on the drivers side located on a junction block in the line going to the rer brakes
at the brake pedal behind or on top
Possibly a defective brake light swith stuck closed.
brake light swith located under the brake pedal is stuck.
Its located on the brake pedal. Unplug the wiring harness and unbolt it and replace it.
Check rear bulbs, rear brake bulb fuse, and check the swith on the brake pedal.
The Master cylinder is under the drivers side floor mat. You need to remove the metal plate to get at it.
try the brake switch on the back of the brake pedal
The 1950 Plymouth P20 had a longer wheel base than the P19. The P19 and P20 were engineering codes for the short and long wheelbase starting in the 1950 model year Plymouth automobiles.
Usually the brake light swith is mounted on the brake pedal arm just under the dash. The switch is depressed when the pedal passes a certain point of travel. Usually there is a plug to unplug off the swith and some sort of mounting device, like a cotter pin, to take off. Hope this helped. Mark
Your brake fuild might be low.
check and see when your brake pedal is not pushed down if it is pushing the brake swith pin back in if so you need to replace the brake light swithch located behind the pedal
Common issue...if the brake light swith is not working; the cruise control will not engage and your brake lights will not go on. replacing switch is easy and inexpensive...its located in the upper part of the brake pedal.