99 F150 Brake Problem
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New User
Joined: Jun 2013
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From: Sherman, Texas
99 F150 Brake Problem
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".
Any ideas? I'm stumped.
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".
Any ideas? I'm stumped.
Senior User
Joined: Jan 2012
Posts: 145
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It takes special equipment to bleed the ABS. That Is probably why the ABS light is on. If your truck has rear brake shoes they made need adjusting. I've gone over this before with others. Rethink how ABS works, without the engine running you will have a high brake with the vacuum bled off. When it's running and your sitting still the sensors pick up the wheels aren't turning and the ABS will bypass fluid and you will have a low soft pedal. It is the nature of the beast.
New User
Joined: Jan 2012
Posts: 23
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From: Portland, Oregon
What if you have the same problem but the ABS light is not on? No lights are on, in fact.
So when you're driving and hit the brakes, it is firm for a second or two then goes mushy to the floor? The truck still stops, but it sure gives me an uneasy feeling.
So when you're driving and hit the brakes, it is firm for a second or two then goes mushy to the floor? The truck still stops, but it sure gives me an uneasy feeling.
Fleet Mechanic
Joined: Nov 2000
Posts: 1,713
Likes: 2
From: In my House
..Furd...Your abs module is bad then$$$$...Do a search of "sinking brake pedal" on ford trucks... I have been having the same issue for almost a year now.....I just havent bought a new abs module yet.
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