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Discussion Starter #1
I’ve searched every forum imaginable, but I can’t find anyone with the exact same issue as us. Short back story, so bear with me.

Our 2006 Sequoia SR5 has had random brake issues pretty much since we got it back in 2015. The first winter we drove it, the brakes would randomly freeze up, like it was getting zero boost from the brake booster, and the TRAC OFF and VSC TRAC lights would come on at the same time. I borrowed a friend’s scanner and nailed it down to a bad brake booster. At the time we could only afford a remanufactured one, but it fixed the brake freezing/warning light problem.

Fast forward to this year. Now the TRAC OFF and VSC TRAC lights will randomly come on without any other dash lights or any symptoms. Again I used the scanner and got C1223: ABS Control System Malfunction, C1247: Stroke Sensor, and U0100: Lost Communication with ECM/PCM ‘A’. Our scanner lists the recommended fixes as anything from the brake switch to the entire ABS module.

Most of the forum threads talk about the TRAC and VSC lights but also the ABS warning light. I don’t get an ABS warning light or a CEL. I have read that the stroke sensor is inside the booster, so maybe we got a bad booster. I’m kinda stumped.
 

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My TRAC and VSC lights do some on regularly. More so when it is cold outside. Usually, once the truck is warm, I can restart and the lights stay off. My simple OBDII scanner doesn't show any codes (can't read ABS) so I've just been dealing with it.
 

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Discussion Starter #3
Update: I borrowed my friend’s really expensive SnapOn scanner, and along with the other codes it also came up with C1363: Malfunction In Booster Pedal Force Switch. I’m really starting to think that the rebuilt brake booster I bought 5 years ago is bad. It’s out of warranty, so I’m stuck buying a new one. Does anyone want to concur or have any other thoughts?
 

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Sorry, I can't add anything. I haven't encountered this problem with my rig. I don't recall reading any widespread problems with brake boosters for Tundras/Sequoias either.
 

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Discussion Starter #5
The one code that’s bugging me is the U0100, which basically says there is a communication error between the ABS system and the ECU. I put in a remote start system last winter, and part of the install involved splicing in to the CAN Bus wires from the OBD port. Since it only happens when it’s cold outside, I’m wondering if there’s a bad connection there that’s causing the errors. Seems like a coincidence, but I’ll pull the dash this weekend and check all of the connections to be sure.
 

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Had a bad brake booster - I took a chance and bought a used Toyota OEM booster on EBay. It still is working several years later and cost alot less than a new one. Chinese aftermarket stuff is junk.
 
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