1994 Buick Roadmaster Owner's Manual - Page 247

Brakes Brake Master Cylinder Your brake master cylinder is here. is filled with It DOT-3 brake fluid, , should have yourbrake system fixed, since leak means a that sooner or later your brakes won't work well,or won't work at all. So, it isn't a good idea "top off" to your brake fluid. Addingbrake fluid won't correct a are leak. If you add fluid when your linings worn, then you'll have too much fluid when you get newbrake linings. You should add (or remove) brake fluid, as necessky, only when work is done on the brake hydraulic system. There are only two reasons why the brake fluid level in your master cylinder might go down. The first is that the brake fluid goes down to an acceptable level during normal brake lining wear. When new liningsare put in, the fluid level goes back up. The other reason is that fluid is leaking outof the brake system. If it is, you Refer to the Maintenance Schedule to determine when to check your brake fluid, See "periodic Maintenance hspections,~ in the Index. 245