Brakes Locking Up (Solved)

Today May 21, 2019. 3 times to Toyota dealer to find why rear passenger brakes lock up. They clean, lube and re-adjust the brakes.
4th time I had the E- brakes cable replaced $398.00 ( dealer gave me a break) no pun intended.

Today ( raining hard for two days) coffee farm, road were wet , slippery, 4H , driving slowly making a right turn, could feel tires slip, bam! Rear passenger brakes lock up. Reverse to free.
Drove a few more feet, bam! Passenger rear brakes locks up, reverse, happen one more time.

Mechanic tells me computer are not connected to brakes? Anti slip button i think is connected? I push they anti slip controls off, but it happen again, passenger brakes lock up as the tire spins.

Some one mention due to the lift? Only 2.5 inch lift. Replace the rear brake cable to longer cables.

Help! I will visit the Toyota dealer again.
Aloha

 

First off, I have a 4" lift and still have the stock E-brake cable and brake lines. Only need longer ones for 6" and up.
Second off, to me it sounds like it's the traction control ECU because that's the only computer that controls applying Brake pressure completely separate from your foot.

Get some dielectric degreaser, jack up the rear passenger, find where all the electrical hook-ups connect to the drum, degreaser all the connections (should be only 1 or 2), and place back in securely. If you want to take it a step further since you're down there, try to follow the lines underneath and degrease any hookup you can find.

The actual mechanical parts are fine since it only happens on rainy days. My issue was it would rain/snow then freeze the e-brake cable overnight because there was a kink in it. Your issue sounds like a short in the traction control.

If this doesn't work, start at where you think the problem is. Disconnect the transfer case actuator (this will throw up a dash light and shut off traction control) and drive around for a few days. See if it ever does it again. Otherwise, you can check the fuses for the 4wd ecu / abs (abs pump controls traction control). I think the interior one is
And the exterior one is

 

Thank you I will share this with the Toyota dealer.
Great suggestions!
Aloha

 

2020 TACOMA TRD PRO Rear brake were locking up for no reason..EASY fix ...spring of parking brake cable was stock and just by touching( put 1 or 2 finger were arrow shows CLICK back to its place.

 

I just read through this thread because I have the problem of my rear brake locking up. I had everything replaced about a year ago and I still have the problem from time to time. It only happens about once every two or three months. I never use the parking brake and it happens in even warm weather so it is not freezing. I usually happens after I have stopped at a stop light and usually shortly after I have left home, usually 1/2 to 1 mile from home. Putting the truck in reverse and backing up a few feet releases the brake. Sometimes it takes a couple of times.

2013 Tacoma. Manual transmission. I only drive about 10-20 miles per week so rust is a possibility. I have not had much luck with local mechanics and my experience with the local Toyota dealer has been so bad that I swore that I would not go back to them. I am probably going to have to take it apart myself but I am getting to the age where that is a problem.

 

Check out this video from the Maintenance Map thread and see how comfortable you feel about taking apart the rear brakes.

https://www.youtube.com/watch?v=-dmUF5hbQEQ

 

It is not really a problem with knowing how, it is a problem with being 85 years old and those wheels now weigh 150 lbs. and the springs take a 50 lb. pull etc. 20 years ago I would have had it apart in about an hour. Now it is a 5 hour job with a lot of coffee breaks. I will probably pull the wheel/drum off and inspect them and if it looks obvious I will probably try. Otherwise it will go to a friendly local mechanic.

One thing that I did not think about which showed in the video is putting anti seize on the moving parts. I can probably do that without complete disassembly. If the problem is rust from just setting as I suspect that could solve the problem.

Thanks