Parking brake light, the 3 yellow 4WD lights come on but no codes are generated

[Jeffm65]

My 2006 4Runner, 6 cylinder, TR5, 4WD has been showing the red parking brake light on the left and the 3 yellow 4WD lights on the right have been coming on.
What I’ve noticed they come on when the engine and or the outside air is somewhat cold. When the temperatures change and things warm up the lights go out.
I checked for codes being flagged and there are none. I replaced the parking brake switch as suggested and that didn’t make a difference. I replaced the gas cap twice, still lighting up.
It seems to be outside or engine temperature related but don’t know which. The engine temperature is fine.
Any thoughts or ideas besides a sledge hammer would be much appreciated! I love this thing!!!
Jeff

 

[Jeffm65]

Issues fixed

I fixed my issues finally. They lights all came on because the brake reservoir was close to empty. $10 later and everything is fine!:doh:

 

[AuSeeker]

I fixed my issues finally. They lights all came on because the brake reservoir was close to empty. $10 later and everything is fine!:doh:

If your reservoir was very low like you say you need to check for leaks!!

Brake fluid doesn't evaporate the fluid has to be going somewhere, it either a leak or your brake pads are completely worn out and need replacing, as the pads wear out the pistons in the calipers move out and there's more fluid in the calipers and less in the reservoir.