Adjusted the Proportioning valve

1322 Views 4 Replies 5 Participants Last post by MEvang, May 7, 2007

BaW

Discussion Starter · May 7, 2007

I was looking at adding a little bit more psi to the rear brakes just to stop alittle bit better, people tell me to Adjusted the Proportioning valve to add more bias. I found were its add underneath the drivers rear axle, i was looking all over for the adjustment (got the repair manuel) but i couldnt see it i saw this one thing in the middle that you could adjusted if you had a load in the truck but this was in the middle of the axle just a little adjustment. i was looking on the left side and found this ruber piece to take off but i didnt know if i should take it off or not, well i was wodering if anyone could post pics or help me out some how thanks guys.

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rambrush

· #2 · May 7, 2007

If you are not sure what you are doing maybe better off leaving things be.
Could open a can of worms if things don't go according to plan. Think lawsuits and such if accident happened and killed someone. Warranty issues could be a problem as well.

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integraGSR

· #3 · May 7, 2007

rambrush said:
If you are not sure what you are doing maybe better off leaving things be.
Could open a can of worms if things don't go according to plan. Think lawsuits and such if accident happened and killed someone. Warranty issues could be a problem as well.

:tu: :tu:

i say just make sure your rear drums are adjusted often, like on rotates. i try to keep mines tightly adjusted, makes the truck stop better and is easier on the front brakes. when i go to set the e-brake, it's usually 3-4 clicks in.

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evenfall

· #4 · May 7, 2007

I am still curious as to who "these people" are who "say" to you various things you come here and ask about. Some of what those people say is well, pretty interesting.

Messing with the balance of the braking system is risky biz. Tell you what though, as long as I know that you and I will never be on the same stretch of road...

Really, I think Toyota has this adjustment well in hand. It really isn't something you will improve upon much. If you want better brakes, upgrade the brakes.

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MEvang

· #5 · May 7, 2007

I must agree with the guys here. Properly adjusting this valve requires the use of scales and a hydraulic brake pressure gauge set, in which I highly doubt you have.
Over adjusting the can cause rear brake lock up in wet weather which could cause loss of control.
If you don't think they are working, I would recommend using an infrared thermometer to check the drum temperature after about 10 mile drive. A hot drum indicates they are working.
Mike

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