How a brake light circuit operates the brake lights when the brake pedal is pressed?
The most common brake light switch is the simple mechanical type mounted close to the brake pedal arm. When the pedal is depressed, the switch automatically closes to turn on the brake lights. The other type of switch works hydraulically and is operated by the pressure of fluid in the pipes when the brake is applied.
Why are the brakes not applying when you push the pedal?
There will be a little free play in the linkages to the master cylinder/ brake fluid compressing in the brake lines so the brakes will not be applying until you push the pedal further any way. It reduces the risk of your brake lights flickering while driving if pedal is bumped. But I am not a mechanic.
Do you turn brake lights on or off?
Turn the key in the ignition to the ‘On’ state, so the car’s electricals power up. There is no need to start the car for this. In fact, the brake lights might be receiving power regardless of whether the car is on or off, so this step may not apply. Use a torch (a head-mounted lamp works great here) to see the business end of the brake pedal.
Why does my dash light come on when I step on the brake?
I suspect that you have a broken wire in the trunk that will cause this = bad ground. There is a connector in the rear wiring harness near the rear seat that gets corroded that will cause this too. Clean the connections there on both sides of the connector then put electrolitic grease in there to help prevent corrosion.
Is there a way to change the switch on a pedal?
Modify the switch. This can be done in 2 ways – shave down the top of the button head so the plunger is further out, or open it up and clean/move/change the contacts. The third option is to modify the pedal or mounting. You may be able to bend the tab that hit the button’s plunger, or the bracket the switch sits in. Sound advice here.