low/soft brake pedal
Thread Starter
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Posting Guru
Joined: Mar 2010
Posts: 2,234
Likes: 2
From: Upstate NY
low/soft brake pedal
Hello, my brake pedal is spongy and very low, has no firmness at all, theres no air in the lines I've bled for ****s, has new pads and rotors aswell, slide pins greased
I put on a new powersteering pump and flushed the PS system
could this be a failing master?
or failing hydroboost?
help appreciated thanks fte
I put on a new powersteering pump and flushed the PS system
could this be a failing master?
or failing hydroboost?
help appreciated thanks fte
More Turbo
Joined: Nov 2011
Posts: 740
Likes: 92
sounds like a failing master. push the pedal as far as you can to the floor and hold. See if it slowly sinks to the floor while you are putting constant pressure on it. Don't push as hard as you can, just regular brake pedal pressure. It will feel like it is slowly sinking from under your foot. At least one test for a master.
Thread Starter
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Posting Guru
Joined: Mar 2010
Posts: 2,234
Likes: 2
From: Upstate NY
Could it really be though, I still have decent stopping power? I think im going to get me self bleeding tool out, put on a new master, and maybe flush 2 quarts out of the hydro system today, just gotta go pick up some ar 15 goodies first haha, stay tuned ill let you guys know how it turns out
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New User
Joined: Oct 2004
Posts: 8
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What happened? Did you fix your issue? I have a similar issue.
My test of the hydroboost passed. With engine off,, pump brake pedal 4 times until hard, hold with light pressure. Start Engine, pedal will sink and then return.
Trying to figure out if it is the master.
My test of the hydroboost passed. With engine off,, pump brake pedal 4 times until hard, hold with light pressure. Start Engine, pedal will sink and then return.
Trying to figure out if it is the master.
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New User
Joined: Oct 2004
Posts: 8
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Replaced the master cylinder. Same soft pedal. I can engage ABS with the pedal as it is, but it sure feels poor.
Toll so far, rotors, rebuilt calipers, pads, master cylinder. Lots of bleeding, running, not running, hand vacuum pump, old fashion pedal pumps, No change. At least I got rid of the lot rot on the rotors.
Only theories left. Bleed system again with ABS system enabled via computer. new stainless brake lines, Adjust push rod, (https://www.ford-trucks.com/forums/7...rake-feel.html) Replace hydroboost unit?, Power steering pump?
Toll so far, rotors, rebuilt calipers, pads, master cylinder. Lots of bleeding, running, not running, hand vacuum pump, old fashion pedal pumps, No change. At least I got rid of the lot rot on the rotors.
Only theories left. Bleed system again with ABS system enabled via computer. new stainless brake lines, Adjust push rod, (https://www.ford-trucks.com/forums/7...rake-feel.html) Replace hydroboost unit?, Power steering pump?
Laughing Gas
Joined: Jan 2005
Posts: 1,142
Likes: 25
I had the same problem on an 03 F-350 dually after blowing a rear caliper apart. Bleed system several times and never could get a decent pedal, a really problem when pulling a 15000# 5'er with a boat behind it. Found out that if you get air up into the ABS you cannot bleed it out without a scan tool that is capable of opening the ABS solenoids. I had my dealer bleed them for $75.00 and what a difference it made.
Thread Starter
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Posting Guru
Joined: Mar 2010
Posts: 2,234
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From: Upstate NY
my power steering was affected also yes
new pump cleared up my brake and steering problems, truck only had about 100k miles.
However install a filter and flush the system if you replace the pump, mine had trash in the system and ruined the new pump and I got to replace the pump a second time
new pump cleared up my brake and steering problems, truck only had about 100k miles.
However install a filter and flush the system if you replace the pump, mine had trash in the system and ruined the new pump and I got to replace the pump a second time
