Brakes

I have a 92 Park Ave and the right front brake caliper will squeeze then release pressure even while holding the brake pedal down, which does not go to the floor, the left front brake is doing most of the stopping. I have bleed that caliper but still same problem. Is the ABS module proportioning wrong? By the way, the brake pads are brand new.

Ok you have the car off the ground, front, someone applies the brake, the rf is locked and with the same pressure applied on the pedal, that caliper backs off, the lt ft does not, is this the scenario.

Yes, the left front works fine and if you watch the right side caliper, you will see the pads squeeze the rotor and then the caliper releases pressure and the pedal is held the whole time.

Ok, disconnect the wheel speed senslr on that wheel, drive till the abs lite comes on, see what happens then, when brakes are applied

Only thing I can think of is a leak, bad BPMV, or M/C......this is a diagonally split system....

Ok, disconnected the ABS wheel sensor earlier today, The ABS light came on as soon as I started the car and there was no change when I drove it @ 5 miles. I did go on a dirt road and made a few passes while someone watched all four tires. 3 locked up until the ABS kicked in (literally) the right front did not lock. There are no leaks at the caliper and the rubber hose does not bulge. How can I make sure a piston or solenoid is not sticking in that ABS valve assembly? Is there a way to manually reset? Thank you for your help. No ABS light, except when I disconnected the sensor.

Update- I went outside with a flash light and saw there is a slight master cylinder leak. It is in the "shadow" of the master cylinder of course so I did not see it earlier. My next question is that since it is a 2 line MC, is how can that affect just the right front brake? And what is the steps (if necessary) to setup the ABS module for bleeding, without a scan tool?