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ACDelco 18B275A - Brake Drum - Rear, 6 Bolt Holes, 5.5" Bolt Circle, Directional, Cast Iron
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ACDELCO part description
Technical Specifications
| Part Number | 18B275A |
| weight | 25 lb |
Product Description
Rear Brake Drum
Product Attributes
| Material | Cast Iron |
| Bolt Hole Quantity | 6 |
| Outside Diameter | 338.84mm (13.34 in.) |
| Bolt Hole Diameter | 0.586 in. |
| Bolt Circle Diameter | 139.7mm (5.5 in.) |
| Drum Type | Directional |
| Maximum Diameter | 284.73mm (11.21 in.) |
| Maximum Diameter | 284.73mm (11.21 in.) |
| Nominal Diameter | 284.73mm (11.21 in.) |
| Nominal Diameter | 284.73mm (11.21 in.) |
| Programming Required | No |
| Programming Required | No |
| Quantity | 1 per Pack |
| Quantity | 1 per Pack |
| Mount Hole Diameter (in) | 0.586in |
| Center Bore Diameter (in) | 3.1in |
| Height (in) | 4.7 in |
| Bolt Circle Diameter | 5.5 IN |
| Nominal Brake Drum Diameter (in) | 11.15in |
| Maximum Brake Diameter (Discard) | 11.21 IN |
| Width (in) | 13.6 in |
| Length (In) | 13.6 IN |
| Depth | 85.85 MM |
| Mount Hole Diameter (mm) | 14.884mm |
| Weight | 25 lb |
| Center Bore Diameter (mm) | 78.7mm |
| Bolt Circle Diameter | 139.7 MM |
| Nominal Brake Drum Diameter (mm) | 281.9mm |
| Maximum Brake Diameter (Discard) | 284.73 MM |
| Outside Diameter | 13.35 MM |
| Depth | 3.38 IN |
| Product Description | ACDelco Advantage Brake Drums are constructed with G3000 material for maximum service life. They are validated for balance to provide better braking performance. Chamfer angle, vane configuration, and plate thickness all follow the OE design. Also, no machining is required. ACDelco Advantage Brake Drums are ready to be installed right out of the box. ⚠<b> WARNING:</b> Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 5 | Brake pedal pulsation (not to be confused with normal ABS operation). |
| 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 1 | Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations. |
| Brake Surface Finish | Directional |
| FAQ - Question 1 | Do I have to replace all my brake parts when replacing my brake drums? |
| FAQ - Question 3 | Do I have to replace my brake drums after a certain amount of time? |
| FAQ - Question 2 | Does ACDelco offer other grades of brake drums? |
| Features & Benefits - Bullet 2 | Drums are inspected for balance; resulting in smooth brake operation and noise reduction |
| 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 2 - Bullet 2 | Inspection of brake lining and pads for wear or contamination by brake fluid or grease. |
| Good Maintenance Practices - Section 2 - Bullet 1 | Inspection of the brake hoses for brittleness or cracking. |
| Good Maintenance Practices - Section 2 - Bullet 3 | Inspection of wheel bearings and grease seals. |
| Features & Benefits - Bullet 1 | Mill-balanced for proper rotor function, no extra weights are needed |
| Includes ABS Sensor Ring | No |
| FAQ - Answer 3 | No, but it is a good idea to inspect them at every tire rotation. |
| FAQ - Answer 1 | No, but it is a good idea to inspect them for wear-out, cracking, leaking, etc. |
| Features & Benefits - Bullet 4 | Non-directional brake surface finish for consistent braking |
| Good Maintenance Practices - Section 2 - Bullet 4 | Parking brake adjustments (as needed). |
| Features & Benefits - Bullet 3 | Quality validated for proper metallurgy and correct brake plate thickness |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 4 | Squealing or scraping noises. |
| Good Maintenance Practices - Section 1 - Header | The following inspections and maintenance procedures can help prevent potential brake problems: |
| Good Maintenance Practices - Section 2 - Header | The following should be conducted by a qualified technician: |
| Cooling Fins | Yes |
| FAQ - Answer 2 | Yes, ACDelco also offers GM OE and Professional brake drums. |
| Nominal Drum Diameter | 0.441 IN |
| Nominal Drum Diameter | 11.2 MM |
| Outer Cooling Fins | Yes |
| Outside Diameter | 0.525 IN |
| Stud/Lug Hole Diameter | 0.578 IN |
| Stud/Lug Hole Diameter | 14.7 MM |
| Stud/Lug Hole Quantity | 6 |
Additional Information
| Warranty Special | 12 Months/Unlimited Miles Warranty (Parts Only). Please see ACDelco.com for more details|12 Months/20,000 Kilometers (Parts Only). Please see ACDelcocanada.com for more details |
| Harmonized Tariff Code (HTS) | 8708305020 |
| Country of Origin (Primary) | CN |
| Warranty Special UOM | TX |
| UPC | 00707773625736 |
A true OEM auto parts brand for GM and non-GM vehicles, ACDelco® offers a wide portfolio of parts designed to keep vehicles on the road longer. These parts work precisely and fit perfectly because they are designed, engineered, tested, and backed by General Motors. But ACDelco also carries aftermarket components that go through the same 18-step quality approval process as the OE parts. Whether customers choose OE or aftermarket, they’d get the same reliable performance, precise engineering, and superior reliability for years to come. ACDelco’s expansive product portfolio includes alternators, filters, batteries, brakes, belts and hoses, oil and fluids, and suspension parts. These products are made to meet GM and non-GM vehicles’ ever-evolving powertrain, collision, maintenance, and repair needs.
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