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Load sensing proportioning valve troubleshooting

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Offline Zukikick

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Load sensing proportioning valve troubleshooting
« on: July 15, 2007, 12:17:56 PM »
Hi, how do I find out if this valve is working correctly?  Just changed brake cylinders on a 97 Sidekick 4 door and can't get any fluid out of the left cylinder when I bleed it.

Thanks

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Offline derekj

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Re: Load sensing proportioning valve troubleshooting
« Reply #1 on: July 15, 2007, 08:48:03 PM »
crack the brake line and see if you get any at the output of the valve - if so you probably have a collapsed line of some dirt in it.

derek
91 Sidekick jx
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2" BDS body lift
1" Coil spacers
32" TSL's and some other stuff I did And now with a Lockrite!  www.cardomain.com/memberpage/783382

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Offline mrfuelish

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Re: Load sensing proportioning valve troubleshooting
« Reply #2 on: July 15, 2007, 09:23:46 PM »
On my 94 it goes into my right side wheel cylinder from the valve and then back out of the wheel cylinder to the left side, so if your getting fluid on one side and not the other it should not be that hard to track down with one line going across the rear diff.
1987,1988,1988,1990 samurai's,  1953 m38a1,  1996 x-90,blue.1996 x-90 red.1994 2 door tracker.   only Dead Fish go with the flow.                No Hairy Nosed Wombats were ran over on the trail today.       My ZUK is Xenophobic.

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Offline Zukikick

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Re: Load sensing proportioning valve troubleshooting
« Reply #3 on: July 18, 2007, 10:55:09 AM »
Further troubleshooting indicates that the proportioning valve doesn't seem to be porting fluid to the rear brake side of the valve at all. Any suggestions (besides a new one)? What sort of crossover is there between years/models/badges? Dealer wants around $440 Cdn bucks for a new one.

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Offline beercheck

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Re: Load sensing proportioning valve troubleshooting
« Reply #4 on: July 18, 2007, 11:23:04 AM »
Just to ask, did you install a lift on that truck?  'Cause, if you did but didn't adjust the actuating spring, there's your whole problem right there.  In your troubleshooting, did you unhook the spring?

If you're jacking the back of the truck up by the frame, the axle will be at down-travel, letting the valve cut off the supply.  Also, if I recall correctly, the valve is on the passenger side, so if you jack the truck by placing the jack under the driver side of the axle, again, the valve will be extended, meaning no-juice-for-you.


(edit:  I'm familiar with the 03's setup, not the pre-99 stuff.)
« Last Edit: July 18, 2007, 11:32:03 AM by beercheck »
'03 ZR2 2dr Tracker, '02 XL-7 drivetrain and electrcs
XL-7 front coils
1.5" rear coil spacers
Monroe 32316 shocks w/2" extenders
235/70-16 Bridgestone Destination A/Ts on stock XL-7 Alloys RRO Rock Rails (Presently removed, as they rusted to all hell; all the bolts were rusted to dust.  Real nice, RRO...) http://www.trivia-nights.com

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Offline mrfuelish

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Re: Load sensing proportioning valve troubleshooting
« Reply #5 on: July 18, 2007, 11:32:56 AM »
If you want to just take the guts out of it and put it back together with out them. if its stuck pull the cap off and hit the brakes real hard.  ;D
1987,1988,1988,1990 samurai's,  1953 m38a1,  1996 x-90,blue.1996 x-90 red.1994 2 door tracker.   only Dead Fish go with the flow.                No Hairy Nosed Wombats were ran over on the trail today.       My ZUK is Xenophobic.

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Offline Zukikick

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Re: Load sensing proportioning valve troubleshooting
« Reply #6 on: July 18, 2007, 12:54:57 PM »
No lift, she's stock. We've tried jacking the rear diff. while the  frame is on jackstands, no luck. Lowered it to as much weight-on-wheels as would allow access, still no juice. Checking wreckers, but 97s seem pretty scarce. Don't know what other years might work. One place has a 98, would that work? :-\

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Offline beercheck

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Re: Load sensing proportioning valve troubleshooting
« Reply #7 on: July 18, 2007, 01:13:23 PM »
If it's the same mechanism as on mine, definitely try just unhooking the linkage from the axle comepletely.  Could be something as simple as a spring rusted too much to allow stretching.
'03 ZR2 2dr Tracker, '02 XL-7 drivetrain and electrcs
XL-7 front coils
1.5" rear coil spacers
Monroe 32316 shocks w/2" extenders
235/70-16 Bridgestone Destination A/Ts on stock XL-7 Alloys RRO Rock Rails (Presently removed, as they rusted to all hell; all the bolts were rusted to dust.  Real nice, RRO...) http://www.trivia-nights.com

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Offline HotRod

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Re: Load sensing proportioning valve troubleshooting
« Reply #8 on: July 18, 2007, 06:05:22 PM »
Looks like there is also an Adjustment screw on top.
Here's anice close up pic of it.
and there looks like there is also a bleeder valve on that too.
SOrry so dirty. ;)
« Last Edit: July 18, 2007, 06:16:11 PM by HotRod »
95 2dr Geo Tracker with Calmini 6"inch combo lift, 32'inch BFGs M/Tlocked and loaded--D.D is my 06 Racy RED Aerio SX AWD

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Offline beercheck

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Re: Load sensing proportioning valve troubleshooting
« Reply #9 on: July 18, 2007, 10:32:42 PM »
Wow, they cleaned that design up A LOT in the next generation.

I guarandamntee nothing transfers over.  So much for my spare part(s).
« Last Edit: July 18, 2007, 10:34:34 PM by beercheck »
'03 ZR2 2dr Tracker, '02 XL-7 drivetrain and electrcs
XL-7 front coils
1.5" rear coil spacers
Monroe 32316 shocks w/2" extenders
235/70-16 Bridgestone Destination A/Ts on stock XL-7 Alloys RRO Rock Rails (Presently removed, as they rusted to all hell; all the bolts were rusted to dust.  Real nice, RRO...) http://www.trivia-nights.com

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Offline HotRod

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Re: Load sensing proportioning valve troubleshooting
« Reply #10 on: July 18, 2007, 10:47:23 PM »
Looks like there is also an Adjustment screw on top.
Here's anice close up pic of it.
and there looks like there is also a bleeder valve on that too.
SOrry so dirty. ;)


BTW: this shot is off of my 97 4dr which is saddly sold to a guy that has already
lifted it with the TrailTough SAS kit and Yota axles.
Pics when ever I get a hold of them.
95 2dr Geo Tracker with Calmini 6"inch combo lift, 32'inch BFGs M/Tlocked and loaded--D.D is my 06 Racy RED Aerio SX AWD

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Offline Rhinoman

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Re: Load sensing proportioning valve troubleshooting
« Reply #11 on: July 19, 2007, 05:14:14 AM »
Is the LSPV fitted to all US Track/Kicks? Theres nothing like that on my 2dr UK model.
2000 Vitara 1.6, 3+3 Lift, 33"MTs, 5:83s, LWB brakes, Winch, Snorkel, Safari Rack
1986 SJ413K PickUp, 1.6L conversion.

OBD1 - Full diagnostics on a PC/Laptop: http://www.rhinopower.org

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Offline SnoFalls

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Re: Load sensing proportioning valve troubleshooting
« Reply #12 on: July 19, 2007, 07:05:26 AM »
it's on models that have the RWAL (rear wheel anti-lock).
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Offline Rhinoman

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Re: Load sensing proportioning valve troubleshooting
« Reply #13 on: July 19, 2007, 09:58:28 AM »
it's on models that have the RWAL (rear wheel anti-lock).

That explains that - we didn't get RWAL either. We had a Cadence Compatible Braking System. If you want to brake hard in slippery conditions you just pump the pedal really fast  ;D ;D
« Last Edit: July 19, 2007, 10:01:36 AM by Rhinoman »
2000 Vitara 1.6, 3+3 Lift, 33"MTs, 5:83s, LWB brakes, Winch, Snorkel, Safari Rack
1986 SJ413K PickUp, 1.6L conversion.

OBD1 - Full diagnostics on a PC/Laptop: http://www.rhinopower.org

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Offline SnoFalls

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Re: Load sensing proportioning valve troubleshooting
« Reply #14 on: July 19, 2007, 10:20:03 AM »
yea, the RWAL is worthless anyway ... but the proportioning valve may come in handy when I eventually go to rear discs  ;)
I don't suffer from insanity, I enjoy it.

Buy-it, Build-it, Beat-it, Part-it