How do i check brake fluid on a 2006 flstc - 2000 Harley Davidson FLSTC Heritage Softail Classic

There are two.

The front switch is inside the right handlebar switch housing (START, RUN/OFF kill switch, RIGHT TURN SIGNAL) and operates off the front brake lever.
The usual problem with this is it either sticks, or the "tit" that works off the brake lever gets broken off, usually because the front master cylinder wasn\'t installed by the correct procedure.
Usual results is the brake light will not turn off with the ignition on.

The other switch is located along the rear brake hydraulic line.
Start at the master cylinder and follow the line back to the rear caliper, and you\'ll find it eventually.

It appears Harley has a problem with the rear brake light switch on this year, as it tends to spring a leak, brake pedal goes all the way down without stopping, sometimes smoking from the brake fluid being sprayed on hot engine parts, etc.

Hi Anonymous, please visit the websites below and good luck:
Doc Harley Affects on Brake Fluid

Have you checked the level of the brake fluid in the master cylinder fluid reservoir? Do that first. A very low level indicates a leak or worn disk brake pads

did you check to make sure the E-brake is fully retracted?

YOU NEED LARGE C - CLAMP TO COMPRESS PISTON IN CALIPER BORE.REMOVE SMALL AMOUNT BRAKE FLUID FROM BRAKE MASTER CYLINDER RESERVOIR FIRST BEFORE YOU COMPRESS PISTON. AFTER REMOVING A LITTLE BRAKE FLUID.AND COMPRESSING CALIPER PISTON IN BORE.PLACE MASTER CYLINDER RESERVOIR COVER BACK ON.WHEN FINISHING REPLACING BRAKES.PUMP BRAKE PEDAL UNTIL BRAKES FEEL SOLID AND FIRM CHECK BRAKE FLUID LEVEL.DONT DRIVE VECHICLE IF BRAKES DONT FEEL FIRM OR SOLID.

If you know that the bulb inside the brake light is new/good and the light always works with the front brake, then you have a bad hydraulic brake light switch in/on the rear brake line/hose.

Check your brake fluid reservoir if you are low. Other than that, the only parts with fluid are the shocks.

check to make sure brake fluid is full!
and check emergency brake is released the whole way,pull release handle and lift pedal with your foot

check and top off the brake fluid, its low.

brake fluid should be changed every time you change the brake pad. Brake fluid is not the same as hydraulic fluid, which don't contain alcohol, which attract moisture and dirt.
with that say, I don't think too many people really change the brake fluid, not till the brake stop working.