need brake help....
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Senior User
Joined: Jun 2007
Posts: 188
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need brake help....
1985 F250 6.9L 4x4 auto C6, supercab 129,000miles (I think) and brakes work okay but I cannot lock up the tires no matter how hard I push on the pedal. I replaced the master cylinder and bled the lines and it did not change much. I realized that if I pump the brakes rapidly and then try to stop I have almost no braking power. The rotors and pads look fine so I am thinking it is the brake assist (booster) whatever. I checked the vaccum and it is right on spec. Any advice?
Senior User
Joined: Mar 2006
Posts: 162
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From: sisters or.
it could be the brake booster. if there is a leak in the diafram the vacume leaks out,the brake booster might help some. but i did everything i could to my brakes on my old 1986 6.9. and the brakes were still not to hot. i think it was and is a weak link in the older trucks.the master cylinder is too small or something. some guys have upgrated to a one ton brake system, i think.maybe getting the parts from the junk yard for a reasonable price.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
I realized that if I pump the brakes rapidly and then try to stop I have almost no braking power
For the 2 part vacuum test........visit:
http://photos.FTEs diesel forums.com/memb...8329&protype=1
Kinda gotta look for the 2 parts....... page is all screwed up due to change still.
Last edited by PLC7.3; Feb 17, 2008 at 04:41 AM.
Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
Originally Posted by PLC7.3
To adjust the rears......... just back up and apply the brakes firmly. Drive forward and stop.....do that about 5-10 times and you should feel the difference in the pedal and braking effect
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Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
Originally Posted by PLC7.3
To adjust the rears......... just back up and apply the brakes firmly. Drive forward and stop.....do that about 5-10 times and you should feel the difference in the pedal and braking effect.
Jason
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
I will say after a night of plowing snow, I do have excellent brakes.
All the backing and stopping in 7 or 8 hours of plowing have the brakes tight.
If you want real brakes, and don't mind spending some money, the hydraboost system for a 1997 Super Duty will bolt up.
Locking up the brakes will be easy after that.
All the backing and stopping in 7 or 8 hours of plowing have the brakes tight.
If you want real brakes, and don't mind spending some money, the hydraboost system for a 1997 Super Duty will bolt up.
Locking up the brakes will be easy after that.
Senior User
Joined: Dec 2007
Posts: 108
Likes: 2
From: Colorado Springs, CO
In case you want hydro brakes, here's a link to a tech article detailing the conversion.
http://oilburners.net/forums/showthread.php?t=8777
good luck
http://oilburners.net/forums/showthread.php?t=8777
good luck