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ACDelco GM Original Equipment Brake Master Cylinder is a hydraulic pump mounted to the brake booster and contains a reservoir that holds brake fluid. This original equipment brake master cylinder has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Signs of Wear:

  • Spongy or mushy braking
  • Brake fluid leaks
  • Slower stop-times
  • Lower than normal brake fluid levels or needing to replace brake fluid more frequently
  • Brakes locking simultaneously
  • Contaminated Brake Fluid (due to leaking seals)
Bleeder Hoses IncludedYes
Port Quantity2
Master Cylinder Bore Diameter1.4173228346
Secondary Outlet Thread Diameter0.5
Master Cylinder MaterialAluminum
Master Cylinder Cap IncludedYes
Brake Booster IncludedNo
Mounting Bracket IncludedNo
Mounting Hole Quantity2
Pushrod IncludedNo
Primary Outlet Thread Diameter0.5625
Reservoir IncludedYes
Alternate/OEM Part Number(s): 18030607, 18M365, 19176353

Warranty Information:
24 Month / Unlimited Mile Warranty on parts sold on or after 04/01/18; 12 Months on parts sold before 04/01/18.
Warranty Details