ACDelco GM Original Equipment Rear Disc Brake Rotor
OE
Pack of 1

ACDelco GM Original Equipment Rear Disc Brake Rotor

GM Part #88964176

ACDelco Part #177-0920

MSRP$103.96*

ACDelco GM Original Equipment Disc Brake Rotors are designed, engineered, and tested to rigorous standards, and are backed by General Motors.

  • Proper rotor function supports the entire hydraulic braking system
  • Delivers quiet and reliable deceleration for everyday driving
  • Friction surfaces give brake pads a solid place to grip

Pack of 1

About this product

ACDelco GM Original Equipment Disc Brake Rotors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These disc brake rotors mount to the wheel hub and give the brake pads a stable, true surface to clamp against, helping restore smooth, quiet deceleration and predictable stopping power in daily commuting or repeated heavy stops. Its baked-on coating helps prevent brake pulsation, helps prevent the rotor from seizing to the hub, and provides superior rust prevention against harsh elements, while the non-directional ground finish extends brake pad life and minimizes thickness variation for consistent braking. Built with multiple alloys to improve heat dissipation and performance and mill-balanced for proper rotor function, it's validated for proper metallurgy and plate thickness to support reliable braking under real-world thermal stress. ACDelco GM Original Equipment parts are the true OE parts installed during the production or validated by General Motors for GM vehicles.

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  • Proper rotor function supports the entire hydraulic braking system
  • Delivers quiet and reliable deceleration for everyday driving
  • Friction surfaces give brake pads a solid place to grip
  • Maintains consistent braking performance without steering wheel vibrations
  • Ensures smooth and predictable stopping power on the road
  • Dissipates heat generated during the vehicle deceleration process
  • GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type
  • GM regularly updates production and service part designs to integrate new materials and technologies

ConstructionFull Cast
MaterialCast Iron
Surface TypeSmooth
ABS Sensor Ring IncludedNo
Rust Resistant CoatingYes
Outside Diameter11.8 in / 299.72 mm
Discard Thickness0.413 in / 10.49 mm
Nominal Thickness0.472 in / 11.99 mm
Center Hole Diameter70.7mm
ClassificationOE
Solid Or Vented Type RotorVented
Hat FinishCoated
Disc FinishGround
Overall Height1.4 in / 35.56 mm
Mounting Bolt Hole Circle Diameter4.5mm

24 Months/Unlimited Miles Limited Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

The following should be conducted by a qualified technician:

  • Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
  • Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
  • Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
  • Check the thickness of your brake pads.
  • Inspection of the brake hoses for brittleness or cracking.
  • Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
  • Inspection of wheel bearings and grease seals.
  • Parking brake adjustments (as needed).

Troubleshooting Tips:

  • Vehicle pulls to the left or right when brakes are applied.
  • Visible ridges or deep grooves on the rotor surface.

ModelBody StyleTrimYear(s)
Terraza2005