with tools
change the brake lights check the fuse check the brake light swtch
unbolt master cylinder from boosterdisconnect pushrod at brake pedal arm under dashdisconnect vacuum hose from boosterunbolt booster from firewallreverse order to install new booster
easy
To replace the brake booster on a 2000 Pontiac Grand Prix, first, disconnect the negative battery cable to ensure safety. Remove the vacuum line and any electrical connections to the booster. Then, unbolt the master cylinder from the brake booster and set it aside, followed by removing the bolts securing the brake booster to the firewall. Finally, replace it with the new booster, reassemble the components, and bleed the brake system to ensure proper functionality.
DOT 3
The Grand Marquis has shocks, not struts. They are simple bolt on parts.
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
how to change a valve cover gasket on a 97 mercury grand marquis ?
Check the brake light switch ,on the brake pedal. Might need adjusting.
Your Brake Lights. It's mounted on the Steering Column and is very easy to change. Around $10 at your local parts store.
Could be the tires, or your front brake rotors