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This is a discussion thread titled "Brake Proportioning Valve - Where is it?", within the 1Gen-Tundra forum, part of the Truck Forums category.


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Old 07-17-2008, 11:05 AM
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Default Brake Proportioning Valve - Where is it?

I just bought an 05 crew cab limited (w/ VSC/TRAC) and put a lift on it the weekend I got it. This is my 6th Tundra by the way, but first 05, and I don't see the proportioning valve bolted to the rear axle. I already have my bracket and everything I need to relocate it, which I have always done in the past. The mounting point with the 2 threaded holes is on the back of the axle just to the right of the differential just like all my other Tundras, but nothing is bolted to it. Can someone give me some insight on if it is somewhere else or I am missing something?
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Old 07-17-2008, 12:06 PM
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Default Re: Brake Proportioning Valve - Where is it?

probably in this pdf hope it helps?
pg 79 shows W/VSC mount? looks like shock tower to me?

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Old 07-17-2008, 12:35 PM
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Default Re: Brake Proportioning Valve - Where is it?

If you have ABS and some form of stability or traction control, it is likely this part has been replaced electronically.
More advanced systems can eliminate portioning valve and height sensing valves altogether.
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Old 07-17-2008, 12:58 PM
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Default Re: Brake Proportioning Valve - Where is it?

pdf shows one next to shock tower on frame? not sure what applications this is for but just from what i see in pdf?
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Old 07-17-2008, 01:19 PM
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Default Re: Brake Proportioning Valve - Where is it?

Thanks for that PDF. I will have to pull it up from home and take a look under the truck and see.

Does anyone know for sure if this has to be relocated when lifting the rear?
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Old 07-17-2008, 01:35 PM
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Default Re: Brake Proportioning Valve - Where is it?

isn't it on the axle housing???
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Old 07-18-2008, 12:20 PM
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Default Re: Brake Proportioning Valve - Where is it?

It was never on the axle housing always on the frame, though there should be a rod from the housing somewhere.
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