MPA Electrical B3040 Power Brake Booster

Reliable Power Brake Booster Replacement for Nissan and Infiniti

The MPA Electrical Reman Vac Pwr Brake Booster w/o Master Cyl (Part Number B3040) is designed as a standard replacement for select Nissan and Infiniti vehicles. This remanufactured vacuum power brake booster provides consistent braking assistance without including the master cylinder, making it ideal for those seeking a direct fit replacement for their Pathfinder or QX4 models.

• Remanufactured vacuum power brake booster
• Standard replacement grade for reliable performance
• Metal housing for durability and strength
• Diaphragm diameter of 246.63 mm (9.71 inches) for optimal vacuum assistance
• Includes 2 mounting studs with 8 x 1.25 mm master cylinder stud thread size
• Compatible with Nissan Pathfinder and Infiniti QX4 models

About the Reman Vac Pwr Brake Booster w/o Master Cyl Product Line

The Reman Vac Pwr Brake Booster w/o Master Cyl product line from MPA Electrical focuses on remanufactured vacuum brake boosters that do not include the master cylinder. This line is intended for customers who require a reliable booster replacement while retaining their existing master cylinder. The B3040 part number is part of this line, offering a metal housing and standard brake service grade to meet OEM specifications for Nissan and Infiniti vehicles.

Product Details and Specifications

This power brake booster features a vacuum type design with a diaphragm diameter measuring approximately 246.63 mm (9.71 inches), ensuring effective brake pedal assist. The metal housing construction provides durability under typical operating conditions. It includes two mounting studs and a master cylinder stud thread size of 8 x 1.25 mm, which matches the factory specifications for proper fitment. Note that this unit does not include a brake pedal rod extension, master cylinder, gasket, seal, front seal, or mounting bracket, so these components must be sourced separately if needed.

Common Applications and Issues Addressed

• Replacement for failing or weak power brake boosters on Nissan Pathfinder and Infiniti QX4
• Restores proper brake pedal feel and vacuum assist
• Addresses hard brake pedal or increased pedal effort
• Resolves vacuum leaks within the brake booster assembly
• Eliminates inconsistent braking performance due to booster wear

Installation Notes and Tips

Ensure the existing master cylinder is compatible and in good condition before installation, as this booster does not include the master cylinder. Verify the mounting stud locations and thread sizes match your vehicle’s specifications. It is recommended to inspect and replace any related seals or gaskets separately to prevent vacuum leaks. Proper bleeding of the brake system after installation is essential to maintain braking performance and safety.

Quality Assurance and Warranty

This remanufactured power brake booster undergoes thorough inspection and testing to meet standard brake service grade requirements. The metal housing and diaphragm are rebuilt to OEM specifications to ensure durability and reliable operation. Warranty coverage details should be confirmed with the distributor or retailer, as they may vary.