The brake fluid reservoir on a 1978 Pontiac Trans Am is typically located
under the hood, near the master cylinder. The master cylinder is the main component of the braking system, and the reservoir is a small, usually clear or translucent, container attached to it. It will have markings indicating the minimum and maximum fill levels. Look for a cap that says "Brake Fluid" or has a brake system symbol on it.
Caution: Brake fluid is corrosive and can damage paint. If you spill any, clean it up immediately. Also, ensure you're using the correct type of brake fluid as specified in your owner's manual (DOT 3 is common but check to be sure).
