Brakes Apply themselves
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New User
Joined: Nov 2011
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Brakes Apply themselves
Okay,
I have changed almost everything. Pads, Rotors, Calipers, Pins and the Speed sensor. The rear brakes will be applied to the point of making the truck shudder, then the will let go and everything is fine until you aplly the brake pedal then the pressure build to just the back brakes and in a few miless they will release again. I have pulled the fuse to the ABS system doesn't change things. The brake pedal is like a rock when this happens and then goes back to normal when it magically releases itself. Is this the Hydroboost or the ABS system sensor?
1999 7.3 4wd
Help
Upnorth
I have changed almost everything. Pads, Rotors, Calipers, Pins and the Speed sensor. The rear brakes will be applied to the point of making the truck shudder, then the will let go and everything is fine until you aplly the brake pedal then the pressure build to just the back brakes and in a few miless they will release again. I have pulled the fuse to the ABS system doesn't change things. The brake pedal is like a rock when this happens and then goes back to normal when it magically releases itself. Is this the Hydroboost or the ABS system sensor?
1999 7.3 4wd
Help
Upnorth
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
Okay,
I have changed almost everything. Pads, Rotors, Calipers, Pins and the Speed sensor. The rear brakes will be applied to the point of making the truck shudder, then the will let go and everything is fine until you aplly the brake pedal then the pressure build to just the back brakes and in a few miless they will release again. I have pulled the fuse to the ABS system doesn't change things. The brake pedal is like a rock when this happens and then goes back to normal when it magically releases itself. Is this the Hydroboost or the ABS system sensor?
1999 7.3 4wd
Help
Upnorth
I have changed almost everything. Pads, Rotors, Calipers, Pins and the Speed sensor. The rear brakes will be applied to the point of making the truck shudder, then the will let go and everything is fine until you aplly the brake pedal then the pressure build to just the back brakes and in a few miless they will release again. I have pulled the fuse to the ABS system doesn't change things. The brake pedal is like a rock when this happens and then goes back to normal when it magically releases itself. Is this the Hydroboost or the ABS system sensor?
1999 7.3 4wd
Help
Upnorth
Cargo Master
Joined: Feb 2010
Posts: 2,298
Likes: 94
From: Delta, CO
I'd take a good look at the rubber brake lines also, may be hard to tell if it's one of the rubber hoses ate up on the inside. You might have some apply the brakes & watch the hoses to see if one swells.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
I believe there is an adjustment on the rod that connects the pedal and the hydroboost piston. Maybe it needs more "dead zone".
They CAN be adjusted too tight. I have never been in there, but I would think that there may be a jam jut or nuts of some kind to prevent the threads from turning by themselves, and maybe they came loose, allowing the adjuster to get out-of-adjustment.
Just my musings. Like I said, I haven't ever had the need to get in there.
Anyone?
Pop
They CAN be adjusted too tight. I have never been in there, but I would think that there may be a jam jut or nuts of some kind to prevent the threads from turning by themselves, and maybe they came loose, allowing the adjuster to get out-of-adjustment.
Just my musings. Like I said, I haven't ever had the need to get in there.
Anyone?
Pop
4000 rounds a min
Joined: Apr 2010
Posts: 2,223
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From: Albemarle NC
I'm with cj on this one.
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New User
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Okay,
I changed all of the hoses. The effect was worse. Changed out the Hydro-Booster. Brakes are FINALLY fixed!.
4 New calipers Warranty
4 Sets of Pins $50
4 New Rotors Warranty
Pads All the way around. Warranty
All Hoses - New $85
Hyrdo-Booster $160
1 qt fluid $8
new Brakes that finally work...Priceless
UpNorth61
Thanks for the help!
I changed all of the hoses. The effect was worse. Changed out the Hydro-Booster. Brakes are FINALLY fixed!.
4 New calipers Warranty
4 Sets of Pins $50
4 New Rotors Warranty
Pads All the way around. Warranty
All Hoses - New $85
Hyrdo-Booster $160
1 qt fluid $8
new Brakes that finally work...Priceless
UpNorth61
Thanks for the help!
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Thanks for closing the loop on this one. An unusual situation that we virtually never see, thank goodness!
Your experience may very-well help the next guy with similar symptoms.
That's how this whole forum thing is supposed to work for all of us.
Pop
Your experience may very-well help the next guy with similar symptoms.
That's how this whole forum thing is supposed to work for all of us.
Pop
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