It can go all the way down to empty, but should never be allowed to get below "add".
The brake light staying on indicates a problem with the brake system, usually low fluid. Check the brake fluid and if it is low, then look for a possible leak in the system or worn brake pads as the fluid had to go down for a reason
Usually it's low brake fluid or a problem with the abs. Check the brake fluid reservoir. Often the brake fluid will go down as the brake pads wear and the calipers has to travel further.
brake fluid level will go down slowly as your disk brake pads wear. Just keep it topped up.
The brake fluid level will gradually go down as the brake pads , brake shoes wear
You may be low on brake fluid. If you are low on brake fluid you may be ready for some brake work or you have a leak somewhere in the system, have it checked soon!
Your brake fluid level is low.
If you pull the parking brake release make sure the pedal is all the way up. After years of wear and tear the spring that pulls the pedal up when it is released can stretch and not fully bring the pedal back up. You may also be low on brake fluid. Your brake system is a closed fluid system. If it is low look for a problem. There is either a line leaking somewhere or the brake pads or shoes are low. When brake pads or shoes wear it causes more fluid to be sent to the calipers or wheel cylinders, causing the fluid to go down in the master cylinder. Adding fluid may cause the light to go off, but IT WILL NOT FIX THE PROBLEM.
There is a smaller master cylinder next to the brake master cylinder. The clutch uses brake fluid also. If you mean where does it go if it is low, the slave cylinder on the transmission is probably leaking.
check your brake fluid it is probably low
I assume you are asking about the brake pedal. Might be due to low/no brake fluid in the reservoir, air in the brake line, possible leak in the brake line, or the master cylinder may not be working properly,
Check your Brake fluid. If the fluid is low then will make the Brake light go on. anothe thing is you might be needing new brakes soon..
Brake fluid level is marginally low, check pad wear rather than just adding fluid.