Rear brakes lock up?

I posted this before. 4 times to Toyota dealer. Mechanics re-adjust the brakes, on the fourth time I had new e-brake cables in stall.

Today 3 times passenger side brakes lock up ( only in 4-wheel H & L. Dirt road ( Very slippery)
As I made a right turn the tires on the passenger side would slip, then the brakes lock up, need to reverse to free, drive a few more feet, locks again, reverse to free.
It seems when the passenger side tires starts to spin, the brakes lock.

I try pressing the anti-slip off but the problems re-incur, lock up.

Any ideas? Toyota mechanics mention computer do not control the brakes? But I think it does?

Help!
Aloha

 

Sounds like the traction control might be messing up. Not sure how to fix it

 

Thank you. I will mention this to the mechanics at Toyota.

That makes sense, hapoen when I lose traction, locks the passenger rear wheel.
Aloha

 

My thoughts are:
How tight are they adjusting it? It's supposed to be tightened until lock then backed off 15 clicks. I've seen videos of Toyota techs tightening until slight drag and call it done.

Does it occur while turning? You mention a 2.5" lift in another thread... Have you, at any point, had the steering angle sensor recalibrated? Do any warning beeps/buzzers sound?

Have you had axle checked if it's bent? This manifests as out of round drums.

 

Possible locking rear differential issue?

 

I am writing your suggestions for Toyota dealer to look at.
Thank you