If you mean the " BRAKE " light in your dash , that means your brake fluid level in the brake master cylinder is LOW . The brake master cylinder is located in the engine compartment on the drivers side
There are typically two indicators of a faulty master cylinder: 1. you press on the pedal and it goes straight to the floor. If you have fluid, you're not leaking at the wheel cylinders and you have bled the air from the line... it's a master cylinder. 2. You press on the pedal, have some brakes then the pedal fades to the floor. In either case, it's the master cylinder. Of course, if it's leaking or sucking air and sending up bubbles into the reservoir when a friend presses the pedal... that too. Every time you press the pedal there should be a little "swirl" of brake fluid in the reservoir, but there should never be bubbles.
Start the engine. Place you foot on the brake pedal, and press fairly hard and hold the pedal down. If the pedal very slowly, moves toward the floor any at all, the master cylinder is defective. Replace it immediately!!!!!
There are two normal causes. The clutch is worn out or there is a leak in the hydraulic clutch slave or master cylinder. To check the clutch, press the clutch slave cylinder down. If the clutch slave cylinder bellows compresses down to the slave cylinder, the clutch is worn out. Check the clutch master cylinder fluid level. if this is low, then the clutch cylinder need to be checked. To check for a hydraulic leak in the clutch slave cylinder, remove the cylinder's bellows and check for any fluid. If fluid is present, rebuild or replace the cylinder and bleed the system. To check the clutch master cylinder, check the back the of clutch master cylinder for leaks. If fluid is present, replace or rebuild clutch master cylinder and bleed the system. In my experience, hydraulic leaks occur at the clutch slave cylinder.
The brake master cylinder is what pushes brake fluid to each wheel when you press on the brake pedal. If it's bad or marginal, your braking will suffer or disappear entirely! This is something that you need to address right away! FriPilot
Make sure your clutch master cylinder(BRAKE FLUID DOT 3)is full,have someone press clutch pedal to floor and hold,open slave cylinder bleeder screw,watch for air to come out,continue this until no air is seen coming out.You can use a clear hose on bleeder screw so you can see better and have other end in glass containerwith cluch fluid,make sure your clutch master cylinder has plenty of fluid or air will get back in.Your slave cylinder is bolted onto your transmission with 2 bolts and it is by the opening of transmission,if slave cylinder is leaking,then replace and bleed.
When you press and hold the brake pedal it will slowly move to the floor. It can also have a catastrophic failure and go straight to the floor with no stopping ability at all. If you hold the brake pedal down and it slowly moves to the floor any at all, replace the master cylinder.
Start at the master cylinder. Make sure it's full, pull one of the brake lines, have someone press on the pedal and hold your finger over the hole to see if you get pressure. If you don't replace the master cylinder. If you do, reconnect that brake line and try the other. If you have pressure in both lines of the master cylinder, continue on down to the individual wheel cylinders.
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Slave cylinders will typically leak when they're bad. If you're sucking air (getting air in the lines) or the brakes just don't engage when you press the pedal or if the brake pedal fades to the floor; it's a master cylinder.