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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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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I have a 1990 GMC Suburban 2500 that has a soft brake pedal which just started happening yesterday. It will stop; however brake pedal goes all the way to the floor. Have added brake fluid with no change....

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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,
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