Broken brake line - 2002 Oldsmobile Alero

Two reasons for the brake light to be on. 1) Parking brake and 2) problem with pressure in the brake lines.
If the parking brake is off and the ignition is on but the brake light stays on, then there's a problem with the switch attached to the parking brake. It might be stuck or broken.
If the brake light goes on when you apply the brakes, there is an imbalance somewhere in the brake lines between front and back wheels. This light usually goes out when your foot is off the brake, but if it stays on, the switch in the brake lines near the master cylinder might be stuck or broken.

it is a brake problem that needs to be repaired before driving it. Based on what you describe the caliper piston seal has failed, or a broken/cracked brake line. Repairs would be cheaper than an accident, with possible injuries and lawsuits.

if this has anti-lock brakes it may be the HCU(hydraulic control unit) may have air in it. it may have to be activated to get all the air out.

You have a broken brake line somewhere on the truck. and if not a broken line then you need to bleed the whole brake system. Hope this helps.

POSSIBLE AIR IN THE LINES
POSSIBLE BROKEN BRAKE LINES OR LINE
BRAKE PADS COULD BE WORN TO METAL
EMERGENCY BRAKE LEVER OR PETAL OUT OF ADJUSTMENT

Look at the differential housing and you'll find a "T" with a flexible line going to that broken line above the tank. Cut and connect another a replacement line from front of tank around to the "T" and then bleed the rear brakes. The single line feeds both rear brakes from that "T" and there are no other lines connected to it. Done this way will keep you from having to drop the fuel tank to get to the line to replace it.

You would have to replace the entire brake line from the front to the rear by disconnecting the entire line inch by inch until it is free from the vehicles body. Replace this and don't go for remedies as this is the braking system of the car, everything relies on this.

beg borrow or steal a pressure bleeder, start with right rear, lest rear, right front then lef front,

rusted or broken? if its broken thats a design flaw. you should be able to route new line without dropping fuel tank.

air in the brake lines have you done any repairs to it //possible broken line///if you have changed anything in the brake line system you need to bleed brakes or readusting brake linings if you replaced them,,,hope it s of some help//oz