I'm having a problem with my brakes. I'm trying to troubleshoot the issue. The symptom is that the brakes progressively lock up by themselves after driving a short distance.

Below is a Technical Service Bulletin describing a brake light switch issue leading to continuous pressure to the rear calipers. If this were the problem, ie the brake switch needing adjustment, would this cause the the brake lights be on without touching the brake pedal?

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Check rear braks TSB

ISSUE
Premature rear brake pad wear (in less than 3000 miles) is due to the brake pedal sticking and applying continuous low pressure to the rear calipers. Brake pedal sticking can be caused by over-tightening the pivot bolt or incorrect setting of the brake light switch.
ACTION
Use the procedure below to correct the problem.
SERVICE PROCEDURE
Loosen the nut for the brake pedal pivot bolt 1/2 turn.
Re-set the brake light switch as follows: Loosen the switch and adjust switch position so that when the plunger is fully pressed in, there is at least.025 ° clearance between the plunger and brake pedal.
Inspect the rear discs for excessive wear and calipers for possible heat damage. Replace components if necessary.
SYSTEM OPERATION
The initial movement of the brake pedal (3/16" travel) applies 2 bar (29 psi) pressure to the rear brakes only.
The pressure delay valve (located on the L/H inner fender on 89-91 MY vehicles and on the R/H inner fender on 92 MY vehicles) then holds this pressure until the front brake line pressure has reached 8 bar (116 psi).
When the front brake line pressure reaches 8 bar with continued load on the brake pedal, the pressure delay valve opens and increasing pressure is then applied to both front and rear brakes.