Brake Lights Staying On

Posted by Packard 1948 On 2016/5/4 11:32:52

My dad reported that the brake lights are staying on. I replaced the brake light switch and test drove the car and not trouble and he just reported that the brake lights are staying on again.

Perhaps if the brake lines heat up and the fluid expands the switch could close. I told him to test it and drive the car and when he stops see if the brake lights are on then wait 30 minutes and if the lights go out that defined the problem as being fluid expansion and not wires.

I checked the fluid cap and it vents correctly so that is not it. Sadly the master cylinder and brake plumbing was not one of the items I addressed during the Pampered Packard Spa and Wellness Center visit last summer...I knew I should have dug deeper...

The only thing I can think of is that I used DOT 5 silicone brake fluid but that should not be an issue as silicone does not attack any rubber or metal and it should not expand any more than DOT 3 fluid does.

Are there any nuggets of troubleshooting advice from the wise old Packard owls that dwell behind my keyboard?!?!?

THANKS!!!