2006 Tundra Limited brake failure

Lost brakes… completely. Leak from a corroded line. There was still fluid in the reservoir but it was low.
Mechanic said that there should have been ‘some’ braking, even if one line fails there should be stopping power.

Can someone explain what he meant with more detail? Concerned about what this may cost and absolutely frightened by not having ANY stopping power (parking brake does function*).

*used to a hand brake… need to remember to use my left foot.

 

He was blowing smoke. The brake systems in these are tied together front and back. If you lose pressure at one, the whole system suffers. In that event, down shift to lower gears and use the foot pedal emergency brake.

 

Yup, been to that movie...had a happy ending (I didn't die!). I was in a parking lot so I was able to limp home using the e-brake. I've got lots of shiny new brake lines now, and every time I work on something else I replace more (ie. I just replaced the rear axle bearings, so I bought all new brake lines from the soft line to the wheel cylinders, and new cylinders as well). I have just a few sections left of original line left. It looks OK, but I'll change it as soon as I get the chance.

My driving behavior has changed as a result. I no longer expect the brakes to stop when I want them to, so I leave mush more distance between the cars ahead of me, and I anticipate my stops so as to minimize "panic stops".

 

What does the proportioning valve do?

 

the valve is supposed to adjust rear braking performance to prevent lockup during loaded or unloaded conditions. No weight in the rear? Less braking to rear brakes. Loaded down? More braking to the rear.

 

LSPV is normally here, this photo is taken from the passenger side drum. It's attached to the arm you'll see in the 1st pic of this thread. Not all 1st gen Tundras have this armature etc.
Swapping out the LSPV for a manual valve is a semi-common upgrade. Failure to bleed the valve using its bleeder is a common source of braking problems.

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Mechanic was correct about dual MC. One chamber supplies one front wheel and opposite rear. Other chamber supplies other front and opposite rear.

 

Apparently the LSPV is rusted to bits. Mechanic is understaffed and I hope to have this back by Thursday.

Thanks for the shared knowledge

Curse the overly salted roads of Wisconsin.

 

CHECK YOUR FRAME! Especially the upturn portion underneath the brake booster. Oh, and read this thread: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/

 

Frame looks bad. According to Toyota a previous owner had: : Limited Service Campaign D0D (Specific 20 Cold Climate Stats Only) - Certain 2004 - 2006 Model Year Tundra Vehicles - Corrosion-Resistant Compound Application to the Vehicle's Frame done in 2014.

might be time to sell…. “Brakes are like new!”

 

It says corrosion resistant but it means corrosion accelerator.

 

Yeah, that action from a previous owner just nixed your ability to cash in on the frame recall, which would've cost you money either way.

 

Mechanic is grossly understaffed, in the past his work was top notch…. Concerned about his stress level with only his son and he running stuff.

He handed the truck back to me proclaiming, ‘something still isn’t right’. He also stated he repaired the parking brake, so chances are good I won’t die if this happens again. (Also haven’t paid him anything yet).

Looking for sage advice/ schematic from ye olde guru’s here. He is ass-u-mining that brake lines have been replace before and something is incorrect in the routing. Allegedly there is a hydraulic reservoir in front of MC and one behind the MC and that travels to the LSPV. He can’t find any resources other than there is a customer with the same truck and he going to see if she can bring it in.
So he can capture some pictures.

My hydraulic skills are right up there with an Amish guy in a Radio Shack store… any guidance to routing schematics would be GREATLY appreciated.

 

Grab a copy of the service manual for your truck. It’s in the link I provided.