Air Disc Brake Rotor Identification Guide
Professional air disc brake rotor identification resource for commercial vehicles. Find the right rotor for your Bendix, Meritor, Wabco, or Knorr-Bremse air disc brake system.
Rotors
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Understanding Air Disc Brake Rotors
Standard Air Disc Rotor Sizes
- •430mm (16.93"): Most common size for Class 8 trucks and trailers
- •434mm (17.09"): Used with Meritor EX+ calipers
- •377mm (14.84"): Medium duty applications
- •408mm (16.06"): Transit bus applications
Rotor Thickness Standards
- •45mm (1.77"): Standard thickness for heavy duty
- •37mm (1.46"): Minimum thickness (typical)
- •34mm (1.34"): Medium duty thickness
- •38mm (1.50"): Transit/coach applications
Rotor Construction
- •Vented Design: All air disc rotors are vented for optimal cooling
- •Pillar Vane: Standard cooling vane design for most applications
- •Directional Vane: Enhanced cooling for severe service
- •Cast Iron G3000: Standard material specification
Mounting Specifications
- •10-Bolt Pattern: Most common for Class 8 trucks (10 on 11.25")
- •8-Bolt Pattern: Medium duty and some trailer applications
- •Hat Height: Critical for proper caliper alignment
- •Pilot Bore: Must match hub for proper centering
Caliper System Compatibility
Bendix Systems
- • ADB22X: 430mm rotor
- • ADB22X-LT: 430mm rotor
- • Min thickness: 37mm
- • Standard: 45mm thick
Meritor Systems
- • EX225: 434mm rotor
- • ELSA: 430mm rotor
- • Min thickness: 40-41mm
- • Standard: 45mm thick
Wabco/Knorr Systems
- • PAN/MAXX: 430mm rotor
- • SB/SN: 430mm rotor
- • Min thickness: 37-40mm
- • Standard: 45mm thick
How to Identify Your Air Disc Brake Rotor
Step 1
Check Caliper Type
Identify your caliper brand and model (Bendix ADB22X, Meritor EX225, etc.)
Step 2
Measure Diameter
Measure rotor diameter in mm. Common: 430mm (16.93") or 434mm (17.09")
Step 3
Check Thickness
Measure current thickness and check minimum stamped on rotor
Step 4
Verify Bolt Pattern
Count bolt holes and measure bolt circle diameter
Critical Air Disc Rotor Specifications
Service Limits
- • Minimum Thickness: Stamped on rotor (typically 37-41mm)
- • Maximum Runout: 0.1mm (0.004") lateral
- • Thickness Variation: Maximum 0.025mm (0.001")
- • Surface Finish: 1.6μm Ra maximum
Replacement Indicators
- • Heat checking or cracking visible
- • Blue discoloration from overheating
- • Deep scoring or grooves
- • Thickness at or near minimum
Warning: Always replace rotors in axle sets. Never mix rotor brands or specifications on the same axle.
Common Air Disc Rotor Applications
| Application | Diameter | Thickness | Min Thick | Bolt Pattern | Compatible Calipers |
|---|---|---|---|---|---|
| Class 8 Truck | 430mm | 45mm | 37mm | 10 on 11.25" | Bendix ADB22X |
| Trailer | 430mm | 45mm | 37mm | 10 on 11.25" | Haldex DBT22LT |
| Long Haul | 434mm | 45mm | 41mm | 10 on 11.25" | Meritor EX225 |
| Transit Bus | 430mm | 45mm | 40mm | 10 on 11.25" | Knorr SB7000 |
| Medium Duty | 377mm | 34mm | 30mm | 8 on 6.5" | Wabco PAN 17 |
Air Disc Brake Rotor Lookup Tool
Found 14 rotors
| OEM Part # | Alt Numbers | Brand | Diameter | Thickness | Min Thick | Compatible Calipers | Applications |
|---|---|---|---|---|---|---|---|
| K070127 | BW7533, 141554 | Bendix | 430mm (16.93") | 45mm | 37mm | ADB22XADB22X-LTPAN 22MAXX22T | Class 8 Trucks, Tractors, Trailers, Buses |
| K111386 | BW7684 | Bendix | 434mm (17.09") | 45mm | 37mm | ADB22XADB22X-LT | Heavy Duty Trucks, Severe Service |
| 23-123515-002 | 53-123515-002, MR95000 | Meritor | 434mm (17.09") | 45mm | 41mm | EX225H2EX225H3EX225L2 | Highway Trucks, Long Haul, Trailers |
| 23-123516-002 | 53-123516-002 | Meritor | 430mm (16.93") | 45mm | 41mm | EX225H2EX225L2 | Standard Duty, Trailers |
| 61-123517-002 | ELSA430 | Meritor | 430mm (16.93") | 45mm | 40mm | ELSA 225-3D-ELSAD-ELSA2 | Severe Service, Transit, Mining |
| 4079001500 | PAN430V | Wabco | 430mm (16.93") | 45mm | 37mm | PAN 22PAN 19MAXX22T | European Trucks, Heavy Duty, Trailers |
| 4079001700 | MAXX430 | Wabco | 430mm (16.93") | 45mm | 37mm | MAXX22TMAXXUS | Premium Applications, Fleet Service |
| 4079001400 | PAN377V | Wabco | 377mm (14.84") | 34mm | 30mm | PAN 17 | Medium Duty, Regional Haul, Delivery |
| K039859 | SB7000R, SN7000R | Knorr-Bremse | 432mm (17") | 45mm | 40mm | SB7000SN7000 | Transit Buses, Coaches, City Buses |
| K039860 | SL7R | Knorr-Bremse | 380mm (14.96") | 38mm | 34mm | SL7 | Light Commercial, Small Buses, Delivery Vans |
| 95001501 | DBT22R, ModulT430 | Haldex | 430mm (16.93") | 45mm | 37mm | DBT22LTDB22LT | Trucks, Trailers, Buses |
| 95001502 | DBT22R-HD | Haldex | 430mm (16.93") | 45mm | 37mm | DBT22LTDB22LT | Heavy Duty, Severe Service |
| WB430HP10 | 66864B, 54073B | Webb | 430mm (16.93") | 45mm | 37mm | ADB22XPAN 22DBT22LTMAXX22T | Universal Fitment, Multi-Brand Compatible |
| WB434HP10 | 66865B, 54074B | Webb | 434mm (17.09") | 45mm | 37mm | EX225H2EX225H3ADB22X | Universal Fitment, Multi-Brand Compatible |
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