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Old May 22, 2003 | 06:08 PM
  #1  
workin hard's Avatar
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brake problems

I just put new front brakes including calipers on my 79 f-250 4x4 ,I have no idea what shape the rears are in but if I make a hard stop the rears will lock up. It seems that the fronts are working just not as much as they should. I was very carefull to blead the fronts after they were installed. Any body Any thoughts
 
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Old May 22, 2003 | 10:36 PM
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brake problems

Check your proportioning valve.
 
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Old May 22, 2003 | 11:07 PM
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brake problems

you need to check the rears the brakes on a truck are a system .
The axle seals could be leaking in the rear causing it to lock up .
Check out the rear and post what you find . See if they are over adjusted - the springs in the back get old and fatigued and should be replaced along with the wheel cylinders
 
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Old May 23, 2003 | 05:47 AM
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brake problems

I'll check the rears out this weekend. How do I know if the proportioning valve is working or not?
 
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Old May 23, 2003 | 02:06 PM
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Chas1234
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brake problems

Do you have a brake warning light on?
Check the buld to make sure it isnt blown.
Do you have a haynes manual?- you should get one and read it ,it will explain a lot !
 
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Old May 26, 2003 | 10:39 AM
  #6  
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brake problems

Well I pulled the rear drums and they are as dry as a bone. (very slight galze) Allthough they look like theres still a little life left I will go ahead and replace them including wheel cyl. and hardware.
 
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Old May 27, 2003 | 06:11 AM
  #7  
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workin hard
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brake problems

After digging into this more I have discovered that the proportioning valve is shot. Please read my new post- Proportioning valves.
 
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