With an ohmeter or a self-powered test light. Hook the two leads of your tester to the terminals on the brake light switch. Push down on the brake pedal and if the light stays off or the meter stays at infinity, the switch is bad.
On the brake pedal arm.
Check the brake light fuse. If you have 12 volts at the brake light switch I would suspect the signal light switch is at fault.
Stop light switch? Most are located at the upper end of the brake pedal under dash area
It is mounted on a bracket under the dash at the brake pedal. From there it is self explanatory.
Usually on the upper end of the brake pedal under dash area
Check bulbs Fuse Stop light switch
Top of the brake pedal.
This happened to my 1985 Lebaron Conv and all the car needs is a new brake light switch mounted on the brake pedal under the dash. Problem solved!
Remove the retaining ring at the top of your 1985 Chevy ignition switch. Slide the ignition switch out and remove the wiring harness. Reverse the process to install the new ignition switch.
Check the sensor in the brake reservoir give the float a wiggle. Use a multimeter if necessary if constant low reding is given the switch /sensor is no good.
1985
The 1985 Chevrolet El Camino ignition switch can be removed by loosening the retaining ring at the top of the switch. The switch will slide out. Remove the wiring harness from the back of the ignition switch.