the kinetics energy (spinning) into heat energy by the friction of the brake pads on the disc rotors.. It gets to a point where the pads and discs will not take any more heat so when that happens it does not matter how hard you push the pedal there will be no brakes. To prevent this happening again fit new brake pads and fit new disc rotors. If you are going to be doing steep hill work then get a brake pad suitable for hard work. Talk to a brake shop specialist to get the best pads for the job. Another experience that you will have is when the brakes get hot the pedal goes to the floor. This comes from bad brake fluid and happens when the brake fluid absorbs moisture from the air and the boiling point of the fluid is lowered considerably. The oil boils and the water in the oil turns to steam and you get vapour lock in the system and you will loose brakes as you are compressing steam or air.. The fix for that is to ensure that you change your brake fluid every 12 months.

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Another cause may be warped (bent) rotors, the pads can be pushed back into the calipers by the off center area of the rotor. This means that the pads have to travel further in order to contact the rotors when you press the pedal.

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2008 mailbu After braking hard (coming off of freeway on to the service road) and then using the brakes a block later the rotors seem to have warped. After a few blocks the problem goes away. The rotors...


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Did you bleed the lines and master cyl. If you are talking about the flex lines that connect to the caliper, did you make sure that the fluid did not
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If the master cyl did not empty you will just have to bleed the lines again,
have someone help do do this. If you don't know how, just post it
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After driving for around 30 minutes, the brake


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You may want to go to your local library and check out a Chilton's, or some other repair manual for the "how to" to fix yourself or take it to a tech you can trust.

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are your rear drums set up? why did you bleed the brakes. when only when you installed new pads?

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