Mercury 7W7Z-2005-A Booster Assembly - Brake

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To check the power booster, start by depressing the brake pedal multiple times with the engine off and ensuring no change in the pedal reserve distance. Then, depress the pedal and start the engine; if the pedal goes down slightly, it is normal. If it remains airtight when the engine is turned off and the pedal is held down for about 30 seconds, it is considered airtight. A "hard" pedal feel with the engine running suggests booster problems or vacuum hose leaks.

To install the power brake booster unit, place the booster on the firewall, tighten the mounting nuts, reconnect the pushrod and brake light switch to the brake pedal, install the retaining clip, and attach the master cylinder to the booster, tightening the nuts. Adjustment may be necessary for some boosters with adjustable pushrods.