Ford F-150 - 1997-2003 :: Brake Pedal Intermittently Goes To Floor
Aug 6, 2015
The brake pedal intermittently goes to the floor on my nephew's 2003 F150 without grabbing at all. Pumping the brakes restores them, then they act normally for a while. I've replaced the master cylinder with a new Motorcraft unit, no change. No ABS codes. All rubber lines are in good shape. I'm stumped, although I suspect the ABS system somehow. I'm going to have him pull the ABS fuse and see if the problem goes away.
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I have a 2003 F-150 supercrew 4x4, was having problems with the brake pedal going to the floor, had replaced the front calipers, master cylinder and the brake booster. I have blead everything out including the rear calipers even though I didn`t touch them, the truck stops but the pedal isn't what it used to be, even when the truck is off the pedal has a tendency to go down, there is nothing leaking and not losing fluid, don`t know what else to do?
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2002 F-150 4x4 w/ 5.4 v-8. Brake pedal goes half way to floor before it starts to stop the vehicle. I have replaced and bled the master cylinder, bled out all of the calipers, and the calipers are installed correctly because the bleeder screws are at the top on all of them so no air can be trapped up there. The truck seems to stop fine, but just takes more pedal to get it to start stopping than I'm comfortable with. Could the ABS unit need bled out too? Or could it be an adjustment issue with the booster rod?
Also, something else I noticed, and it may be related..the ABS unit usually makes a slight clanking sound (like someone kicking a metal garbage can) a couple seconds after the key is turned on. I know its the ABS unit because a couple weeks ago I had a friends scanner hooked up to the truck, and I went into the ABS computer to clear the codes (have ABS light on from what I found to be a bad sensor wire on the front drivers side according to the scanner) and as soon as i cleared the codes on the ABS, it made that sound. I don't know if maybe there is something wrong with the ABS actuator, or if it's related to the brake pedal issue.
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I have a 2000 SCrew KR F150. A couple of weeks ago I noticed the brake pedal was slowly going to the floor while at a red light. I pulled over and popped the hood checked the fluid reservoir. It was full, so obviously no wheel cylinder issues or fluid loss. I haven't had a chance to tear into it yet.
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Last week my brake pedal started going to the floor when I stopped, it still stopped and felt fine on the top half of the pedal travel but then it would just slowly fade to the floor. I took it to a local shop and they said the master cylinder was leaking internally and my rear brakes were shot. I have 75,000 miles and the rear brakes were original so I told them to fix it. This is basically what I expected it to be.
They kept thinking they were getting defective master cylinders but after the two Napa parts and two Carquest parts they realized they misdiagnosed it and said I needed to take it to the dealership. I paid for the rear brake job since it needed done anyways and have an appointment for next week at the dealership. What might be causing the problem? I see no brake fluid leaks, no vacuum leaks, the booster was replaced 25,000 miles ago due to noise, no ABS light on, no CEL on, no other symptoms.
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I bought a 97 f150 4x4 last week. I was cleaning the frame up with a wire brush on a grinder and accidently cut one of the front brake lines. Seeing how this truck has only 100k on it and all oem stuff on it, I decided to replace the front brake components, calipers, pads, rubber and steel lines. Got it all back together and bleed the air out of the front brakes. But the pedal still goes to the floor. I can pump them up with the key off but when i turn it on the pedal goes to the floor. I did not bleed the back brakes becasue I assumed that the master cylinder would be divided and independent of each other- back and front. So it this just that the back brakes needs bled or do I have another issue like bad booster- everything was working well before I cut the line?
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I have a 99 F150, Regular cab, long bed, with a weird brake problem. With the engine off, the pedal goes firm about 3 inches. But when you start it, the pedal goes to the floor.
I've replaced the master cylinder, and bled the heck out of the 4 wheel cylinders. No soap. The pedal goes nearly to the floor, and does not "pump up".....but does stop the truck.
The ABS light is "on".
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acts like abs sensors could be bad. but the brake pedal goes almost to the floor, after it does it's pulsating. But the abs light does not come on. I already changed brake booster, no change!
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I don't know what's going on maybe some body can shed a little light on this. If you hold the brake pedal down for a long period of time you can feel the pedal slowly go to the floor. So no problem I'll change the master cylinder bleed everything brand new fluid. Don't drive it much we let the sister in law drive it we'll I jump back into it the other day to go to Home Depot and once again I notice it still does it. Could the hydra brake booster be bleeding by or what's else could be causing this it's driving me insane. I really can't imagine the hydra booster causing a problem but it's new to me. I was thinking about bleeding the brakes again thinking there maybe there's air but I have run 2 bottles of brake fluid through how much more??
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I just finished replacing pads, calipers, rotors, wheel cylinders & brake drum hardware on my truck along with flushing the brake fluid. The brakes work but the pedal goes almost to the floor. While bleeding them some air did come out as expected. But a couple times the master cylinder reservoir got very low on fluid. The workshop manual talks about bleeding the MC but are special fittings needed for that?
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I have a 1998 F 150 extended cab and the brake pedal is low. The front calipers and rotors were replaced last year because the left front caliper froze on and smoked the pads. I also replaced the brake booster and master cylinder because the brake booster showed signs of leaking vacuum. The whole system has been bled completely twice. After each bleed, the pedal was high and firm.
I have not found any sign of leakage and the fluid level looks ok and unchanged. The rear brakes look ok, but no work on them in last few years. Mileage is 198k. I had to hit the brakes hard on a muddy road a few weeks ago and the truck stopped straight, so the ABS seems ok. The problem is that the pedal has dropped down a few inches from where it was then the system was bled out. What to check next?
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I have a 99 f150 and it won't shift out of park. The taillights work and I tried to turn the key forward and move shifter to neutral but it didn't work. Is it the switch on the brake pedal or the interlock solenoid by the shifter?
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I just joined as I bought my '97 F-150 5.4 4X4 about 3 months ago. The dealer gave me a 6 month warranty but hasn't honored it at all and I've had one problem after another. That's another story though but right now I'm just trying to fix the important issues. The problem at hand are my brakes.
I was noticing a couple days ago (maybe I never noticed it that much as it was a new vehicle to me) that when I apply the brakes it sounds like a bicycle pump and the pedal travels nearly all the way down. It doesn't hit the firewall but I'd probably guess it has 3 more inches or less until it bottoms out. The hissing only occurs as the pedal travels and stops when the brake pedal isn't moving.
Now I'm not sure if the hissing sound is normal as I replaced the brake booster (from the junkyard though) and the new one still hisses when I apply brakes. The brakes seem to work okay, could be more sensitive it's just the pedal feels soft until it almost bottoms out like I stated before and the the brakes grab a little bit harder. What could it be?
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My dad is having problems with his truck, brake pedal goes all the way to the floor even after bleeding all the brakes and the master cylinder. The wheel cylinder didn't have clips in it and he fixed it and it hasnt changed. What do we do? Its a 1993 f150 4.9l.....
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I did a complete rebuild of my brake system in April. Drums, shoes, wheel cylinders, springs, hoses, pads, rotors, calipers, master cylinder, proportioner valve and flushed all the lines and refilled with synthetic fluid. I have made five trips from Southern California to Idaho hauling home furnishings, one trip to Oregon and one trip to Northern California since overhauling the brakes with everything working great. Now something strange is happening. The brake pedal goes to the floor with very little resistance. It isn't spongy like there is air in the lines. It just goes to the floor if you push it all the way down.
The truck stops ok but it is really scary with the pedal going down like that. You can feel when the rear brakes come on because there is a little resistance in the pedal when they come on. You can actually lock the rear brakes up and skid the rear tires. If you push the pedal down further the front brakes start coming on and if you push all the way to the floor the truck will nosedive and you will get planted in the windshield.
I wonder if the aftermarket Bronco Graveyard proportioner valve is blowing all the pressure to the rear wheels because it won't do it if you take the vacuum off of the vacuum booster. You have full pedal when the booster is deactivated and all the wheels operate normally with the exception of having to plant both feet on the pedal to stop it.
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My 1999 Toyota Tacoma (Ext Cab, 4x4 TRD) has 162K miles and now the clutch pedal intermittently sticks to the floor. I have to pull it off the floor with my toes while driving and have also felt the pedal start to pull back towards the floor on its own while the truck is in gear.
I'm looking for some wisdom as a few blogs/websites point towards a master cylinder, others say the master and slave, and my local auto shop said I need to replace the entire clutch assembly and throttle bearing. My truck is no spring chicken anymore but I'd like to keep it running for a few more years...
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After a recent front brake caliper replacement, the brakes work great except that when moderate pressure is continually applied to the brake pedal, the pedal goes all the way to the floor. While driving down the road, when the brake pedal is depressed, the brakes engage right where you expect them to, and the van stops just fine, even if the stop is extreme. There is no air in the brake lines. The front calipers have been replaced twice, the back brake cylinders replaced, the master cylinder replaced, the RABS valve replaced, all by a certified shop trying to address this issue.
I spoke with the service manager at a local Ford dealer in Seattle and he was aware of the problem and said that there is no solution. He said the brakes will work fine. He couldn't explain to me however, why this happens. If the van is not running, the brake pedal holds firm, so I assume the problem has something to do with either the ABS system or the power assist, but I can't say for sure. I can live with this since the van stops great. What is mechanically going on that allows the brake pedal to go to the floor even though the brakes are fully engaged after the pedal is depressed say a third to a half way down to the floor.
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My buddy just bought a 1992 f250 460 the brake suck the pedal goes to the floor don't know if master or the booster or the rod needs to be adjusted or what the brake look ok and it stops ???
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On my way into work this morning I had one of those everybody needs to stop NOW moments. Hit the brakes hard, really hard with wheels chirping and all, after i got mostly slowed down the pedal gave way and went to the floor. I let up and pushed again and they were fine, but at that point I didn't need to hit them that hard again. The rest of the way in they worked fine braking normally, and before hand as well.
I'm thinking the master cylinder is going bad. Any tips on diagnosing for sure?
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I am working on a e-150 van, 2005. the brake pedal fades to almost the floor with little pressure on it. I just replaced the master cylinder, bled the entire system, and it STILL fades to the floor. driving, or in park. engine running. 4 wheel disc, 4 wheel abs...
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I have a 99 F150 4x4 (5.4) 173k miles. I bought the truck from family about 6 months ago and from time to time if you stepped on the brake pedal to hard (not locking up, but pretty hard) it would feel like the passenger rear tire would lock up. He said that there was an issue with the automatic adjuster on that side. Here lately the ABS light on the dash has been coming on every couple of days, of course on the next restart it's off. Could these two issues be related?
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