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check the brake light switch on the brake pedal
leaking wheel cylinder
The lines run from the master cylinder to the calipers and wheel cylinders.
Dot 3Dot 3
Master cylinder should be at the driver's side firewall
check and/or replace brake pedal switch.
brake light switch is mounted by the brake pedel remove lower panel above brake pedel and then you will see the switch should be able to turn the switch to replace
Bulb is probably defective. Replace it.
on the brake pedal bracket there is an acuator it may be adjustable or you may need to replace it
More than likely the ratchet mechanism that causes the brake pedal to lock down is broken, perhaps due to a broken or disconnected spring. The "weird sound" could be the remainder of the mechanism brushing against the teeth where it would normally lock.
A fifth drum brake assembly was added to the car, placed on the driveshaft. This was the emergency brake, so the car no longer relied on the rear brake assemblies if there was a brake failure. This invention was by a person not working for Chrysler, and was the result of a contest to identify a new safety feature. This 5th brake was added to other Chrysler cars as well, but did not survive for long and it was abandoned by 1963.