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          ACDelco 18A489AC - Disc Brake Rotor (Front)

          MPN: 18A489AC
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $55.95
          Out of stock
            • Newparts SKU
              1744918
            • Weight
              21.2 lbs
            • Dimensions (L x W x H)
              13.5 x 3.1 x 12.9 in
            • Manufacturer Part #
              18A489AC
          • Brand
            ACDelco
          • Position
            Front
          • Manufacturer
            ACDelco
          • MPN
            18A489AC
          • Features
            ABS Tone Ring Included : No
            ABS Tone Ring Included : No
            Bearings Included : No
            Bolt Circle Diameter (in) : 6.5
            Bolt Circle Diameter (mm) : 165.1
            Bolt Hole Quantity : 8
            Bolt Hole Quantity : 8
            Center Bore Diameter (in) : 5.4in
            Center Bore Diameter (mm) : 137.2mm
            Center Hole Diameter : 137.15
            Center Hole Diameter : 5.4
            Construction : Full Cast
            Construction : Full Cast
            Conventional Or Drum-In-Hat Type Rotor : Conventional
            Directional or Non-Directional Brake Surface : No
            Disc Finish : Non Directional
            Disc Finish : Non Directional
            Discard Thickness : 1.210
            Discard Thickness : 1.215
            Discard Thickness : 30.85
            FAQ - Answer 1 : Yes, ACDelco also offers GM OE brake rotors and Professional brake rotors.
            FAQ - Question 1 : Does ACDelco offer other grades of brake rotors?
            Features & Benefits - Bullet 1 : Manufactured with multiple alloys for improved heat dissipation and performance
            Features & Benefits - Bullet 2 : Mill-balanced for proper rotor function; no extra weights needed
            Features & Benefits - Bullet 3 : Quality validated for proper metallurgy and correct brake plate thickness
            Features & Benefits - Bullet 4 : Rounded radius for added strength
            Grade Type : Regular
            Grade Type : Regular
            Hat Finish : Plain
            Hat Finish : Plain
            Height (in) : 2.8
            Height (mm) : 71.1
            Height : 2.8
            Length (in) : 13.5
            Material : Cast Iron
            Material : Cast Iron
            Mounting Bolt Hole Circle Diameter : 165.1
            Mounting Bolt Hole Circle Diameter : 6.5
            Mounting Bolt Hole Diameter : 0.64
            Mounting Bolt Hole Diameter : 16.25
            Mounting Bolt Hole Quantity : 8
            Nominal Thickness : 1.285
            Nominal Thickness : 1.300
            Nominal Thickness : 32.65
            Outside Diameter : 12.5
            Outside Diameter : 12.5
            Outside Diameter : 317.5
            Overall Height : 2.755
            Overall Height : 70
            Product Description : ACDelco Advantage Coated Disc Brake Rotors provide reliable vehicle braking power. Their robotic-applied, baked-on coating helps prevent brake pulsation, helps prevent the rotor from seizing to the hub, and provides superior rust prevention against harsh environmental elements such as rain, snow, and corrosive road sprays. They feature a non-directional ground finish that helps to extend brake pad life and minimizes thickness variation. They are also ready to be installed right out of the box, with no machining required. These dependable aftermarket Advantage Coated Disc Brake Rotors offer quality at an economical price. âš  WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov
            Programming Required : No
            Rust Resistant Coating : Yes
            Rust Resistant Coating : Yes
            Signs of Wear & Troubleshooting - Section 1 - Bullet 4 : Vehicle pulls to the left or right when brakes are applied.
            Signs of Wear & Troubleshooting - Section 1 - Bullet 5 : Visible ridges or deep grooves on the rotor surface.
            Slotted : No
            Slotted : No
            Solid Or Vented Type Rotor : Vented
            Solid Or Vented Type Rotor : Vented
            Stud/Lug Hole Quantity : 8
            Surface Type : SMOOTH
            Surface Type : Smooth
            Weight (lb) : 21.2
            Width (in) : 3.1
          • Part Type
            Disc Brake Rotor
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          1988ChevroletK3500Cheyenne (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Cheyenne (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Cheyenne (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Scottsdale (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Scottsdale (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Scottsdale (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Silverado (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Silverado (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1988ChevroletK3500Silverado (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Cheyenne (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Cheyenne (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Cheyenne (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Scottsdale (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Scottsdale (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Scottsdale (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Silverado (6.2 V8 DIESEL)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Silverado (7.4 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1989ChevroletK3500Silverado (5.7 V8 GAS)Wheelbase: 131.5, Wheelbase: 155.5
          1999ChevroletTahoeBase (6.5 V8 DIESEL)
          1999ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1999ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1999ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1999ChevroletK2500 SuburbanLS (5.7 V8 GAS)Notes: 8600lb GVW
          1999ChevroletK2500 SuburbanLS (6.5 V8 DIESEL)Notes: 8600lb GVW
          1999ChevroletK2500 SuburbanLS (7.4 V8 GAS)Notes: 8600lb GVW
          1998ChevroletTahoeBase (6.5 V8 DIESEL)
          1998ChevroletTahoeLS (6.5 V8 DIESEL)
          1998ChevroletTahoeLT (6.5 V8 DIESEL)
          1998ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1998ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1998ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1998ChevroletK2500 SuburbanLS (6.5 V8 DIESEL)Notes: 8600lb GVW
          1998ChevroletK2500 SuburbanLS (7.4 V8 GAS)Notes: 8600lb GVW
          1998ChevroletK2500 SuburbanLS (5.7 V8 GAS)Notes: 8600lb GVW
          1992ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1992ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1992ChevroletK2500 SuburbanSilverado (5.7 V8 GAS)Notes: 8600lb GVW
          1992ChevroletK2500 SuburbanSilverado (7.4 V8 GAS)Notes: 8600lb GVW
          1992ChevroletK3500Cheyenne (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1992ChevroletK3500Cheyenne (6.5 V8 DIESEL)
          1993ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1993ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1993ChevroletK2500 SuburbanSilverado (5.7 V8 GAS)Notes: 8600lb GVW
          1993ChevroletK2500 SuburbanSilverado (7.4 V8 GAS)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanSilverado (6.5 V8 DIESEL)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanSilverado (7.4 V8 GAS)Notes: 8600lb GVW
          1994ChevroletK2500 SuburbanSilverado (5.7 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLS (6.5 V8 DIESEL)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLS (5.7 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLS (7.4 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLT (6.5 V8 DIESEL)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLT (5.7 V8 GAS)Notes: 8600lb GVW
          1995ChevroletK2500 SuburbanLT (7.4 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLS (5.7 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLS (7.4 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLS (6.5 V8 DIESEL)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLT (7.4 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLT (6.5 V8 DIESEL)Notes: 8600lb GVW
          1996ChevroletK2500 SuburbanLT (5.7 V8 GAS)Notes: 8600lb GVW
          1996ChevroletK1500 SuburbanBase (6.5 V8 DIESEL)Notes: with 8 Lug Wheels
          1996ChevroletK1500 SuburbanBase (5.7 V8 GAS)Notes: with 8 Lug Wheels
          1996ChevroletK1500 SuburbanLS (5.7 V8 GAS)Notes: with 8 Lug Wheels
          1996ChevroletK1500 SuburbanLS (6.5 V8 DIESEL)Notes: with 8 Lug Wheels
          1996ChevroletK1500 SuburbanLT (6.5 V8 DIESEL)Notes: with 8 Lug Wheels
          1996ChevroletK1500 SuburbanLT (5.7 V8 GAS)Notes: with 8 Lug Wheels
          1997ChevroletK2500 SuburbanBase (5.7 V8 GAS)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanBase (6.5 V8 DIESEL)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanBase (7.4 V8 GAS)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLS (6.5 V8 DIESEL)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLS (5.7 V8 GAS)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLS (7.4 V8 GAS)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLT (6.5 V8 DIESEL)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLT (5.7 V8 GAS)Notes: 8600lb GVW
          1997ChevroletK2500 SuburbanLT (7.4 V8 GAS)Notes: 8600lb GVW
          1990ChevroletK3500Cheyenne (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Cheyenne (7.4 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Cheyenne (6.2 V8 DIESEL)Notes: without Dual Rear Wheels
          1990ChevroletK3500Scottsdale (6.2 V8 DIESEL)Notes: without Dual Rear Wheels
          1990ChevroletK3500Scottsdale (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Scottsdale (7.4 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Silverado (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Silverado (7.4 V8 GAS)Notes: without Dual Rear Wheels
          1990ChevroletK3500Silverado (6.2 V8 DIESEL)Notes: without Dual Rear Wheels
          1991ChevroletK3500Cheyenne (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1991ChevroletK3500Cheyenne (7.4 V8 GAS)Notes: without Dual Rear Wheels
          1991ChevroletK3500Cheyenne (6.2 V8 DIESEL)Notes: without Dual Rear Wheels
          1991ChevroletK3500Scottsdale (6.2 V8 DIESEL)Notes: without Dual Rear Wheels
          1991ChevroletK3500Scottsdale (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1991ChevroletK3500Scottsdale (7.4 V8 GAS)Notes: without Dual Rear Wheels
          1991ChevroletK3500Silverado (5.7 V8 GAS)Notes: without Dual Rear Wheels
          1991ChevroletK3500Silverado (7.4 V8 GAS)Notes: without Dual Rear Wheels
          There are more vehicles this part is compatible with. Check if it fits your vehicle.
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          Warranty Overview

          At Newparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.


          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, use our Return Portal or contact support.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.



          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For full details, please see our complete Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions,  risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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