Air Disc Brake Pad Identification Guide
Professional air disc brake pad identification resource for commercial vehicles. Use our comprehensive lookup tool to find the right brake pads by caliper type, FMSI number, and application.
Air Disc Pads
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Types of Air Disc Brake Pads
By Application Type
- •Highway Premium: Designed for on-highway trucks, tractors, and trailers. Low-metallic formulation for quiet operation and long life.
- •Severe Service: For extreme conditions including transit buses, fire trucks, refuse haulers. Ceramic formulation for high temperature resistance.
- •Transit Premium: Specifically designed for transit buses with frequent stops. Optimized for urban driving cycles.
Major Caliper Brands
- •Bendix: ADB22X, ADB22X-LT - Most common in North American trucks
- •Meritor: ELSA, EX225 series - Popular on trailers and drive axles
- •Wabco: MAXX, PAN series - European design, gaining popularity
- •Knorr: SB/SN series - Common on transit buses and coaches
FMSI Numbers
The Friction Materials Standards Institute (FMSI) assigns standardized numbers to brake pad designs:
- • D1369: Bendix ADB22X standard pad
- • D1311: Meritor EX225H2 pad
- • D1777: Wabco MAXX22T/PAN 22 pad
- • D1203: Knorr SB7/SN7 transit pad
Attachment Technology
- •Integrally Molded: Friction material molded into backing plate holes
- •Wire Mesh: Welded mesh ensures mechanical attachment
- •Stress Relief Cuts: Prevent cracking and improve flexibility
How to Identify Your Air Disc Brake Pads
Identify Caliper
Look for manufacturer name and model on caliper body. Common: Bendix ADB22X, Meritor EX225
Find FMSI Number
Check edge marking on old pad or use caliper model to determine FMSI number
Measure Dimensions
Measure thickness, width, and height of pad. Note backing plate dimensions
Select Type
Choose Highway, Severe Service, or Transit based on your application
Important Air Disc Brake Pad Specifications
Critical Specifications
- • Axle Rating: Must meet or exceed vehicle GAWR
- • Wear Indicator: 5mm standard, check with borescope
- • Backing Plate: Must match caliper carrier exactly
- • Hardware: Always use new clips and springs
Replacement Guidelines
- • Replace pads in axle sets for even braking
- • Check rotor condition and thickness
- • Verify caliper slides freely
- • Use only DOT-approved replacement pads
Warning: Never mix pad types or brands on the same axle. Always follow manufacturer torque specifications.
Performance Comparison
| Pad Type | Axle Rating | Temperature Range | Typical Life | Best For |
|---|---|---|---|---|
| Highway Premium | 23,000 lbs | -40°F to 750°F | 150,000+ miles | Long haul, Highway |
| Severe Service | 28,660 lbs | -40°F to 950°F | 100,000+ miles | Transit, Refuse, Fire |
| Transit Premium | 28,660 lbs | -40°F to 850°F | 80,000+ miles | City buses, Frequent stops |
Air Disc Brake Pad Lookup Tool
Air Disc Brake Pad Lookup Filters
| OEM Part # | Alt Numbers | FMSI | Caliper | Type | Dimensions | Applications |
|---|---|---|---|---|---|---|
| K070796 | K129276, K182235, 29247 | D1369 | Bendix ADB22X, ADB22X-LT | Highway | 1.164" x 4.241" x 8.278" | On-Highway Truck (+3 more)
|
| K109113 | 29247SS | D1369 | Bendix ADB22X, ADB22X-LT | Severe Service | 1.164" x 4.241" x 8.278" | Transit Buses (+3 more)
|
| 79022040 | S-30560-8 | D1583 | Haldex DBT22LT, DB22LT | Highway | 1.165" x 3.687" x 8.272" | Highway Trucks (+2 more)
|
| K049274 | - | D1203 | Knorr SB7/SN7 | Transit | 1.2" x 4.5" x 9" | Transit Buses (+2 more)
|
| MCK1407 | - | D1407 | Meritor D-ELSA | Transit | 1.15" x 4.3" x 8.8" | Transit Buses (+2 more)
|
| MCK1310 | - | D1310 | Meritor D-ELSA2 | Transit | 1.138" x 4.4" x 8.9" | Modern Transit Buses (+2 more)
|
| MCK1312 | - | D1312 | Meritor D-LISA | Transit | 1.1" x 4.2" x 8.5" | Light Transit (+2 more)
|
| 2252HBMA703 | - | D1708 | Meritor ELSA 225-3 | Severe Service | 1.02" x 4.308" x 9.828" | Heavy Duty Severe Service (+2 more)
|
| KIT2252H2CD | MMD1311AF | D1311 | Meritor EX225H2 | Highway | 1.138" x 4.585" x 8.866" | Highway Trucks (+2 more)
|
| KIT2252H2SS | MMD1311AFSS | D1311 | Meritor EX225H2 | Severe Service | 1.138" x 4.585" x 8.866" | Transit Buses (+2 more)
|
| KIT2252H3CD | MMD1323AF | D1323 | Meritor EX225H3 | Highway | 1.164" x 4.585" x 8.866" | Latest Generation Highway Trucks (+1 more)
|
| KIT2252L2CD | - | D1370 | Meritor EX225L2 | Highway | 1.138" x 4.585" x 8.866" | Highway Trucks (+1 more)
|
| 4709002200 | - | D1777MAX | Wabco MAXX22T | Highway | 1.164" x 4.241" x 8.278" | Highway Trucks (+2 more)
|
| 4709002500 | - | D2061 | Wabco MAXXUS | Highway | 1.2" x 4.3" x 8.5" | Heavy Duty Highway (+1 more)
|
| 4709001700 | - | D1518 | Wabco PAN 17 | Highway | 1.1" x 3.9" x 7.8" | Medium Duty Trucks (+1 more)
|
| 4709001900 | - | D1438 | Wabco PAN 19 | Highway | 1.15" x 4" x 8" | Highway Trucks (+1 more)
|
| 4709002200 | - | D1777PAN | Wabco PAN 22 | Highway | 1.164" x 4.241" x 8.278" | Heavy Duty Highway (+2 more)
|
| 4709002200SS | - | D1777PAN | Wabco PAN 22 | Severe Service | 1.164" x 4.241" x 8.278" | Severe Duty (+2 more)
|
K070796
FMSI: D1369
Applications:
On-Highway Truck, Tractor Steer/Drive Axles, Motor Coaches, School Buses
Alternate Numbers: K129276, K182235, 29247
Features:
- • Low-metallic material
- • High shear resistance
- • Quiet stopping
K109113
FMSI: D1369
Applications:
Transit Buses, Fire Trucks, Refuse Haulers, Concrete Mixers
Alternate Numbers: 29247SS
Features:
- • Ceramic formulation
- • Extreme condition rated
- • High temperature resistance
79022040
FMSI: D1583
Applications:
Highway Trucks, Trailers, Motor Coaches
Alternate Numbers: S-30560-8
Features:
- • Highway premium formulation
- • Long pad life
- • Rotor compatible
K049274
FMSI: D1203
Applications:
Transit Buses, City Buses, Articulated Buses
Features:
- • Transit specific formulation
- • Frequent stop capability
- • Low dust
MCK1407
FMSI: D1407
Applications:
Transit Buses, Shuttle Buses, Airport Buses
MCK1310
FMSI: D1310
Applications:
Modern Transit Buses, Electric Buses, Hybrid Buses
MCK1312
FMSI: D1312
Applications:
Light Transit, Shuttle Services, Paratransit
2252HBMA703
FMSI: D1708
Applications:
Heavy Duty Severe Service, Transit, Refuse
KIT2252H2CD
FMSI: D1311
Applications:
Highway Trucks, Tractors, Trailers
Alternate Numbers: MMD1311AF
Features:
- • Dual stress relief cuts
- • 5mm wear indicator
- • Noise reduction channels
KIT2252H2SS
FMSI: D1311
Applications:
Transit Buses, Severe Duty Applications, Fire Equipment
Alternate Numbers: MMD1311AFSS
KIT2252H3CD
FMSI: D1323
Applications:
Latest Generation Highway Trucks, Advanced Air Disc Systems
Alternate Numbers: MMD1323AF
KIT2252L2CD
FMSI: D1370
Applications:
Highway Trucks, Long Haul Applications
4709002200
FMSI: D1777MAX
Applications:
Highway Trucks, Trailers, Motor Coaches
4709002500
FMSI: D2061
Applications:
Heavy Duty Highway, Long Haul Trucking
4709001700
FMSI: D1518
Applications:
Medium Duty Trucks, Regional Haul
4709001900
FMSI: D1438
Applications:
Highway Trucks, Coach Buses
4709002200
FMSI: D1777PAN
Applications:
Heavy Duty Highway, Long Haul, Trailers
4709002200SS
FMSI: D1777PAN
Applications:
Severe Duty, Transit, Refuse
Need Help Identifying Your Air Disc Brake Pads?
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