Toyota 4Runner Power Brake Booster

Choosing A Power Brake Booster

A power brake booster helps reduce the effort needed at the brake pedal. Replacements must match the vehicle's brake system, pedal linkage and master-cylinder mounting. The selection includes both vacuum and hydraulic boost designs, which rely on different sources of assistance.

A-Premium offers boosters for selected applications with different connections and mounting arrangements. Compare the parts and connections required for the installed brake system before planning the repair.

Vacuum And Hydraulic Brake Boosters

A vacuum booster uses a pressure difference to assist the driver's pedal effort. Its vacuum source can depend on engine operation or a separate vacuum pump, according to the vehicle's design. Hoses and a check valve are also part of the vacuum supply path.

A hydraulic booster uses pressurized fluid for assistance. On some vehicles it shares a pump and fluid circuit with the power steering system. These designs need the connections and components specified for the installed brake system.

Planning Brake Booster Replacement

A booster works with the pedal linkage and master cylinder, so the pushrod and mounting arrangement must be correct for the application. The service procedure will also specify any work needed on the hydraulic circuit.

Brake service is safety-critical. Use the vehicle's repair procedure and verify the system's operation after the work; a new booster does not correct an unresolved vacuum, fluid or linkage problem.

Frequently Asked Questions (FAQ)