ATE 300123 Power Brake Booster

ATE Original Vacuum Brake Booster

The ATE Original Brake Booster, Vacuum is a direct-fit power brake booster built for consistent pedal assist and reliable braking response. It is engineered for BMW applications that need stable vacuum-assisted braking at low pedal effort, including BMW Z4, 325Ci, 330Ci, 325i, 325xi, 330i, 330xi, 323Ci, 323i, 328Ci, and 328i models.

Part number 300123 is part of the ATE Original line, which focuses on OE-style replacement components with the same quality standards used in original equipment applications. For BMW brake booster replacement, this line supports a straightforward service process and consistent fitment.

Key Features

• Vacuum booster type for power-assisted braking
• Single-diaphragm design
• 10-inch housing diameter
• Metal housing for durable construction
• Brake pedal rod extension included
• Master cylinder not included
• Mounting hardware not included
• Mounting bracket not included

Detailed Description

ATE brake booster part number 300123 is a vacuum-operated power brake booster designed to restore proper pedal assist in BMW braking systems. The metal housing, single diaphragm layout, and integrated pedal rod extension support a precise replacement for vehicles that rely on vacuum assist for normal stopping performance. This unit is built for BMW Z4 and 3 Series applications where consistent brake feel and dependable response matter in daily driving, stop-and-go traffic, and emergency braking situations.

This part cross-references PSA366 for the same application. The ATE Original product line is positioned for OE-level replacement needs, making this booster a practical choice when replacing a worn or failing brake booster on BMW 325Ci, 330Ci, 325i, 325xi, 330i, 330xi, 323Ci, 323i, 328Ci, or 328i models.

What It Helps Address

• Hard brake pedal feel
• Reduced brake assist from vacuum loss
• Inconsistent stopping response
• Brake booster diaphragm wear
• Pedal effort that increases during braking

Installation Notes and Tips

Verify the vehicle’s brake booster configuration, housing diameter, and pedal rod setup before installation. This unit includes the brake pedal rod extension, but does not include the master cylinder, mounting hardware, or mounting bracket. Inspect the vacuum supply, check valve, and related brake system components during replacement to confirm proper operation after installation.

Quality Assurance

ATE Original brake boosters are built with high-quality materials, careful workmanship, and a design focused on reducing premature wear. Part number 300123 is intended for BMW brake booster replacement where OE-style fit and dependable vacuum assist are required.

• Fits 2003-2008 BMW Z4, N/A
• Fits 2001-2006 BMW 325Ci, N/A
• Fits 2001-2006 BMW 330Ci, N/A
• Fits 2001-2005 BMW 325i, N/A
• Fits 2001-2005 BMW 325xi, N/A
• Fits 2001-2005 BMW 330i, N/A
• Fits 2001-2005 BMW 330xi, N/A
• Fits 2000 BMW 323Ci, N/A
• Fits 1999-2000 BMW 323i, N/A
• Fits 2000 BMW 328Ci, N/A
• Fits 1999-2000 BMW 328i, N/A