More Information for ACDELCO 18M1878
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ACDELCO 18M1878  
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ACDELCO 18M1878 Specifications
Bleeder Hoses IncludedYes
Brake Booster IncludedNo
Master Cylinder Bore Diameter (MM)1.125
Master Cylinder Cap IncludedYes
Master Cylinder MaterialCast-Iron
Mounting Bracket IncludedNo
Mounting Hole Quantity2
New Or RemanufacturedNew
Port Quantity2
Primary Outlet Thread Diameter (IN)0.5
Pushrod IncludedNo
Reservoir IncludedYes
Secondary Outlet Thread Diameter (IN)0.5625
Gold / Professional
ACDelco Professional Brake Master Cylinders use both aluminum and iron castings, making them the high quality replacements.

Features & Benefits:
  • Contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage
  • Ready to bench bleed and install right out of the box - no assembly required
  • Manufactured to meet OE specifications of fit, form, and function
Master Cylinder 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)

Warranty Information:
24 Month / Unlimited Mile Warranty
Warranty Details