Lincoln XW7Z-2005-AA Brake Booster Assembly

First of all, the power brake booster unit does not require any special maintenance. The vacuum hose and case should be inspected from time to time. If necessary, a new or factory-rebuilt unit should be installed. To check the booster, the brake pedal must be depressed a number of times without starting the engine. After starting the engine, check for any changes in pedal reserve distance. A "hard" pedal feel indicates booster problems or vacuum hose leaks. Removing involves detaching the master cylinder, vacuum hose, electrical connector and push rod retaining clip. Finally, remove the nuts attaching the booster to the firewall and lift it out. For installation purposes, put the booster on the firewall, tighten the nuts then reconnect push-rod and brake light switch before attaching the master cylinder back on it. Adjusting pushrod length may be necessary in some cases.

Vacuum-operated boosters require periodic inspection of the vacuum hose and case for maintenance. Dismantling and repair should be done by a professional. To check the power booster, depress the brake pedal multiple times with the engine off and ensure there is no change in the pedal reserve distance. Start the engine and depress the pedal, if it goes down slightly, it is operating normally. Depress the pedal with the engine off and if it goes down farther the first time but gradually rises after subsequent depressions, the booster is airtight. If the pedal feels "hard" when the engine is running, there may be an issue with the booster or a vacuum leak. To remove the booster, detach the master cylinder, vacuum hose, brake light switch, and nuts attaching it to the firewall. Installation involves placing the booster on the firewall, connecting the pushrod and brake light switch, and tightening the mounting nuts. Adjustment may be necessary if the pushrod is misadjusted, and a gauge can be used to check the pushrod length. Hydraulically operated boosters require checking the fluid levels, power steering pump belt tension, and inspecting hoses for leaks and restrictions. Perform a functional test of the Hydro-Boost system to check for proper operation. If the Hydro-Boost unit is suspect, it should be tested by a professional and replaced if necessary. To remove the Hydro-Boost unit, discharge the accumulator, remove the master cylinder and hydraulic lines, disconnect the pushrod from the brake pedal assembly, and remove the unit from the firewall. Installation involves placing the Hydro-Boost assembly on the firewall, connecting the pushrod to the brake pedal assembly, and securing the locknuts. Install the master cylinder, connect the fluid pressure, steering gear, and return hoses, and check for leaks. Bleed the power steering system if necessary.

First of all, the power brake booster unit does not require any special maintenance. The vacuum hose and case should be inspected from time to time. If necessary, a new or factory-rebuilt unit should be installed. To check the booster, the brake pedal must be depressed a number of times without starting the engine. After starting the engine, check for any changes in pedal reserve distance. A "hard" pedal feel indicates booster problems or vacuum hose leaks. Removing involves detaching the master cylinder, vacuum hose, electrical connector and push rod retaining clip. Finally, remove the nuts attaching the booster to the firewall and lift it out. For installation purposes, put the booster on the firewall, tighten the nuts then reconnect push-rod and brake light switch before attaching the master cylinder back on it. Adjusting pushrod length may be necessary in some cases.