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Started By
Message
No brake pressure - Any help?
Posted on 7/30/14 at 12:22 pm
Posted on 7/30/14 at 12:22 pm
I had been noticing the past 2 days I was having to press harder on the brakes to get my truck to stop. Well driving home from work yesterday it got to the point where I had to press all the way to the floor to get it to stop. Has anyone else experienced this?
Once I got home I took the tires off, checked for leaks near the calipers and along the lines - no leaks, then bled the lines in each tire. Front left had some air but it then released brake fluid. All other tires had good release except the back right where it just dribbled out.
Later that day I came back to it and had a friend pump the breaks and I watched the reservoir and master cylinder. When he pumped the breaks, I noticed the reservoir bubbled a bit. I did a bit of research and found that if there are no leaks and tire pressure is still low after bleeding, I most likely have a bad master cylinder. The bubbling could be from there being an internal leak in the cylinder and it sending it back to the reservoir.
Anyone else have an experience like this and have some advice to offer?
F150 2008 King Ranch 4x4
Once I got home I took the tires off, checked for leaks near the calipers and along the lines - no leaks, then bled the lines in each tire. Front left had some air but it then released brake fluid. All other tires had good release except the back right where it just dribbled out.
Later that day I came back to it and had a friend pump the breaks and I watched the reservoir and master cylinder. When he pumped the breaks, I noticed the reservoir bubbled a bit. I did a bit of research and found that if there are no leaks and tire pressure is still low after bleeding, I most likely have a bad master cylinder. The bubbling could be from there being an internal leak in the cylinder and it sending it back to the reservoir.
Anyone else have an experience like this and have some advice to offer?
F150 2008 King Ranch 4x4
3
Posted on 7/30/14 at 12:28 pm to tsmi136
Sounds like master cylinder.
Posted on 7/30/14 at 12:30 pm to tsmi136
Well at least you made it home and were not found on road dead.
I agree it sounds like a bad MC.
I agree it sounds like a bad MC.
Posted on 7/30/14 at 12:33 pm to Bleeding purple
And I had a cop tailgating me the entire time 
Pissed me off so much
Pissed me off so much
Posted on 7/30/14 at 12:47 pm to Bleeding purple
quote:ISWYDT
found on road dead
Posted on 7/30/14 at 12:52 pm to TexasTiger01
quote:no
Sounds like master cylinder.
Posted on 7/30/14 at 12:54 pm to tsmi136
quote:
No brake pressure
quote:
I had been noticing the past 2 days I was having to press harder on the brakes to get my truck to stop
sounds like you have plenty of pressure,just no power assist which comes from
which has probably gone bad because the rear of your master cylinder has a small leak that has destroyed the rubber diaphragm inside of the brake booster.
You'll need to change both.
Posted on 7/30/14 at 12:54 pm to meauxjeaux2
quote:
no
Must be low on blinker fluid heh....
Posted on 7/30/14 at 12:57 pm to TexasTiger01
why the rollie eyes? A master cylinder going bad never makes you have to stand on the brakes to come to a stop.
It's always the power brake booster.Now as i said,it could be bad because of a leaking rear seal on the master cylinder.
It's always the power brake booster.Now as i said,it could be bad because of a leaking rear seal on the master cylinder.
Posted on 7/30/14 at 12:58 pm to meauxjeaux2
quote:
which has probably gone bad because the rear of your master cylinder has a small leak that has destroyed the rubber diaphragm inside of the brake booster. You'll need to change both.
If this was an older model GM vehicle, I would agree.... The booster and master cylinder operate seperatly. Let's not forget, he had air in the lines....
This post was edited on 7/30/14 at 1:01 pm
Posted on 7/30/14 at 1:01 pm to TexasTiger01
08 f150
Posted on 7/30/14 at 1:05 pm to meauxjeaux2
quote:
If this was an older model GM vehicle, I would agree
quote:
08 f150
I agree with you in theory, it just doesn't sound like both are bad. A quick way to test this is remove the vacuum line from the booster, straighten out a coat hanger and crimp a small piece of paper towel on one end. Use this as a swab inside of the booster to see if there is any fluid or residue in the booster.
Posted on 7/30/14 at 1:12 pm to TexasTiger01
Could also be the one way vacuum valve on the booster releasing vacuum.
Posted on 7/30/14 at 1:33 pm to meauxjeaux2
Every time I've ever had a booster go out, the pedal gets very hard to push, and it jumps up high. You can't push it anywhere near the floor.
Bubbles and soggy pedal sound like master cylinder to me.
Bubbles and soggy pedal sound like master cylinder to me.
Posted on 7/30/14 at 1:38 pm to Teague
quote:and OP said this in his topic did he not?
Every time I've ever had a booster go out, the pedal gets very hard to push
quote:air in the system from a leaking seal would allow the pedal to go all the way to the floor if pushed hard enough.
Bubbles and soggy pedal sound like master cylinder to me.
When a master cylinder fails it fails internally causing fluid bypass. This results in less than spectacular braking performance and sometimes leaks.
When a power booster fails the pedal becomes rock hard.
When a master cylinder leaks a little from the back into the power booster you get what the OP described.
Hard to press pedal but will go to the floor if applied hard enough for a long enough period.
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