03-30-2019, 12:27 PM
|
#1
|
|
Member
|
|
Join Date: Aug 2011
Location: usa
Posts: 81
|
|
|
Member
Join Date: Aug 2011
Location: usa
Posts: 81
|
What is this thing? [SOLVED - Load Sensing Proportioning Valve]
What is this thing? Having brake issues on a 2000 4runner. It has a bleeder screw and seems to be attached to a brake line.
|
|
 Reply With Quote
|
|
03-30-2019, 12:38 PM
|
#2
|
 |
Senior Member
|
|
Join Date: Mar 2014
Location: New Jersey
Age: 56
Posts: 1,963
Real Name: John
|
|
|
Senior Member
Join Date: Mar 2014
Location: New Jersey
Age: 56
Posts: 1,963
Real Name: John
|
Quote:
Originally Posted by quatin
What is this thing? Having brake issues on a 2000 4runner. It has a bleeder screw and seems to be attached to a brake line.
|
__________________
SILVER 2000 4runner Limited TOTALED 
WHITE/SILVER 1999 4runner Limited l Rear Locker l Tundra/890 coils | 5100 Bilsteins all around | Sonoran Steel Bumpstops l 199 mm Tundra brake upgrade | SCS Matte Gray Ray10 Rims | 275 70 17 BFG KO2 tires | LR UCAs | EIMKEITH panhard brackets | LED interior upgrade l Rear LED tailights l Pioneer AVH-X5700BHS Alpine Type "R" speakers NVX JAD800.4 Class D Amp Kenwood Under seat Subwoofer l Front window tint 20% l Weathertech window visors and floormats l OutGear Solutions Full Length roofrack l Morimoto 40" LED lightbar
|
|
|
Reply With Quote
|
|
03-30-2019, 12:46 PM
|
#3
|
|
Member
|
|
Join Date: Aug 2011
Location: usa
Posts: 81
|
|
|
Member
Join Date: Aug 2011
Location: usa
Posts: 81
|
Last edited by quatin; 03-30-2019 at 12:48 PM.
|
|
|
Reply With Quote
|
|
03-30-2019, 02:00 PM
|
#4
|
 |
Elite Member
|
|
Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,277
Real Name: Tim
|
|
|
Elite Member
Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,277
Real Name: Tim
|
Quote:
Originally Posted by quatin
|
LSPV. Load sensing proportioning valve. It adjusts how much fluid pressure goes to the rear brakes based off the load on the rear of the vehicle. When the load is higher, I believe it will allow more fluid pressure to the rear brakes to increase the braking power. When the load is lighter, it doesn't allow as much fluid pressure to decrease the amount of of braking force to the rear tires to prevent locking of the rear wheels.
__________________
"My old man is a television repairman, he's got this ultimate set of tools. I can fix it!"
Last edited by mtbtim; 03-30-2019 at 02:04 PM.
|
|
|
Reply With Quote
|
|
03-30-2019, 05:00 PM
|
#5
|
|
Member
|
|
Join Date: Aug 2011
Location: usa
Posts: 81
|
|
|
Member
Join Date: Aug 2011
Location: usa
Posts: 81
|
Quote:
Originally Posted by mtbtim
LSPV. Load sensing proportioning valve. It adjusts how much fluid pressure goes to the rear brakes based off the load on the rear of the vehicle. When the load is higher, I believe it will allow more fluid pressure to the rear brakes to increase the braking power. When the load is lighter, it doesn't allow as much fluid pressure to decrease the amount of of braking force to the rear tires to prevent locking of the rear wheels.
|
Thanks. Can't believe I've never noticed it before. $400 for a little valve assembly ouch. Do you know if this valve can cause a hard brake pedal if the piston locks up somehow?
|
|
|
Reply With Quote
|
|
03-30-2019, 10:13 PM
|
#6
|
 |
Elite Member
|
|
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
|
|
Elite Member
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
Whoa, I've never seen one of those before. And I've owned a 98, 99 and 02. Weird.
|
|
|
Reply With Quote
|
|
03-31-2019, 08:14 AM
|
#7
|
 |
Member
|
|
Join Date: May 2015
Location: St John Virgin Islands
Posts: 742
|
|
|
Member
Join Date: May 2015
Location: St John Virgin Islands
Posts: 742
|
They have been on every tacoma I have seen. Never have seen one on a 4Runner. Maybe it was something they put on a tow package
__________________
1997 SR5 4x4
R150f swap E-locked 4.30 gears
Tundra 231 brakes LC 80 rims 285/75/16
2001 SR5 4x4
|
|
|
Reply With Quote
|
|
03-31-2019, 10:41 AM
|
#8
|
 |
Member
|
|
Join Date: May 2013
Location: Las Vegas, NV
Posts: 618
|
|
|
Member
Join Date: May 2013
Location: Las Vegas, NV
Posts: 618
|
Models without ABS had a LSPV. If you have ABS, you do not have one.
__________________
97 4runner 3.4l, 5spd, 4wd trd s\c, urd 7th injector, tc upper arms, Fox 2.5" extended travel coil overs, Icon 2.5" piggy back rear shocks, ome 2" lift rear springs, fj cruiser wheels,custom front skid, Modified trail gear rock sliders, tundra brakes, 275/70r/17 bfg AT ko2, true track, Corbeau sport seats, trs h1 hid retrofit.
2011 BMW 135I 6spd
2009 Lexus LX570
|
|
|
Reply With Quote
|
|
04-01-2019, 12:47 AM
|
#9
|
|
Elite Member
|
|
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
|
|
Elite Member
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
Quote:
Originally Posted by turbo8
Models without ABS had a LSPV. If you have ABS, you do not have one.
|
That would be why!
|
|
|
Reply With Quote
|
|
04-01-2019, 08:33 AM
|
#10
|
 |
Senior Member
|
|
Join Date: Jun 2016
Location: MS
Posts: 2,508
Real Name: Mark
|
|
|
Senior Member
Join Date: Jun 2016
Location: MS
Posts: 2,508
Real Name: Mark
|
I have only owned limited models 96 & 01 both ABS, have looked at all in the yards never seen this on a Runner.
Must be on the cheapest optioned Runners you could buy.
@ quatin
, just curious what frame code do you have?
|
|
|
Reply With Quote
|
|
04-01-2019, 04:29 PM
|
#11
|
 |
Member
|
|
Join Date: Dec 2016
Location: Winter's wonderful
Posts: 305
|
|
|
Member
Join Date: Dec 2016
Location: Winter's wonderful
Posts: 305
|
Adjust the fluid pressure by changing the A or B length.
1. Low pressure - Lengthen A, B
2. High pressure- Shorten A, B
HINT: Fluid pressure change for one turn of the lock nut is 100 kPa (1.0 kgf/cm2, 14 psi) and fluid pressure change for 1 mm (0.04 inch) sliding of the adjust bolt within the long hole position is 40 kPa (0.4 kgf/cm2, 6 psi).
Initial set length (Unladen): 222.5 mm (8.760 inch)
__________________
|
|
|
Reply With Quote
|
|
04-01-2019, 06:15 PM
|
#12
|
|
Senior Member
|
|
Join Date: May 2015
Location: north east of Fairbank out there in the frontiers Alaska
Posts: 3,167
Real Name: 3 Bears
|
|
|
Senior Member
Join Date: May 2015
Location: north east of Fairbank out there in the frontiers Alaska
Posts: 3,167
Real Name: 3 Bears
|
I have not seen one befrore….thankfully....one less thing to bleed or worry about with my brakes
__________________
2000 SR-5 Highlander version 4:30's, factory locker , green, bought 6/21
2001 SR-5... bought 11/20..sold 6/21....
2000 SR-5 moded, lifted, e locker, other cool stuff, totaled 10/20
|
|
|
Reply With Quote
|
|
04-01-2019, 10:39 PM
|
#13
|
 |
Member
|
|
Join Date: Oct 2016
Location: Los Angeles, CA
Age: 36
Posts: 223
|
|
|
Member
Join Date: Oct 2016
Location: Los Angeles, CA
Age: 36
Posts: 223
|
Quote:
Originally Posted by quatin
Thanks. Can't believe I've never noticed it before. $400 for a little valve assembly ouch. Do you know if this valve can cause a hard brake pedal if the piston locks up somehow?
|
What exactly do you mean by "hard brake pedal?" Is it hard to depress the brake pedal all the way from the top of it's travel? Are you feeling a hard pedal but not getting much braking force?
If I was trouble shooting my braking system, the proportioning valve definitely wouldn't be in the top 3 things I would check first while diagnosing.
If you provide some more details of your issue, we might be able to provide some more guidance.
|
|
|
Reply With Quote
|
|
04-02-2019, 11:05 AM
|
#14
|
 |
Senior Member
|
|
Join Date: Oct 2016
Location: Atlanta
Posts: 2,257
|
|
|
Senior Member
Join Date: Oct 2016
Location: Atlanta
Posts: 2,257
|
You can bleed that little guy along with your brakes. My rig is non-ABS and has one too. I always bleed it as the last step of the process.
@ SaulG
good info on the specs of the LSPV. I've seen adjustment brackets on leaf sprung axles that raise the connection point so the LSPV can't tell the suspension has been lifted. Without the adjustment it doesn't send much pressure to the back wheels. I wonder if something similar is necessary for coil sprung vehicles like ours?
|
|
|
Reply With Quote
|
|
04-02-2019, 12:00 PM
|
#15
|
|
Elite Member
|
|
Join Date: Mar 2016
Location: Pasadena, CA
Posts: 5,409
|
|
|
Elite Member
Join Date: Mar 2016
Location: Pasadena, CA
Posts: 5,409
|
Quote:
Originally Posted by JZiggy
I wonder if something similar is necessary for coil sprung vehicles like ours?
|
Yes! Same deal - you want the brake bias to match stock when unloaded (or, if you really know your brakes, maybe adjusted from there).
It just isn't talked about much on here because so few were non-ABS. Kinda like all those discussions of crank windows. 
-Charlie
__________________
'99 4Runner SR5 Auto - 4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
Previous: '88 Camry Alltrac LE 3S-GE BEAMS, 90 Camry 3S-GTE, 90 Camry DX, '03 WRX wagon, '08 Outback XT
|
|
|
Reply With Quote
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|
Linear Mode
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/CRLED.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/baselayer.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/suncent.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/trail4r.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/auxito2.png?abc)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/lasfit2.png?abc)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/4runnerlifestyle2.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/boslla.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/sherpa.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/oemaudioplus.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/orangebox.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/frontrunner.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/bossstrongbox.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/urd.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/treadwright.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/lfd_offroad.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/rcioffroad.png?2)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/drzoffroad.png?1)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/wheelersoffroad.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/victory4x4.png?1)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/sidetracked.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/venomrex.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/rpmfab.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/adamsrotors.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/accessorides.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/battleborn.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/sso.png)
![What is this thing? [SOLVED - Load Sensing Proportioning Valve]](https://www.toyota-4runner.org/images/vendors/cbioffroad.png?xy)
