ACDelco Professional Rear Brake Drum Assembly
Gold
Pack of 1

ACDelco Professional Rear Brake Drum Assembly

GM Part #89058348

ACDelco Part #18B488

MSRP$116.18*

ACDelco Professional Brake Drums are constructed with G3000 SAE qualified material for structural integrity and maximum service life.

  • Inspected for balance; resulting in smooth brake operation and noise reduction
  • Independently tested with Noise/Vibration/Harshness (NVH) and durability/wear testing; resulting in high quality and reliable products
  • Follows original manufacturers' designs for dispersing heat, helping to prolong pad and rotor life while reducing noise and vibration

Pack of 1

About this product

ACDelco Professional Brake Drums are constructed with G3000 SAE qualified material for structural integrity and maximum service life. They are tested to ISO/TS 16949 quality system standards and validated for balance to provide better braking performance. Chamfer angle, vane configuration, and plate thickness all follow the OE design, making them a premium aftermarket replacement for your GM and non-GM vehicle. Also, no machining is required. ACDelco Professional Brake Drums are ready to be installed right out of the box.

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  • Inspected for balance; resulting in smooth brake operation and noise reduction
  • Independently tested with Noise/Vibration/Harshness (NVH) and durability/wear testing; resulting in high quality and reliable products
  • Follows original manufacturers' designs for dispersing heat, helping to prolong pad and rotor life while reducing noise and vibration

MaterialCast Iron
Bolt Hole Quantity5
ClassificationGold
Outside Diameter11.64 in / 295.7 mm
Weight14.85lb
Brake Surface FinishTurned

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:

  • Squealing or scraping noises.
  • Brake pedal pulsation (not to be confused with normal ABS operation).

Frequently Asked Questions

No, but it is a good idea to inspect them for wear-out, cracking, leaking etc.

Yes, ACDelco also offers GM OE and Advantage brake drums.

No, but it is a good idea to inspect them at every tire rotation.