98 Ford F-150 Causes for low brake pedal?

My Ford F-150's brake pedal will almost hit the floor before it comes to a stop

It has new rotors, pads, master cylinder and booster

Does anyone know how this happens or how to fix it?

12 Answers

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  • 1 decade ago
    Best Answer

    Several posibilities and things to check....did you do the work yourself?? Could be alot of things...Sounds like possible air in the lines..youll need to bleed the brakes. Vehicle not running, have someone sit in the drivers seat and you find the brake fluid release valve under the driver side front tire...have your wrench on the closed valve. Tell the person in the seat to vigerously pump the brakes about 10 times or more until they become hard...tell them to hold the brake down hard at the last pump and keep pressure on the pedal and follow it to the floor as you open the valve for about the count of 6 then close it...repeat this process about 3- 4 times on all tires. Be sure and check the brake fluid before starting the next tire...it should be full, and be sure and put the lid back on the resoviour tight or you will just be spinning your wheels.

    If that doesnt fix it...there is a metal clip on the rubber part of the brake lines holding the line in place each tire should have one...sometimes if that is crimped on too tight the fluid is not getting to do its job...just loosen the grasp around the rubber line just a hair to allow better fluid flow, be careful not to puncture the line.

    and then there is check all the boots on the calipers sometimes they will roll when they are bieng put on and you wont even know it...

    depending on wether or not you did the work yourself..here are a few questions...did you fill the booster with fluid before putting it on?...did you fill and pump the master cylinder with fluid before putting it on? Did you completly compress the calipers before you put them on ?

    curious as to what prompted you to change all these components out...if it was doing the same thing as before you replaced this stuff, you might check those brake lines...sometimes they can come apart internally and collapse inside everytime you brake...leaving you with none!

    hope some of this helps

    Source(s): Love workin on cars
  • 3 years ago

    Low Brake Pedal

  • Anonymous
    4 years ago

    This Site Might Help You.

    RE:

    98 Ford F-150 Causes for low brake pedal?

    My Ford F-150's brake pedal will almost hit the floor before it comes to a stop

    It has new rotors, pads, master cylinder and booster

    Does anyone know how this happens or how to fix it?

    Source(s): 98 ford 150 brake pedal: https://biturl.im/ikLmY
  • 1 decade ago

    Lack of brake pressure is another issue that may occur when it comes to the brake system of your vehicle. You can tell when this occurs because when you press on the pedal that controls the brakes in the car, you find that the pedal easily goes straight to the floor. There are typically three issues that may be occurring, ranging from a mild issue to a severe complication that may result in hundreds of dollars in repairs:Now to fix this problem my friend The first thing that you will want to do is check the brake fluid in the automobile. There is a reservoir that sits atop the master cylinder, or maybe to the side. Ensure that brake fluid goes all the way to the fill line. If it doesn't simply add more fluid.

    2. Now, there may come a situation in which air actually enters into the brake fluid in the reservoir and works its way into the brake lines and moves throughout the system. This can be a challenging situation. The best solution for this problem is to take the brake system and "bleed" them.

    3. The most complicated and expensive of all possible scenarios is that the actual master cylinder component of the brake system may be faulty. There is no quick fix or easy repair kits for this situation. You will need to actually replace the master cylinder, and this is not cheap - especially if it is professionally done.

    Source(s): Years of Experience Grease monkey
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  • 1 decade ago

    There must be air in the lines. Bleed the brake lines out. There should be at about 2" from the floor at full depression. Coming to a stop is irrelevant. The brake must not be spongy, if so then air in lines for sure. If the pedal is hard and not spongy then the calipers might require cleaning. FOrd uses a floating caliper that relies on the free floating ability of the caliper itself. The slide track must be free and clear allowing for sliding to occur. If not then the caliper may return too far and require more throw to accomplish adequate pressure for proper braking.

  • 1 decade ago

    Sometimes after replacing a Master cyclinder, there is a good chance that you have air trapped in the breaklines where they were disonnected from the old master cyclinder, If the brake lines have air in them then you will need to get the brake system bled. If the rear brakes are Drun Barakes, could be that you need to have them adjusted up or replaced as well. If you did not Bench Bleed the master cyckinder before installing it, them most likely you have air in the system...

  • ingles
    Lv 4
    3 years ago

    F150 Brakes

  • 1 decade ago

    just sit in park and step on the brake pedal. check the drop. now pump the pedal a couple of times and see it it is higher and holding. if it drops there is air in the system--bleed them. if they stay up then believe it or not the rear brakes are out of adjustment. pedal height is dictated by rear adjustments. asuming they are drum rears. if 4 wheel disc it will require a little more effort to accomplish and you might want to consider a shop

  • 1 decade ago

    if those parts are brand new the brakes need a little time to break in for the rotors and pads, also could just need to get the brakes bleed better cause could be air in the lines, also keep checking the brake fluid level, if it keeps getting lower then its a leak somewhere in the lines

  • 1 decade ago

    check your brake fulid or take it to a shop ASAP

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