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Under the hood, driver's side attached to the firewall
bad master cylinder
Under the hood. Drivers' side attached to the brake booster on the firewall
turn it counter clock wise
May be the proportioning valve by the master cylinder
you need to take off the master cylinder and the accumulator and replace it with a master cylinder from a non antilock vehicle like a thunderbird or cougar from about 1985 to 1988.
Check your shop manual... I believe the rear brakes are bled using the ignition switch, and the front are bled the traditional way.
If you follow the brake pedal up under the dash, you'll see the switch where the actuator arm from the brake master cylinder attaches to the pedal.
Have you checked the brake fluid level in the master cylinder it may be low causing a light to come on . i did the level is ok.
Most vehicles have master cylinder reservoirs that you can see the fluid through. The side of the reservoir has a high and low fluid mark on it.
You have to remove the Master Cylinder, disconnect the rod that is connected to the brake pedal and remove the bolts holding the Power Booster on. Connect in reverse order.
Eight, one for each cylinder