Update on brake issue

Update on brake issue. NO pressure to drivers right wheel. Disconnect the house from line and no pressure there so follow up to what I think is a "Hydraulic control unit" Thats what I found one place calling it.

There is the line coming out of the master cylinder, it goes into this block and from this block the 4 lines come out to the wheels. All 4 lines coming out are on the same side, not the proportioning valve.

So I see the two lines coming out heading to the back. I have someone depress brake pedal and crack a line and fluid comes out quick and I close it. I to to the other line in the back and same thing. But when I crack this line at the block hardly anything comes out.

So I think I have my problem, this hydraulic control unit. I had a friend tell me that that means my ABS system is bad. But I want to make sure as that is not a cheap issue or is it just this HCU?

The abs light has been on since I purchased the vehicle 3 years ago.