Anti skid, ABS, “Brake” ((!)) (brake warning) lights are on

Just catching up on this post and have some basic questions:

1. Did you buy a new Master Cylinder Assembly AND the Brake Pump? Earlier in this thread you were talking about buying one of the two parts.

2. The part(s) you installed were not used or reconditioned?

3. The Techstream being used is the hacked version with some low cost interface module?

4. You did the final step of the hv orange insertion? Often people miss the final slide step.

Assuming you bought both brake booster parts new and have all the connectors well engaged, it may be worth it to let the dealer calibrate and bleed it.

These parts are similar for a Prius v:

 

Yes, the ECU is part of the master cylinder/booster/actuator assembly that you changed.

I have completed the bleeding of my Gen 3 using a Tactrix Openport 2 and Techstream, without problems. When I was using a Mini VCI, it would get most of the way through the process, and kick me out during the repeated pump-ups at the very end, and make me start over from the beginning.

Did you buy your Tactrix dongle from Tactrix? The real ones cost $169.

If your hybrid system warning triangle has come on, don't jump immediately to thinking about battery module voltages or battery stuff. Just get the trouble codes to see why the triangle came on. If they are trouble codes having anything to do with battery stuff, then think about battery stuff.

 

Obviously the pump could be bad. They were the original part replaced by Toyota when the brake booster codes started many years ago. Toyota later recommended changing the master cylinder and the separate pump at the same time. When my system ran excessively both were replaced. The pump can leak.

The wrong master cylinder will look the same and have the same housing marks. But the ecu inside will be different. Each year and body type has at least two versions. People buying used master cylinders often fall into this trap because the sellers don't know the difference. Hopefully yours came from a Toyota dealer who verified the part with your vin.

The orange hv plug has to fold and then slide. Some miss the second part and you get a hybrid warning. Nothing works at that point.

 

You can just start with the Health Check button on the opening screen. You'll end up with a screen showing all codes from all systems. You can click on Hybrid Control to drill down.

You're not necessarily looking for "hybrid battery codes". You'll be shown whatever codes from the hybrid control system caused the warning light to come on. There are a couple hundred possibilities. If they turn out to be codes about the battery, then you'll know that. If they're about something else, then you'll know that.

 

There was a recall on that pump assembly for 2010s, T-CP-D0H-A510-D. Even if you don't have a 2010, you can look it up for the procedures and special tools they came up with for replacement, including for dealing with those nuts.

In my notes there's also a video link:
https://techinfo.toyota.com/techInfoPortal/staticcontent/en/videos/cp/D0H_full.wmv