For anyone doing the ABS actuator replacement on their Prius three, I found the process to be pretty easy. Symptoms: intermittent regenerative, breaking and skidding because of the ABS system malfunctioning. Happened after a hard braking, but for months leading up to this I could hear the break accumulator cycling way more than it was supposed to. Before and after the hard braking (to avoid an accident) I could hear a hissing sound under the dashboard. This became worse after slamming on my brakes to avoid a car. When the ABS, Brake, etc light was on after the braking episode the vehicle became dangerous to drive. The C1345 code was then present. Originally I read a lot online about horror stories, including this job and the infamous C 1345 code. Replacing the actuator was actually very simple. All I had to do was remove the windshield wiper, remove the metal shielding under the windshield wipers, remove the two strut bolts that hold on the brake reservoir, place paper towels under all of the plastic tubing, going into the brake, actuator and accumulator, slide back the clips on those pipes, pinch the tubes and lift them up over the level that they will pour out pull out the brake reservoir and drain it. Using a 10 mm wrench untighten the nuts on each of the brake lines. There should be four on the front and one on the left side. In the driver foot well, remove the pin, holding the brake pedal to the actuator. Loosen the four bolts holding the actuator to the firewall. From the engine compartment, side slightly pull back the brake lines and strap them to the small metal bracket behind them gently. Without bending the lines or damaging the flare fittings on the brake lines, wiggle the actuator and gently move the brake lines to remove the actuator. Place the new actuator in its place without damaging the fittings. Replace the fittings snug, but not too tight remember these are compression fittings and they are sensitive to over torquing. Replace the rubber piping and place the clips back into position connected to the brake reservoir. Fill the reservoir over full with brake fluid and a trick is to leave a bottle of brake fluid upside down on the top of the reservoir when you start the bleeding process with the tech stream app. install installing text stream was the most difficult process of this repair. The only method that ended up working for me was to use the pre-made virtual machine with the x horse driver for the USB to serial VCI generic cable. Even if you pay for the Toyota subscription, you might have issues with a generic cord unless you are able to get the drivers working. I’ve read for many hours trying to get this driver to work on both 32 bit and 64 bit machines. Disclaimer. I have not tried to use the subscription service as I intended to test the functionality of the generic cable before purchasing. Once you have tech stream working, you will go to the chassis menu tab click on the ABS column and start the bleeding process. You will need a quarter inch tube to connect to each of the bleeding valves on each of the wheels with the vehicle either on jack stands or by removing each tire individually for each step of the process with a jack, or by using a car lift without removing the wheels. The tech stream program will guide you through each wheel and you’ll need someone or something to hold down the brake pedal during each step for the front wheels pumping the brakes. You will also need to bleed the brake stroke simulator which is located on the actuator bracket on the right side. Catching the brake fluid in a container and using a clear tube to see when there is no more bubbles coming out of each bleeding nipple. I used 2, 32 ounce bottles of DOT3 brake fluid to purge the system. The process might fail multiple times, but keep on trying and use a battery tender to keep your 12 V battery voltage optimal. The step that is often overlooked is in the same menu as the ABS bleeding procedure. There is a EBC (ECB) procedure to learn the linear actuation. The parking brake must be off for this to activate. You must have the parking brake on during the brake bleeding process which is separate from the linear calibration to remove the C 1345 code and must be done first. After you calibrate, the linear actuator all your warning lights should be off. During the linear calibration, you should hear clicking of the ABS module. I hope this helps someone! I was able to figure it out in two days and I did not need to replace the accumulator.
