ACDelco 18M1261 Professional Brake Master Cylinder

The ACDelco 18M1261 is a Professional Series brake master cylinder designed to deliver reliable hydraulic pressure for your vehicle's braking system. As the heart of the hydraulic brake circuit, this master cylinder converts mechanical force from the brake pedal into hydraulic pressure, distributing it to the front and rear brake assemblies for consistent, safe stopping performance.

Key Features:

• ACDelco Professional Series quality — engineered to meet or exceed OEM specifications
• Precision-machined aluminum or cast iron bore for consistent hydraulic pressure output
• Pre-filled and pre-bled reservoir design for easier installation on compatible applications
• Corrosion-resistant internal components for long service life
• Dual-circuit design for added safety — maintains partial braking if one circuit fails
• Includes reservoir and cap assembly where applicable

ACDelco Professional brake components are manufactured to strict quality standards, making the 18M1261 a trusted choice for brake system maintenance and repair. This master cylinder is a direct-fit replacement that helps restore proper pedal feel and braking confidence.