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1987 Dodge Dakota height sensing proportiong valve

Tiny
ALXX72
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  • 1987 DODGE DAKOTA
Brakes problem
1987 Dodge Dakota 6 cyl Two Wheel Drive Manual 187k miles

I bought this truck (87 dodge dakota 2x4 for $300, pretty good condition, considering the year and climate. However, the brake system did not fare as well as the rest of the truck. In particular the HSPV. It is badly rusted and 2 brake lines have snapped off in the valve, so I either get a new one at $289, replace the lines and prorobly the wheel cylnders and calipers( those bleeder screws look bad too)
By this time I'm looking at close to 2x if not more than I paid for the truck.
I came up with the idea of bypassing the HSPV. I would connect the primary line directly to the metering valve on the rear axle, and simply plug the bypass line at the differential/metering valve up front. After which I would adjust the rear brakes so as to try and prevent them from locking up as much as possible. I know this is not recommended, but my question is. Would this work?
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Tuesday, April 29th, 2008 AT 3:21 PM

38 Replies

Tiny
MERLIN2021
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It might. But why don't you just cut the line off as close to the end, and use a socket to remove the flare nut portion?
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Tuesday, April 29th, 2008 AT 3:25 PM
Tiny
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The line broke off flush with the valve
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Tuesday, April 29th, 2008 AT 3:40 PM
Tiny
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Basically I wanna know that as long as I plug the bypass line up front I will get pressure to the rears?
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Tuesday, April 29th, 2008 AT 3:42 PM
Tiny
MERLIN2021
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What you would have to do is get a new brake hose long enough to mount it on the rear axle to eliminate the valve, Then branch off to the wheels. If you block it near the Master you wont get fluid at the rear. If the line broke at the valve, the nut is still there.I would do the above proceedure?
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Tuesday, April 29th, 2008 AT 3:48 PM
Tiny
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I think you are missing a part here. I have a preportiong/metering valve up front, 2 lines, a primary and a bypass line go down and just before the rear wheel there is a "height sensing proportioning valve" the 2 lines go into it, but have rusted away and broke off into it. Then 1 line goes to the metering valve on the rear axle. The valve on the axle (tee) is ok. The height sensing proportioning valve is what I am looking to bypass. I hope that helped
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Tuesday, April 29th, 2008 AT 3:58 PM
Tiny
DUSTYR26
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I just had the same thing kind of happen to my HSPV. Mine, all the lines are good, I just replaced them last fall. Now I noticed another leak on the back side of the HSPV. It's not leaking from the bleeders nor where the lines are coming in. Looks like there is a hole on the back side. Someone told me that the hole might be there for when the valve goes bad it will leak out of the hole? I too looked into replacing the HSPV. Same prices too! I believe I am going to bypass the HSPV and run direct to the splitter on the rear axle. My question is which one is the back line and which is the return line. The front spllit has one line directly straight back to the HSPV and one comes out of the bottom of the Front Proportioning valve and goes to the back HSPV. Anyone know which line to leave and which line to Plug? I'm thinking the bottom one is the return line.
Thanks in advance, Dustyr26!
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Friday, May 2nd, 2008 AT 10:04 AM
Tiny
MERLIN2021
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The line out of the combination valve is the one to keep, block the other one.
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Friday, May 2nd, 2008 AT 1:22 PM
Tiny
DUSTYR26
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Thanks,
The combination valve has the two lines coming back to the HSPV. I guess I'm just confused on which of the two to plug at the combination valve. I am assuming it should be the one coming straight back off the end of the combination valve. The other line which I would plug would be the one on the bottom. I will look a little closer once I get under the truck and try to get at it.

I probably will detach both lines back at the HSPV and then press on the brake to see which line shoots the brake fluid out, then that will be the one to connect to the line heading to the tee that goes to each rear tire. I would assume the other would then be the return line and plug that at the front at the combination valve.

Thanks again for the help. It's reassuring to pretend like I know what the heck I'm doing!

Thanks
Dustyr26
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Friday, May 2nd, 2008 AT 3:18 PM
Tiny
MERLIN2021
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It really would not matter which then, both will do the job! Choose the easiest one.
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Friday, May 2nd, 2008 AT 3:29 PM
Tiny
ALXX72
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Yeah Dusty, that's exactly what I'm doing too. I would've been done already, but the weather here has been rainy. No chance to work on it.
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Friday, May 2nd, 2008 AT 9:41 PM
Tiny
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MINE WORKS! ANY?'S I'LL TRY TO HELP
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Sunday, May 4th, 2008 AT 1:30 PM
Tiny
DUSTYR26
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Did you end up plugging the line straight back or the line that comes out of the bottom.

Good to hear yours works!

Thanks in advance.

Dustyr26
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Monday, May 5th, 2008 AT 8:57 AM
Tiny
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I plugged the 1 coming out the back (larger fitting) and ran a line coming out of the bottom all the way back to the tee on the rear axle
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Tuesday, May 6th, 2008 AT 7:50 PM
Tiny
DUSTYR26
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Thanks, I really appreciate the info. My mind set was to do it the other way. No real reason for my madness, but your info will save me from doing it the wrong way. Thanks a million again.

Dustyr26
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Wednesday, May 7th, 2008 AT 8:12 AM
Tiny
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No problem
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Wednesday, May 7th, 2008 AT 12:33 PM
Tiny
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Also, if in the process of bleeding your brake sys. You happen to snap off a bleeder screw, just replace the wheel cylinder(s), shoes and springs. It's well worth it while you're there. Also if they are rusty dont bother trying to loosen them before you heat them up! Really!
Good luck
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Wednesday, May 7th, 2008 AT 12:41 PM
Tiny
DUSTYR26
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Thanks again, Actually I changed all the brake lines and got the bleeders loose last year. Only have 70,000 miles on my rust bucket. All the brakes look really good otherwise. This latest deal with the proportioning valve is the main problem now. Brakes worked fine for this last 8 months. Good to be able to bypass that piece though. Good to know I'm not the only one with this stupid problem!
When I get to doing this I'll let you know how it turns out. Probably won't be for a week or two.
Thanks again,
Dustyr26
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Wednesday, May 7th, 2008 AT 1:43 PM
Tiny
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Ok, kool, let me know.
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Monday, May 12th, 2008 AT 4:27 PM
Tiny
DUSTYR26
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Had time this weekend to work on those brakes.
I tied directly into the back tee and plugged that line coming back out of the front splitter. Bled the lines and everything is working good.

Funny the plug piece only cost me $1.49.
Priceless.

Thanks to everyone with the help on this.

Have a good One!

Dustyr26
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Tuesday, May 13th, 2008 AT 9:09 AM
Tiny
MERLIN2021
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Very good!
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Tuesday, May 13th, 2008 AT 3:50 PM

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