most typically it's a bad diode in the alternator, even if it's an after-market rebuilt alternator from your local auto parts store, may have to cowboy up and get one from the dealer
in the master cylinder
The 1991 Volvo brake light relay switch is located beneath the drivers side dashboard. The brake light relay switch will be above the brake pedal.
how do you remove the brake light cover on a 1991 gmc tracker? Do you go from the outside or inside?
on the brake pedal
just above the brake peddle
Possibly defective or misadjusted brake light switch.
You will need to change the brake light switch. The brake light switch can be found below the dashboard on the drivers side.
go to your owners manuel, there is a section in there that will tell you or call your local dealer
The starter on a 1991 Toyota Tercel is located in the front of the engine. It will be located on the left side.
open the trunk, and pull back the carpet and there will be 2 nuts holding the light in place. unscrew them and pull the light out.
Check the brake fluid level in your brake master cylinder in the engine compartment ( the brake light also comes on if the parking / emergency brake is applied )
you need a new brake booster