How do I fix ABS and TC failure code P1590 brake light turn off when pump charge.

I had a problem with the preassure reducing valve and had no rear break for a while. During those days the 2 lights came on and since I'm getting the ABS and TC failure on the dash. The scanner show P1590 Rougth driving etc. code.
How can I fix it?
Could it be air in the rear lines on the hole system? No bubbles when replace the valve.
Could it be an ABS sensor?

The other thing that I notice is that when the light doesn't show at the start of the vehicle it seems to activate the ABS or TC every time I hit the brakes.

I used a scanner that has something about ABS write on it but it gave me no aditional data.

Can I find what happend without buying another scanner?

Please Help

According to my crystal ball, you are talking about a P38? If so, you my need to bleed the brakes using the proceedure in RAVE, a bit more complicated than a normal brake bleed.

Datatek said:

According to my crystal ball, you are talking about a P38? If so, you my need to bleed the brakes using the proceedure in RAVE, a bit more complicated than a normal brake bleed.

Click to expand...

Will try it this weekend to see what happend

run the full procedure and the alarm still there. Did notice that the rear passanger side released a lot more fluid that the driver side. it almost empty the receviour.

could it be a dirty sensor? I found this on another site:
The ABS sensors / P1590 | Discovery 2 V8 - A budding enthusiasts story

I do have a leak on the passanger fron diferetial that has the wheel and all the components full of diferential grease.