I have a 95 Dakota (5.2 V8, 5 spd manual) with many, many miles on it.
Recently one of the brake lines broke, it was the one that goes from
the front at the MC to the back axle where it tees off to the drums. So
I lost my back brakes and wow I was surprised at how much stopping
power I'd lost, even with the front discs still working.

I was on my way to work, which is about 45 min drive away from home and
I was almost there. To get myself back on the road asap, I eased it
over to the nearest Monroe shop and had them replace the line (from the
MC to the rear axle tee), refill the brake fluid, bleed the system,
etc....

I had the stopping power back, however it wasn't until several days
later that I noticed the rear wheels would lock up, and sometimes it
doesn't take much to make them lock. Just a quick, somewhat firm press
of the pedal will make them chirp as they lock up. I have rear ABS
only, and the ABS light is not on or anything like that. It seems the
ABS is still functioning as I still hear a clicking sound when I use
the brakes hard as it's always done. Is it possible something happened
to the proportioning valve? Maybe it got stuck in position to one side
when the line broke and lost fluid? I haven't checked for any computer
error codes (no lights so it would seem okay to me) and I'm assuming
the prop valve is right there mounted next to the MC. Looks like it
anyway. Is there an easy way to check to see if the prop valve is
functioning properly?

Any help is most appreciated!

-Troy