Here's a general overview of the process. This is NOT a substitute for a repair manual. Variations may exist depending on your exact model and engine.
1. Safety First:
* Disconnect the negative battery terminal. This prevents accidental short circuits.
* Block the rear wheels. This is crucial to prevent the car from rolling.
* Raise the vehicle securely using jack stands under the frame rails, not the jack itself. Never work under a vehicle supported only by a jack.
2. Component Removal:
* Master Cylinder: You may need to remove or at least partially loosen the master cylinder to gain access to the brake booster. This often involves disconnecting brake lines – be prepared to catch any residual brake fluid. Use a clean container to collect brake fluid and properly dispose of it.
* Vacuum Hose: Disconnect the vacuum hose connecting the booster to the intake manifold.
* Push Rod: Disconnect the push rod connecting the booster to the master cylinder. This may involve removing a retaining clip or bolt.
* Nuts and Bolts: The brake booster is held in place by several nuts and bolts. These are usually located at the firewall. Carefully remove them.
* Removing the Booster: Carefully maneuver the booster out of the engine compartment. It might be tight, and you may need to use some gentle persuasion.
3. Installation:
* Install new booster: Position the new brake booster in place, making sure all the mounting points are properly aligned.
* Tighten nuts and bolts: Secure the booster with the nuts and bolts you removed earlier. Torque them to the specifications in your repair manual.
* Reconnect push rod: Connect the push rod to the master cylinder.
* Reconnect vacuum hose: Connect the vacuum hose to the intake manifold.
* Reconnect Master Cylinder (if removed): If you removed the master cylinder, carefully reconnect it and all its brake lines, ensuring no leaks. Bleed the brakes thoroughly afterwards.
* Bleed the Brakes: This is crucial to remove any air introduced during the repair. This typically involves opening each brake bleeder valve and pumping the brake pedal until firm pressure is achieved. You'll likely need a helper for this step.
4. Final Checks:
* Lower the vehicle: Carefully lower the vehicle to the ground.
* Check for leaks: Carefully inspect all connections for leaks.
* Test the brakes: Test the brakes thoroughly. They should feel firm and responsive.
Important Considerations:
* Brake Fluid: You will likely need new brake fluid. Use DOT 3 or DOT 4 brake fluid, as specified in your owner's manual.
* Tools: You'll need a variety of tools, including wrenches, sockets, screwdrivers, a brake bleeder kit, and potentially a breaker bar for stubborn bolts.
* Professional Help: If you're not comfortable with this repair, it's best to take your vehicle to a qualified mechanic. Brake system repairs are critical for safety.
Remember: This is a general overview. Consult a repair manual for your specific vehicle model before attempting this repair. Improper installation can lead to serious injury or death.
