ABS module only sending braking pressure to one wheel

99 Taco 3.4 v6 SR5 TRD ABS light is on. Im only getting brake pressure to the front passenger tire. zero pressure at other calipers, no fluid comes out when trying to bleed via pushing break pedal. ABS pump does function if I slam the brakes in gravel or wet road, as I can hear it operating, but still no pressure to other wheels afterward. Any ideas where to start ? Im fully capable of a removal / teardown of the unit or other components. I am not against a full removal of the unit and installing a bypass with manual proportioning valve or similar. Thanks.

 

Going to get expensive .

Have anyone that can read the ABS codes if you want to trouble shoot and repair or replace .

As simple as Rust blocking the lines??

 

What about disconnecting line and working towards the MC while checking for pressure at each connection?

Soft line to hard line
Hard line to pump

 

I have verified that there are no clogs in the lines, and my rear proportioning valve is ok too. I believe that this is a solenoid issue in the ABS module. I cant find any info on how to service it, internal diagram etc, as Toyota says that it is not serviceable, and Im sure not gonna drop 2K on a new one.

 

ABS delete....