Mercury 6L8Z-2002-A Kit - Brake Booster Repair

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To remove the brake booster, follow these steps:1. In the engine compartment, remove the nuts attaching the master cylinder to the booster and carefully pull the master cylinder forward to clear the mounting studs, being cautious not to damage the brake lines.2. Disconnect the vacuum hose from the power brake booster.3. In the passenger compartment, detach the pushrod from the top of the brake pedal, ensuring to discard and replace the clevis locking pin on 2008 and later models.4. Remove the nuts attaching the booster to the firewall.5. Lift the booster unit away from the firewall and out of the engine compartment.

The airtightness check for the brake booster includes the following steps: 1. Start the engine and turn it off after a minute or two. 2. Slowly depress the brake pedal multiple times, observing if the pedal goes down further the first time but gradually rises after subsequent depressions, indicating an airtight booster. 3. Depress the brake pedal while the engine is running and stop the engine with the pedal depressed, checking for no change in pedal reserve travel after holding for 30 seconds, indicating an airtight booster.