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GM GENUINE 1771158  
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GM Genuine parts may ship in a GM Genuine or AcDelco box. The product will fit and function the same.
GM GENUINE 1771158 Specifications
ABS Sensor Ring IncludedNo
Bolt Circle Diameter (IN)4.72
Bolt Circle Diameter (MM)120
Bolt Hole Quantity5
Center Bore Diameter (IN)2.6
Center Bore Diameter (MM)67.4
ConstructionFull Cast
Disc FinishTurned
Discard Thickness (IN)1.062
Discard Thickness (MM)27
Hat FinishPainted
Lug Quantity5
MaterialCast Iron
Nominal Thickness (IN)1.18
Nominal Thickness (MM)30
Outside Diameter (IN)12.6
Outside Diameter (MM)321
Rust Resistant CoatingYes
Solid Or Vented Type RotorVented
Surface TypeSmooth
GM Genuine Brake Rotors deliver the performance, durability, and service life you expect from General Motors.

Features & Benefits:
  • Made with Ferritic Nitro-Carburizing technology are hardened and strengthened during an extended manufacturing process
  • The cast iron rotor surface is bonded with nitrogen atoms under the intense heat of a giant, 1,040-degree oven. The additional atom layer provides an extra defensive barrier against the corrosive threat of water, salt, and even acid rain.
  • Inspected for balance, helping with smooth brake operation and noise level
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
Installation Tips
  • Always replace Brake Pads and inspect Calipers and Brake Hoses when installing new rotors
  • Suspend the caliper from the suspension using a Caliper Hanger to prevent damage to the brake hose
  • After removing the old rotor, clean the hub face with a Wire Brush to remove rust buildup and apply Copper Anti Seize to prevent future buildup. Rust or debris on the hub can cause rotor runout and lead to wheel vibration
  • Apply Brake Lube to caliper pins, clips, the edges of the brake pad mounting tabs, and the back side of the brake pads to ensure noise free braking. DO NOT apply lube to the friction side of the brake pads
  • Use a Caliper Piston Compressor to retract the caliper piston(s) and make room for the new, thicker brake pads
  • Open the master cylinder reservoir during piston compression to prevent pressure buildup. Keep an eye on the Brake Fluid level to ensure it does not overflow
  • After the job is complete, pump the brake pedal several times to push the caliper piston back up against the pads to ensure proper brake function

OEM / Interchange Numbers: 13578074

Warranty Information:
24 Month / Unlimited Mile Warranty