3rd abs module, 3rd brake failure... wrong repair?

My 2008 worked fine yesterday, but as soon as I opened my door this morning, the brake alarm beeped incessantly. Sure enough, I got the vsc, abs, and (!) lights on the dash, along with no brake power except to the rear drums. I hear the ABS module clicking when I depress the pedal (as well as the pump whirling), and when I do, the pedal forcibly pushes back toward me.

Shorting OBD pins 4 & 5 and starting the car with 8 pedal pumps to reset the ABS didn't help. And when I do that, the traction light blinks out codes 21, 22, and 24. (I have not done blink code diagnostics before).

I DIY replaced my abs module for the 3rd time about 2 months ago (used ebay unit). I didn't use techstream to bleed the brakes for either replacement, just a buddy pressing the brake pedal while popping open each wheel's bleeder valve until no more bubbles. Doing this along with shorting OBD pins 4&5 seemed to restore the car to working order until it suddenly didn't work at all.

Aside from hearing the abs accumulator pump working frequently at stops, the brakes showed no signs of performance slippage before suddenly failing. The failure a few months ago happened after my car had been sitting in a parking lot on an unusually hot day. And today's failure happened right after our first cold & rainy day in months... Neither failure happened while driving, only after the vehicle had been off for several hours.

I'm beginning to wonder if my issue isn't the ABS accumulator assembly itself, but something else. (Maybe lingering air bubbles in the brake lines responding to temperature changes?)

Any advice? I love my Prius but I'm at my wits end with this recurring issue.

 

Definitely possible, but I think it's a low chance that 2 would go bad within 5k miles of owning them.

 

No, the ECB light blinks steadily in tandem with the VSC and ABS lights. Could the traction control be sending the same codes or is it part of a different system/convention?