1983 110 Proportioning Brake Valve - Defender Source
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  #1  
Old November 7th, 2014, 11:14 AM
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Robert Davis
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1983 110 Proportioning Brake Valve

I have replaced the rear cylinders and shoes on our 1983 110.
The air is bleed out.
The brakes will pump up and the petal rise, but gets softer and the warning light comes on after it sits.
Suspect the master cylinder has collapsed internally, but am also suspicious of the proportioning valve.

Has anyone had issues with, rebuilt, or replaced an early 110 proportioning valve.
The 110 proportioning valve looks very much like a Series III one, but I am not sure they are the same as I was not able to cross the part numbers using my books.

Any technical input is welcome.
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  #2  
Old November 7th, 2014, 11:25 AM
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Bill Adams
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I deleted it, reconsidered, then put in a Wilwood adjustable one. You can also sub one from a Volvo 240. same damn thing.
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  #3  
Old November 7th, 2014, 11:48 AM
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Mike Simpson
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By proportioning valve are you talking about the PDWA or the one on the frame rail in back?

When I had a very similar issue a while back it ended up with me being a dummy and not realizing that the rear drum brakes were just out of adjustment. You might try clamping off the flex line to the rear brakes and see if the pedal is suddenly nice and firm, and if your warning light still actuates.

The adjusters on those rear drums really suck, to the point I'm plotting a rear disc conversion at some point in the future. Also, and you most likely already know this, but it's really easy to reverse the leading and trailing shoes on those brakes, which will contribute to this as well.
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  #4  
Old November 7th, 2014, 12:59 PM
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Quote:
Originally Posted by meatblanket View Post
By proportioning valve are you talking about the PDWA or the one on the frame rail in back?

When I had a very similar issue a while back it ended up with me being a dummy and not realizing that the rear drum brakes were just out of adjustment. You might try clamping off the flex line to the rear brakes and see if the pedal is suddenly nice and firm, and if your warning light still actuates.

The adjusters on those rear drums really suck, to the point I'm plotting a rear disc conversion at some point in the future. Also, and you most likely already know this, but it's really easy to reverse the leading and trailing shoes on those brakes, which will contribute to this as well.
Thanks for the input, yes the PDWA.
Yes I know what you refer to as far as adjustment and leading and trailing shoes as it's the same as the 109. All is adjusted as well.

Generally use clamping off the lines as well when needed... but was really looking for some experience with the proportioning valve.

Quote:
Originally Posted by o2batsea View Post
I deleted it, reconsidered, then put in a Wilwood adjustable one. You can also sub one from a Volvo 240. same damn thing.
Good to know.
Thanks.
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Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
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  #5  
Old November 7th, 2014, 01:31 PM
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I went with a generic Summit racing unit.
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A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.

I don't know about the brakes, only their unreliability.
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  #6  
Old November 7th, 2014, 03:02 PM
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This might be helpful.
http://siteground237.com/~gunsandr/s...highlight=pdwa
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  #7  
Old November 7th, 2014, 03:23 PM
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Quote:
Originally Posted by meatblanket View Post

Great link
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  #8  
Old November 7th, 2014, 05:30 PM
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PDWA=useless excess safety wierdness.
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  #9  
Old November 7th, 2014, 06:17 PM
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Quote:
Originally Posted by o2batsea View Post
PDWA=useless excess safety wierdness.
Pretty Damn Worthless Apparatus

Pointless Double Weird Attachment

Potential Danger When Activated
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  #10  
Old November 8th, 2014, 07:37 PM
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Robert, If the Valve is faulty why would it decrease the pedal? Wouldn't it just apply more pressure to the front and or rear as the valve bleeds down? I would think if would show more in how the truck stops showing a heavy bias in the front or the rear if it were bad?
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Old November 8th, 2014, 09:28 PM
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When my PDWA went bad, it started leaking at the sensor. ~80% of the fluid from each pedal stroke leaked out! The pressure warning sensor became a major safety hazard when it went bad.
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  #12  
Old November 8th, 2014, 09:44 PM
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Quote:
Originally Posted by grnrvrs View Post
When my PDWA went bad, it started leaking at the sensor. ~80% of the fluid from each pedal stroke leaked out! The pressure warning sensor became a major safety hazard when it went bad.
Was it a simple failure of the unit or a complication after bleeding the system as part of other brake system service?
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  #13  
Old November 8th, 2014, 09:57 PM
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It was an old valve, but failed after a complete rebuild of everything else in the system.
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  #14  
Old November 9th, 2014, 09:33 AM
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Robert Davis
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Quote:
Originally Posted by Capt Milks View Post
Robert, If the Valve is faulty why would it decrease the pedal? Wouldn't it just apply more pressure to the front and or rear as the valve bleeds down? I would think if would show more in how the truck stops showing a heavy bias in the front or the rear if it were bad?
When I worked at the dealership years ago, a Series III came in with a low petal.
The petal was soft with the warning light on.
The Service manager had me replace the master and work down the lines.
Next was the proportioning valve and after replacing it the brakes worked fine.
Turned out the proportioning valve was cocked to one side and wouldn't return to the center position.
That's all I remember about the scenario, but was never sure if the master cylinder and proportioning valve both needed replacing or not.
At the dealer, the theme was "get em in and get em out" ASAP.
Sometimes people would wait for you to fix their ride.
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RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
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