ACDelco Professional Rear Brake Drum
Gold
Pack of 1

ACDelco Professional Rear Brake Drum

GM Part #18028399

ACDelco Part #18B86

MSRP$60.06*

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

Bolt Hole Quantity5
MaterialCast Iron
Weight8.5lb
Outside Diameter0.356 in / 9.05 mm
ClassificationGold
Maximum Brake Diameter (Discard)201.42mm
ABS Sensor Ring IncludedNo
Depth2.12 in / 53.85 mm
Nominal Drum Diameter0.312 in / 7.95 mm
Stud/Lug Hole Diameter0.562 in / 14.25 mm
Brake Surface FinishTurned
Outer Cooling FinsNo

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).

ModelBody StyleTrimYear(s)
Skyhawk1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989
Skylark1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
Somerset1986, 1987
Somerset Regal1985

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.