The issue here sounds like it's the master cylinder failing. It is not retaining pressure when the engine is running. The reason they feel fine when the engine is not running is because the failing master cylinder is not getting power, and in essence is being bypassed.
no
brakes?
fordparts.com shows disc brakes on the front of a 1988 Ford Ranger
Some models of Ford Ranger have ( 9 inch ) rear drum brakes
is it front or rear
The bleeder valve for the brakes on a 1997 Ford Ranger is located in the brake line where it meets the brake disc. The wheel will have to be removed to access the bleeder screw for drum brakes.
Buy a service manual and read it.
drl module location on a ford ranger 1995
Check the pistons inside the calipers, usually they are the reason brakes lock up.
The 1992 Ford Ranger did not come equipped with daytime running lights.
It is important to maintain your brakes properly. The minimum brake rotor thickness for a 2003 Ford Ranger is 0.99 inches.
Depends on your Ranger, the non 4 wheel drive take 9 inch rear brakes. The 4 wheel drive Rangers take 10 inch brakes.