F150 Brake Problem - Mustang Evolution

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Old 06-22-2012, 08:07 PM   #1
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F150 Brake Problem

Well guys maybe y'all can help. I have a 98 f150 5.4 4x4. The truck has a very soft brake pedal but it stops well. However after I stop at a red light the brake pedal goes soft after about 5 seconds and the truck starts to roll. I have found no fluid leaks. What do y'all think I should do?
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Old 06-23-2012, 04:49 PM   #2
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Bad rotors or pads maybe
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Old 06-23-2012, 08:30 PM   #3
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I'd say either a bad master cylinder or power booster.
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Old 06-23-2012, 09:07 PM   #4
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Quote:
Originally Posted by 1998
Bad rotors or pads maybe
Don't think so.

---------- Post added at 08:07 PM ---------- Previous post was at 08:06 PM ----------

Quote:
Originally Posted by aegischief
I'd say either a bad master cylinder or power booster.
I agree is there a way to determine the problem between the two?
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Old 06-23-2012, 10:00 PM   #5
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I'm not sure. I've never had to change either one. I am thinking its probably the power booster. See of your get improved pedal pressure by revving your motor a little. Since you don't have fluid loses it has to be a loss of vacuum somewhere.
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Old 06-23-2012, 10:08 PM   #6
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My big bro came to me with the exact same problem in his 98' F-150 4x4. His turned out to be the brake booster after we replaced freekin everything 1 by 1 lol. Good luck with it!
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Old 06-23-2012, 10:24 PM   #7
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It's the brake booster bro. I've had this problem with my dads '01 F150. If you can spare the extra $ go ahead and replace the master cylinder and flush out your brake fluid too. My dads master cylinder ran him about $45 and I think the booster was $80. Do it and it'll stop on a dime and give you 6 cents change. Lol, ok, that was lame. Haha.
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Old 06-23-2012, 10:29 PM   #8
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You have no fluid loss ?
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Old 06-23-2012, 10:29 PM   #9
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Btw, if you're on an iPhone there's an app called F150 forum. I'm on there too, under PrimerEcho. A bunch of good people there too if ya wanna check it out.
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Old 06-23-2012, 10:30 PM   #10
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Quote:
Originally Posted by primer2tone
Btw, if you're on an iPhone there's an app called F150 forum. I'm on there too, under PrimerEcho. A bunch of good people there too if ya wanna check it out.
So am I garbill2003 lol
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Old 06-23-2012, 10:35 PM   #11
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Hahaha, it makes sense. A lot of us ford guys need a truck. Why not an F150?
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Old 06-23-2012, 10:39 PM   #12
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Quote:
Originally Posted by primer2tone
Hahaha, it makes sense. A lot of us ford guys need a truck. Why not an F150?
Yep ford all the way heres the rig

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Old 06-23-2012, 10:42 PM   #13
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Quote:
Originally Posted by garbill2003

Yep ford all the way heres the rig
Nice truck
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Old 06-23-2012, 10:48 PM   #14
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Quote:
Originally Posted by aegischief
I'm not sure. I've never had to change either one. I am thinking its probably the power booster. See of your get improved pedal pressure by revving your motor a little. Since you don't have fluid loses it has to be a loss of vacuum somewhere.
Ok will do.
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Old 06-23-2012, 10:48 PM   #15
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Quote:
Originally Posted by 1998

Nice truck
Thanks bud and no its not supercharged it. just a sticker lmao
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Old 06-23-2012, 10:49 PM   #16
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Quote:
Originally Posted by primer2tone
It's the brake booster bro. I've had this problem with my dads '01 F150. If you can spare the extra $ go ahead and replace the master cylinder and flush out your brake fluid too. My dads master cylinder ran him about $45 and I think the booster was $80. Do it and it'll stop on a dime and give you 6 cents change. Lol, ok, that was lame. Haha.
Hahaha alright I bought a new master cylinder I was hoping that was all it needed.

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You have no fluid loss ?
None
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Old 06-23-2012, 10:51 PM   #17
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Quote:
Originally Posted by 03GT88

Ok will do.
Sorry not trying to take over your thread. Theirs no fluid loss then correct?

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Quote:
Originally Posted by 03GT88

Hahaha alright I bought a new master cylinder I was hoping that was all it needed.

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None
I would look into what's cheeper first then
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Old 06-23-2012, 10:51 PM   #18
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Quote:
Originally Posted by garbill2003

Thanks bud and no its not supercharged it. just a sticker lmao
Haha. I never saw the sticker till you mentioned it. But supercharging it might not be a bad idea...
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Old 06-23-2012, 10:52 PM   #19
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Quote:
Originally Posted by garbill2003

Sorry not trying to take over your thread. Theirs no fluid loss then correct?

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I would look into what's cheeper first then
Somtimes its just trial and error with things yah know
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Old 06-23-2012, 10:54 PM   #20
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No fluid loss. I forgot to mention The last time I drove it and it lost pressure I slammed the pedal twice and heard a weird sound coming from the engine bay??
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Old 06-23-2012, 10:56 PM   #21
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Here is the brakeless beast!

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Old 06-23-2012, 10:58 PM   #22
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Quote:
Originally Posted by 03GT88
Here is the brakeless beast!
Haha that's funny. But I see how that could get pretty hairy when you start braking and your foot goes straight to the floor with no braking effect. But that is a nice truck
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Old 06-23-2012, 11:06 PM   #23
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Quote:
Originally Posted by 03GT88
No fluid loss. I forgot to mention The last time I drove it and it lost pressure I slammed the pedal twice and heard a weird sound coming from the engine bay??
Check the hose going into the booster itself make sure its ok

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Here is the brakeless beast!
I want the flare side for mine
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Old 06-23-2012, 11:08 PM   #24
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I checked it its fine. Someone told me normally when they go out it'll blow that hose off?
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Old 06-23-2012, 11:10 PM   #25
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Quote:
Originally Posted by 03GT88
I checked it its fine. Someone told me normally when they go out it'll blow that hose off?
Then I would look into the master cylinder
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Old 06-23-2012, 11:15 PM   #26
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Alright ill be checking it all out tomorrow. Thanks for the input everyone.
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Old 06-23-2012, 11:16 PM   #27
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Good luck with it!
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Old 06-24-2012, 07:37 AM   #28
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Agree with all the great advice. If the vacuum lines are are in place like they should be, I would change the booster and master cylinder together. You gotta take it off anyway so you might as well do it if got the $$$ for the part.
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Old 06-24-2012, 10:59 PM   #29
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Replaced the brake master cylinder today and wow the difference is night and day. The truck is stopping on a dime and the pedal is not going soft.
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Old 06-25-2012, 12:08 AM   #30
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Glad to hear. :Good:
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Old 06-25-2012, 09:36 AM   #31
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Quote:
Originally Posted by 03GT88
Replaced the brake master cylinder today and wow the difference is night and day. The truck is stopping on a dime and the pedal is not going soft.
Good deal
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Old 06-25-2012, 12:25 PM   #32
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Quote:
Originally Posted by primer2tone
Hahaha, it makes sense. A lot of us ford guys need a truck. Why not an F150?
Why not. One day, I shall own one.
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Old 06-25-2012, 01:23 PM   #33
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Quote:
Originally Posted by 03GT88
Replaced the brake master cylinder today and wow the difference is night and day. The truck is stopping on a dime and the pedal is not going soft.
That's awesome.
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Old 06-25-2012, 02:31 PM   #34
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Not to hijack this thread, but while on the topic of brakes, what do you suppose would be causing the opposite problem?
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Old 06-25-2012, 02:44 PM   #35
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Quote:
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Not to hijack this thread, but while on the topic of brakes, what do you suppose would be causing the opposite problem?
Could be the same thing but I would check fluid loss or a bad caliper would be more likely
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