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    ACDelco 18A82391 - Disc Brake Rotor (Front Left)

    MPN: 18A82391
    0.0
    Vehicle Specific
    Check if this part fits your vehicle.
    • $80.95
    In stock
      • Newparts SKU
        1787367
      • Weight
        23.1 lbs
      • Barcode
        00808709977117
      • Dimensions (L x W x H)
        14.25 x 13.25 x 3.88 in
      • Manufacturer Part #
        18A82391
    • Brand
      ACDelco
    • Position
      Front Left
    • Manufacturer
      ACDelco
    • MPN
      18A82391
    • Features
      ABS Tone Ring Included : No
      Center Hole Diameter : 2.787
      Center Hole Diameter : 70.8
      Construction : Full Cast
      Conventional Or Drum-In-Hat Type Rotor : Conventional
      Disc Finish : Coated
      Discard Thickness : 1.063
      Discard Thickness : 27
      FAQ - Answer 1 : Yes, ACDelco also offers GM OE brake rotor and Advantage brake rotors.
      FAQ - Question 1 : Does ACDelco offer other grades of brake rotors?
      Features & Benefits - Bullet 1 : COOL SHIELD(TM) coating - entire rotor surface including edges and vanes have baked-on zinc coating for durability and long lasting protection compared to uncoated
      Features & Benefits - Bullet 2 : Coated rotors will remain cleaner longer than non-coated
      Features & Benefits - Bullet 3 : Protective micron-thin layer helps to inhibit environmental corrosion better than non-coated roated rotors; proved in up to 200 hours of industry-standard salt-spray testing
      Features & Benefits - Bullet 4 : Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
      Features & Benefits - Bullet 5 : Premium aftermarket replacement part
      Features & Benefits - Bullet 6 : Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
      Good Maintenance Practices - Section 1 - Bullet 1 : Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
      Good Maintenance Practices - Section 1 - Bullet 2 : Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
      Good Maintenance Practices - Section 1 - Bullet 3 : Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
      Good Maintenance Practices - Section 1 - Bullet 4 : Check the thickness of your brake pads.
      Good Maintenance Practices - Section 1 - Header : The following inspections and maintenance procedures can help prevent potential brake problems:
      Good Maintenance Practices - Section 2 - Bullet 1 : Inspection of the brake hoses for brittleness or cracking.
      Good Maintenance Practices - Section 2 - Bullet 2 : Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
      Good Maintenance Practices - Section 2 - Bullet 3 : Inspection of wheel bearings and grease seals.
      Good Maintenance Practices - Section 2 - Bullet 4 : Parking brake adjustments (as needed).
      Good Maintenance Practices - Section 2 - Header : The following should be conducted by a qualified technician:
      Grade Type : Regular
      Height (in) : 3.88
      Inside Diameter : 190.5
      Inside Diameter : 7.5
      Length (in) : 14.25
      Material : Cast Iron
      Mounting Bolt Hole Circle Diameter : 115
      Mounting Bolt Hole Circle Diameter : 4.528
      Mounting Bolt Hole Diameter : 0.555
      Mounting Bolt Hole Diameter : 14.1
      Mounting Bolt Hole Quantity : 5
      Nominal Thickness : 1.185
      Nominal Thickness : 30.1
      Outside Diameter : 12.638
      Outside Diameter : 321
      Overall Height : 2.402
      Overall Height : 61
      Product Description : ACDelco Gold (Professional) Fully Coated Disc Brake Rotors are the high quality alternative to Original Equipment (OE) parts. These rotors are mounted to the wheel hub where the calipers can press the brake pads against the brake surface to help slow the vehicle. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. âš  WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov
      Programming Required : No
      Rust Resistant Coating : Yes
      Signs of Wear & Troubleshooting - Section 1 - Bullet 1 : Vehicle pulls to the left or right when brakes are applied.
      Signs of Wear & Troubleshooting - Section 1 - Bullet 2 : Visible ridges or deep grooves on the rotor surface.
      Solid Or Vented Type Rotor : Vented
      Stud/Lug Hole Quantity : 5
      Surface Type : Smooth
      Weight (lb) : 23.1
      Width (in) : 13.25
    • EAN
      00808709977117
    • Part Type
      Disc Brake Rotor
    • Fitment
      • Fitment Type
        Vehicle Specific
    YearMakeModelSubmodelNotes
    2015CadillacATSBase (2.0 L4 GAS)Notes: Slotted Brake Rotors
    2015CadillacATSBase (2.5 L4 GAS)Notes: Slotted Brake Rotors
    2015CadillacATSLuxury (2.0 L4 GAS)Notes: Slotted Brake Rotors
    2015CadillacATSLuxury (2.5 L4 GAS)Notes: Slotted Brake Rotors
    2015CadillacATSLuxury (3.6 V6 FLEX)Notes: Slotted Brake Rotors
    2015CadillacATSPerformance (3.6 V6 FLEX)Notes: Slotted Brake Rotors
    2015CadillacATSPerformance (2.0 L4 GAS)Notes: Slotted Brake Rotors
    2015CadillacATSPremium (3.6 V6 FLEX)Notes: Slotted Brake Rotors
    2015CadillacATSPremium (2.0 L4 GAS)Notes: Slotted Brake Rotors
    2016CadillacATSBase (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSBase (2.5 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSLuxury (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSLuxury (2.5 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSLuxury (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSPerformance (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSPerformance (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSPremium (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSPremium (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2016CadillacATSV (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2017CadillacATSBase (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2017CadillacATSLuxury (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2017CadillacATSPremium Luxury (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2017CadillacATSPremium Performance (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2017CadillacATSV (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2018CadillacATSBase (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2018CadillacATSLuxury (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2018CadillacATSPremium Luxury (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2018CadillacATSPremium Performance (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2018CadillacATSV (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2019CadillacATSBase (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2019CadillacATSLuxury (2.0 L4 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2019CadillacATSPremium Luxury (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2019CadillacATSPremium Performance (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
    2019CadillacATSV (3.6 V6 GAS)Notes: w/ Brembo Calipers, Slotted Brake Rotors
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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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