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If the motor keeps running, it's because the pressure switch is bad (screwed into the top of the brake assembly) and is not opening up thus the pump never shuts off. If you sit stopped long enough with your foot on the brake the pump will generate so much pressure that the motor will stop and begin to burn up. It should then blow the fuse on the fuse panel, and the pedal will drop. You'll have some brakes, but I wouldn't drive it around in this state. Now if the "brake" light has been flashing on briefly when you step on the brakes, it means the accumilator is going bad. It's the big round ball screwed to the side of the brake assembly.
While you can find these parts seperately, if you go to AutoZone they can order you the entire brake assembly, rebuilt by A-1 Cardone. It's around $200, but has all the parts you need. I would just swap the switch and/or accumulator, and keep the rest of the brake assembly on the shelf. If you are trying to keep the car somewhat original, this is the way I would (and did) go, as I have an '87 GN myself.
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