Brake Drum Identification Guide
Professional brake drum identification resource for commercial vehicles. Use our comprehensive lookup tool to find the right brake drum by specifications.
Brake Shoes
FMSI identification guide
Brake Rotors
Rotor specifications
Air Disc Pads
Air disc brake pads
Air Disc Calipers
Caliper identification
Types of Commercial Brake Drums
By Mounting Type
- •Outboard Drums: Most common type, mounted on the outside of the wheel hub
- •Inboard Drums: Mounted on the inside of the axle, typically for drive axles
- •Hub-Piloted: Centered by the wheel hub, common on newer vehicles
- •Stud-Piloted: Centered by the wheel studs, older design
Common Sizes
- •16.5" x 7": Most common trailer drum size
- •15" x 4": Light duty applications
- •12.25" x 7.5": Drive axle applications
- •18" x 7": Heavy duty/severe service
How to Identify Your Brake Drum
Measure Diameter
Measure the inside diameter of the drum where the brake shoes contact. Common sizes: 12.25", 15", 16.5", 18"
Measure Width
Measure the overall width/depth of the drum from front to back. Common widths: 3.5", 4", 5", 6", 7", 8.625"
Check Bolt Pattern
Count bolt holes and measure the bolt circle diameter. Common patterns: 10 on 11.25", 8 on 6.5"
Important Brake Drum Specifications
Critical Measurements
- • Maximum Diameter: Never exceed the stamped max diameter
- • Pilot Diameter: Must match hub for proper centering
- • Bolt Pattern: Must match wheel exactly
- • Weight Rating: Must meet or exceed vehicle GAWR
Replacement Guidelines
- • Replace drums in axle sets for even braking
- • Check for heat checking, cracks, or scoring
- • Measure diameter after machining
- • Use only DOT-approved replacement drums
Brake Drum Lookup Tool
Brake Drum Lookup Filters
| Part Number | Diameter | Width | Type | Bolt Pattern | Weight | Applications |
|---|---|---|---|---|---|---|
| 52856 | 12.25" | 7.5" | Inboard | 8 on 6.5 | 75 lbs | Meritor Q (+2 more)
|
| 52974 | 12.25" | 7.5" | Stud-Piloted | 8 on 6.5 | 72 lbs | Dana Spicer (+1 more)
|
| 53120 | 15" | 3.5" | Outboard | 10 on 11.25 | 82 lbs | Wagner Air Brake (+1 more)
|
| 52869 | 15" | 4" | Outboard | 10 on 11.25 | 85 lbs | Light Duty Trailer (+1 more)
|
| 52901 | 15" | 5" | Outboard | 10 on 11.25 | 88 lbs | Wagner Hydraulic (+1 more)
|
| 52923 | 15" | 6" | Outboard | 10 on 11.25 | 92 lbs | Stopmaster Wedge (+1 more)
|
| 52753 | 15" | 7" | Inboard | 8 on 6.5 | 92 lbs | Meritor Stopmaster (+1 more)
|
| 52985 | 15" | 7" | Outboard | 10 on 11.25 | 95 lbs | Meritor Q (+1 more)
|
| 53186 | 15" | 8.625" | Outboard | 10 on 11.25 | 105 lbs | Meritor Q Plus (+1 more)
|
| 52885 | 16.25" | 3.5" | Outboard | 10 on 11.25 | 88 lbs | Light Service (+1 more)
|
| 53033 | 16.5" | 5" | Outboard | 10 on 11.25 | 98 lbs | Meritor P (+1 more)
|
| 53106 | 16.5" | 5" | Outboard | 10 on 11.25 | 96 lbs | Eaton (+1 more)
|
| 53144 | 16.5" | 6" | Outboard | 10 on 11.25 | 105 lbs | Eaton (+1 more)
|
| 53996 | 16.5" | 6" | Hub-Piloted | 10 on 11.25 | 103 lbs | ConMet PreSet (+1 more)
|
| 53121 | 16.5" | 7" | Outboard | 10 on 11.25 | 112 lbs | Fruehauf (+2 more)
|
| 53195 | 16.5" | 7" | Outboard | 10 on 11.25 | 115 lbs | Meritor Q Plus (+2 more)
|
| 53197 | 16.5" | 7" | Hub-Piloted | 10 on 11.25 | 110 lbs | ConMet Hub-Piloted (+1 more)
|
| 54033 | 16.5" | 7" | Hub-Piloted | 10 on 11.25 | 115 lbs | ConMet PreSet Plus (+1 more)
|
| 54277 | 16.5" | 7" | Outboard | 10 on 11.25 | 118 lbs | Wide Base Tire (+1 more)
|
| 54456 | 16.5" | 7" | Outboard | 10 on 11.25 | 116 lbs | Centrifuse (+1 more)
|
| 61855 | 16.5" | 7" | Hub-Piloted | 10 on 11.25 | 114 lbs | ArvinMeritor (+1 more)
|
| 54073 | 16.5" | 8.625" | Outboard | 10 on 11.25 | 125 lbs | Meritor Q Plus Wide (+1 more)
|
| 53202 | 18" | 7" | Outboard | 10 on 11.25 | 135 lbs | Heavy Duty (+1 more)
|
| 53216 | 18" | 7" | Outboard | 10 on 11.25 | 132 lbs | Cast Iron Shoe (+1 more)
|
52856
Webb
Applications:
Meritor Q, Drive Axle, Standard Forge
Cross References: Gunite 2792A, ConMet 85123448001, Accuride 2792A, Dana/Spicer 670005
52974
Webb
Applications:
Dana Spicer, Drive Axle
53120
Webb
Applications:
Wagner Air Brake, Light Trailers
52869
Webb
Applications:
Light Duty Trailer, 15 x 4 Applications
Cross References: Gunite 2983C, ConMet 61528B, Accuride 2983C, DB154B
52901
Webb
Applications:
Wagner Hydraulic, Medium Duty
52923
Webb
Applications:
Stopmaster Wedge, Medium Service
52753
Webb
Applications:
Meritor Stopmaster, Drive Axle
52985
Webb
Applications:
Meritor Q, Standard Duty
Cross References: 3044A
53186
Webb
Applications:
Meritor Q Plus, Wide Track
52885
Webb
Applications:
Light Service, Meritor T
53033
Webb
Applications:
Meritor P, Standard Service
Cross References: 3282A
53106
Webb
Applications:
Eaton, Extended Service
53144
Webb
Applications:
Eaton, Medium Duty
Cross References: 3573A
53996
Webb
Applications:
ConMet PreSet, Hub-Piloted Systems
53121
Webb
Applications:
Fruehauf, Great Dane, Utility Trailers
Cross References: Gunite 3600AX, Gunite 3218X, ConMet 66864B, Accuride 3600AX, DB1657BSTW
53195
Webb
Applications:
Meritor Q Plus, Trailer Applications, 16.5 x 7 Q Brake
Cross References: Gunite 3721AX, Gunite 3721X, ConMet 107251, Accuride 3721AX
53197
Webb
Applications:
ConMet Hub-Piloted, Meritor TP
Cross References: Gunite 3800X, ConMet 65548B, Accuride 3800X, DB154MB, Meritor 85123448002
54033
Gunite
Applications:
ConMet PreSet Plus, Hub-Piloted
Cross References: Accuride 3800X, Webb 53197, ConMet 65548B, DB154MB
54277
Accuride
Applications:
Wide Base Tire, Super Single
Cross References: ConMet 66864B, Gunite 3600AX, Webb 53121, DB1657BSTW
54456
Centrifuse
Applications:
Centrifuse, Extended Life
Cross References: 3721CF
61855
ArvinMeritor
Applications:
ArvinMeritor, Hub-Piloted Trailer
54073
Webb
Applications:
Meritor Q Plus Wide, Extended Service
Cross References: Gunite 3722X, ConMet 107287, Accuride 3722X, Meritor 85123448003
53202
Webb
Applications:
Heavy Duty, Severe Service
Cross References: Gunite 3984AX, ConMet 107455, Accuride 3984AX, Meritor 85123448007
53216
Webb
Applications:
Cast Iron Shoe, Heavy Haul
Cross References: Gunite 3985AX, ConMet 107456, Accuride 3985AX
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