Brake troubleshoot help.

Hello people.

Im getting a short grind sound when coming to a stop and its followed by an electrical whir that sounds like its coming from the proportioning valve on the passenger side.
Front brakes and rotors are in good shape. They dont grind at all except for about a 1 sec blurp (almost sounds like a fluid issue in the system and its forcing bubbles through) when coming to a complete stop… any ideas??

There is some movement in the pedal for a second during the sound.

 

When is the last time you did a brake fluid bleed?

 

I re-plumbed the whole rear end about 4 months ago and bled everything at that time

 

ABS brakes yes or no??

 

Yes ABS. No ABS lights on though