how do i check the brakes the light does not work already changed the light bulb on 1998 BMW 328i

is there a sensor that needs to be changed or fuse?

Asked by for the 1998 BMW 328i
Do you mean the hydraulic system of the brakes, the brake linings or the actual brake lights or brake warning light. Fuse #46 (16 amp)protects the brake light circuit, one of the wires at the brake light switch (at the pedal) should have 12 volts in the key on or running position, blue/red wire at the switch should have power when the pedal is pressed if the switch is good and brings power all the way back to the rear brake light bulbs. Low brake fluid or worn brake pads will complete a circuit illuminating the brake pad low or brake fluid low warning light. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
You are Awesome Patrick! Thanks for the website, it is a good one!