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Old 04-08-2019, 01:17 PM #31
quatin quatin is offline
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Quote:
Originally Posted by 19963.4lsr5 View Post
There is a special procedure to adjust the ebrake bell cranks which effect the brake shoe adjustment.


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Do you happen to know where to find that info? I've been googling all around and can't find the specific procedure. There's a nut inside the parking brake lever, plus there's a bell crank on the outside of each drum.
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Old 04-08-2019, 01:38 PM #32
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Old 04-08-2019, 11:09 PM #33
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Quote:
Originally Posted by Nate_GB View Post
The parking brake and the hydraulic braking system are completely separate systems all the way up to the point of the actual brake shoe engagement inside the drums. So the fact that you say that parking brake use effects the situation leads me to believe that the brake shoes inside the drum are not installed correctly. There's lots of adjusters and springs and small parts that have to be in the correct place to function properly. I'd be willing to make a heavy bet that's where your problems lie. I'd start by removing your drums and comparing what your setup looks like to a known correct setup photo.

Post a photo of each side with the brake drum off and we should quickly be able to tell you if something is way off.
Adjusted the bellcranks tonight so I took some pictures. I didn't see anything out of place, but could use another set of eyes. I also notice my new shoes has some funny wear marks after 30 miles of driving already. I can now feel some light grooves in the drum that I'm not sure were there before. Guess I have to go get new drums or have them turned.
Attached Images
What is this thing? [SOLVED - Load Sensing Proportioning Valve]-driverdrum1-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-driverdrum2-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-driverdrum3-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-passdrum1-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-passdrum2-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-passdrum3-jpg  What is this thing? [SOLVED - Load Sensing Proportioning Valve]-shoemarks-jpg 
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Old 04-09-2019, 10:45 PM #34
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Quote:
Originally Posted by quatin View Post
Adjusted the bellcranks tonight so I took some pictures. I didn't see anything out of place, but could use another set of eyes. I also notice my new shoes has some funny wear marks after 30 miles of driving already. I can now feel some light grooves in the drum that I'm not sure were there before. Guess I have to go get new drums or have them turned.
Are those grooves worn in the new brake shoes or just streaks? The hardware looks to be set up properly from what I can see. The way I usually adjust the rear brakes is to turn the adjuster with a flat head screwdriver through the backing plate until there is just the slightest amount of drag on the drums. Assuming the brakes are setup properly, are you getting good fluid flow through the bleeder valves while bleeding?
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Old 04-09-2019, 11:58 PM #35
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Quote:
Originally Posted by Nate_GB View Post
Are those grooves worn in the new brake shoes or just streaks? The hardware looks to be set up properly from what I can see. The way I usually adjust the rear brakes is to turn the adjuster with a flat head screwdriver through the backing plate until there is just the slightest amount of drag on the drums. Assuming the brakes are setup properly, are you getting good fluid flow through the bleeder valves while bleeding?
Those are streaks. I do the same thing on adjusting the drums, then I pump the hand brake until I don't hear the automatic adjuster clicking. I did get decent fluid flow eventually when I bled the drums. I have a brake bleeder hand pump, but we had to try the pump the brake pedal method a few times to get things going. (again a sign of a tripped valve?) I did notice the LSPV bled much easier than the wheels. I feel like the calipers bled easier than the drums too.
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Old 04-14-2019, 01:01 PM #36
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Update:

Replaced drums: No effect

I pulled the LSPV valve off and it appears the piston (red rod thing) is seized. I would assume some type of spring like response from it, since it is connected to a lever with the load spring. There's about 1/8''-1/4'' of play on the piston, but you need to press/pull hard. Once it's in, it stays in, once it's out it stays out. There's also a bypass valve that somehow rides ontop of this piston, so perhaps that part is seized too? Seems like I need to replace it regardless, so hopefully this is my problem.
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What is this thing? [SOLVED - Load Sensing Proportioning Valve]-20190414_123039-jpg 
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Old 04-21-2019, 10:22 PM #37
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Final update. Replaced LSPV and problem resolved. I'm still unsure how the system works, because even with a new valve, the lever is in a permanent up state, so I don't understand how it's supposed to adjust load, when a loaded chassis will make the lever go up even more?

Anyhow, for anyone replace theirs, remove the spare tire first or you can't see the brake line coming from the MC. I cross threaded the fitting for that brake line working blind. I had to chase it down with a die cutter. Turned a 20 minute job into a 2 day job.
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Old 10-10-2019, 01:16 PM #38
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Quote:
Originally Posted by quatin View Post
Final update. Replaced LSPV and problem resolved. I'm still unsure how the system works, because even with a new valve, the lever is in a permanent up state, so I don't understand how it's supposed to adjust load, when a loaded chassis will make the lever go up even more?

Anyhow, for anyone replace theirs, remove the spare tire first or you can't see the brake line coming from the MC. I cross threaded the fitting for that brake line working blind. I had to chase it down with a die cutter. Turned a 20 minute job into a 2 day job.
Quatin,

I know this thread is a few months old. I was wondering if you could provide the part number for the LSPV you replaced. My 2000 4Runner is having the same problem. But looking online, my LSPV looks different than the others I see out there. Yours is the only one that looks like the one I need. Hope you remember. Thanks in advance!!
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Old 05-12-2020, 11:46 AM #39
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Rear Brake Proportioning Valve

reviving an older thread. I have a 1999 Toyota 4runner 2wd base model with the Rear Brake Proportioning Valve . my 4runner is lifted 2.5 inches and ive read that lifting a base model will cose the brake light to turn on and off. is there a way to fix this besides from pulling the light fuse? just kinda of annoying to see the light pop on and off lol.

also anyone tried the Revtek Rear Brake Proportioning Valve Relocate Kit for 1996-2004 Toyota Tacoma to fix this problem?
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Old 02-28-2021, 03:40 PM #40
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Quote:
Originally Posted by cejaslocas View Post
Quatin,

I know this thread is a few months old. I was wondering if you could provide the part number for the LSPV you replaced. My 2000 4Runner is having the same problem. But looking online, my LSPV looks different than the others I see out there. Yours is the only one that looks like the one I need. Hope you remember. Thanks in advance!!
Sorry for such a late response. For future reference:

47900-35493 Pressure Metering Valve

$260 part and no aftermarket that I could find since it's rarely installed. I was able to revive the old valve by playing with the piston, so I kept it as a back up just in case.
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Old 02-28-2021, 03:42 PM #41
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Quote:
Originally Posted by Rsina89 View Post
reviving an older thread. I have a 1999 Toyota 4runner 2wd base model with the Rear Brake Proportioning Valve . my 4runner is lifted 2.5 inches and ive read that lifting a base model will cose the brake light to turn on and off. is there a way to fix this besides from pulling the light fuse? just kinda of annoying to see the light pop on and off lol.

also anyone tried the Revtek Rear Brake Proportioning Valve Relocate Kit for 1996-2004 Toyota Tacoma to fix this problem?
I believe you add an extension arm to the existing lever arm. You probably have to make it yourself and play with the length until the lever is fully down unloaded.
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Old 04-09-2021, 12:44 AM #42
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Can you Provide Detail on on how you revived Old Valve? I think i am in the same boat you were in. Can this be done while attached to the vehicle?
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