Ahhhhhh been missing that clatter
Logistics Pro
Joined: Sep 2007
Posts: 3,737
Likes: 179
From: Western Mass
Fluid is topped up, and no leaks, already checked.
The booster has always been bad on this, but this year it's simple dangerous. Last year it would make the whoosh sound, but didn't go all the way down to the floor.
The whoosh sound pretty much gives it away that it's the booster. I will replace the MC as well though.
The booster has always been bad on this, but this year it's simple dangerous. Last year it would make the whoosh sound, but didn't go all the way down to the floor.
The whoosh sound pretty much gives it away that it's the booster. I will replace the MC as well though.
Did you pull the rear wheels to look for a leak? Just seems to me if the pedal goes to the floor, either there is air in the system, or a leak somewhere.
Can you pump the brakes up and get a pedal?
The role of the booster is just that, to boost the force on the pedal. Internally there is a rod that will just pass your foot pressure onto the master cylinder if the boost stops boosting. After the truck has been off for a bit, hit the brakes a couple times to drain all the vacuum. Whats the pedal feel like then?
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
If I just hit the brakes, it does this big WHOOOSH sound, and pedal goes the floor, and the brake light comes on. I have to give it a couple pumps, then it brakes normal.
Fluid isn't going down, and I can clearly hear the whoosh coming from the firewall.
Once the pedal is pumped up and braking normally, it doesn't loose pressure. It stays right up no matter how hard I step on it.
Fluid isn't going down, and I can clearly hear the whoosh coming from the firewall.
Once the pedal is pumped up and braking normally, it doesn't loose pressure. It stays right up no matter how hard I step on it.
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
The front brakes are all new from last year, bled and everything. Never touched the rears though, never even looked at them cause I have to pull the axle out to get the drum off.
It's always had a rather soft pedal, that would go down abit lower than it should, but this year, it simply goes to the floor and doesn't really apply the brakes unless I pump it.
It's been on the road for 2 days now, and already got 300+ miles done, and brake fluid hasn't moved, so I really don't know how air can be getting in or anything leaking out all of a sudden like that.
Guess I'll hold off on the booster for now, and just replace the master, see what that does, if it fixes it, then good for me, if not, keep looking. lol
It's always had a rather soft pedal, that would go down abit lower than it should, but this year, it simply goes to the floor and doesn't really apply the brakes unless I pump it.
It's been on the road for 2 days now, and already got 300+ miles done, and brake fluid hasn't moved, so I really don't know how air can be getting in or anything leaking out all of a sudden like that.
Guess I'll hold off on the booster for now, and just replace the master, see what that does, if it fixes it, then good for me, if not, keep looking. lol
Logistics Pro
Joined: Sep 2007
Posts: 3,737
Likes: 179
From: Western Mass
If some air got into the rear lines somewhere, it will take a few pumps to compress it enough for the brakes to apply. Once compressed and enough brake fluid is stuffed into the lines, it will work for a while and semi hold the pedal. Once stopped, the air will slowly expand and push the fluid back up towards the master causing the pedal to drop next time the truck is run.
It could be a problem with it leaking past the master as well, though I'm not sure that would hold when pumped up.
I would try bleeding the rears first, it might just need some new fluid, I think old stuff can get spongy when it absorbs water. If that doesn't help, swap out the master (make sure you bench bleed it first).
It could be a problem with it leaking past the master as well, though I'm not sure that would hold when pumped up.
I would try bleeding the rears first, it might just need some new fluid, I think old stuff can get spongy when it absorbs water. If that doesn't help, swap out the master (make sure you bench bleed it first).
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
On the vacuum brake boosters if you are hearing a whoosh sound then the booster is toast.
If it's going all the way to the floor with no visible leaks then the master could be toast too. The piston in the master could be shot. Easy to check. unbolt the master from the booster, pull master out some if you see any dampness in the booster then replace both.
If it's dry, just swap out the booster first and then see how it acts. If you no longer have the whoosh but still have the pedal issue then do the master cylinder. No need spending any more money then necessary.
If it's going all the way to the floor with no visible leaks then the master could be toast too. The piston in the master could be shot. Easy to check. unbolt the master from the booster, pull master out some if you see any dampness in the booster then replace both.
If it's dry, just swap out the booster first and then see how it acts. If you no longer have the whoosh but still have the pedal issue then do the master cylinder. No need spending any more money then necessary.
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
John, you got any room in that van for some, "33's"? LMAO Do you know what I am referencing? I bet there are probably more on here that do know than I realize.....but just curious. Course those, "gramos" might skip a lil bit since you ain't stopping so well. LMAO
Elder User
Joined: Sep 2006
Posts: 837
Likes: 0
From: Tulsa, OK
No dirty minds here! I just washed mine last Weekend!
33's and gramos......I noticed the Hi Tech HIFI system you were drooling over for your van. I just figured you would appreciate some tunes from the 20's in that mobile stabbin wagggin of yours John. 33's, 45's and 78's are all LPs bubba!
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Don't forget the old 78's!!!! 
Maybe I should put this old '60's fireplace/stereo I got not long ago in my van, coolest thing ever
Everything works including the 8 track!
25$ for that baby! Fixed the broken door archers and she was good to go.
Maybe I should put this old '60's fireplace/stereo I got not long ago in my van, coolest thing ever
Everything works including the 8 track!
25$ for that baby! Fixed the broken door archers and she was good to go.
Elder User
Joined: Sep 2006
Posts: 837
Likes: 0
From: Tulsa, OK
OMG!!! God help the women, children and sheep....LMAO I bet you got the whole late 60's, early 70's pimp suit too! ROFL I already know you have rug burn on your knees and elbows from that **** carpet too....... That fireplace is so ghetto John. I love it!
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