How to replace a power brake booster on Acura MDX?

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Accepted Answer

Depress the brake pedal several times with the engine off and make sure that there is no change in the pedal reserve distance. Depress the pedal and start the engine. If the pedal goes down slightly, operation is normal. Start the engine and turn it off after one or two minutes. Depress the brake pedal several times slowly. If the pedal goes down farther the first time but gradually rises after the second or third depression, the booster is airtight. Depress the brake pedal while the engine is running, then stop the engine with the pedal depressed. If there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight. Disassembly of the power unit requires special tools and is not ordinarily performed by the home mechanic. If a problem develops, it's recommended that a new or factory rebuilt unit be installed. Remove the master cylinder. On 2004 and earlier Honda models and 2001 and 2002 Acura models, disconnect the accelerator cable and cruise control cable from the throttle body. Disconnect the large vacuum hose from the power brake booster. In the passenger compartment, remove the joint pin and then disconnect the pushrod clevis from the brake pedal arm. Remove the nuts attaching the booster to the firewall. Carefully lift the booster unit away from the firewall and out of the engine compartment, being especially careful not to bend the hydraulic brake lines that are in front of the booster. To install the booster, place it into position and tighten the retaining nuts. Connect the pushrod to the brake pedal. The manufacturer states to use a new lock pin for the pushrod joint pin when installing the brake booster. Install the master cylinder. Reconnect the vacuum hose. Bleed the brakes. Carefully test the operation of the brakes before placing the vehicle in normal service. The pushrod length on these models must be adjusted for proper installation of the brake booster. Special tools are required for this procedure. It is recommended that the vehicle be towed to a dealer service department or other qualified repair shop for replacement of the power brake booster.

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