Air Disc Brake Caliper Identification Guide
Professional air disc brake caliper identification resource for commercial vehicles. Use our comprehensive lookup tool to identify calipers and find compatible pads, rotors, and service parts.
Calipers
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Understanding Air Disc Brake Calipers
Caliper Types
- •Single Piston: Most common design with one or two pistons on one side. Caliper slides to apply equal pressure.
- •Twin Piston: Two pistons provide higher clamping force. Common in heavy duty and transit applications.
- •Sliding Caliper: Caliper slides on pins or guides. Simple design with fewer parts.
- •Fixed Caliper: Caliper doesn't move; pistons on both sides. Better heat dissipation but more complex.
Major Manufacturers
- •Bendix: ADB22X series - Market leader in North America
- •Meritor: EX+ and ELSA series - Popular on trailers and drive axles
- •Wabco: PAN and MAXX series - European design, growing market share
- •Knorr-Bremse: SB/SN/SL series - Common on buses and European trucks
- •Haldex: ModulT series - Lightweight, trailer focused
Key Components
- •Caliper Housing: Cast iron or aluminum body containing pistons
- •Pistons: Apply pressure to brake pads when air pressure is applied
- •Adjuster Mechanism: Automatic adjustment for pad wear
- •Guide Pins/Slides: Allow caliper movement (sliding types)
Mounting Types
- •Radial Mount: Bolts perpendicular to rotor face. Most common design.
- •Axial Mount: Bolts parallel to axle. Often used on drive axles.
- •Frame Mount: Mounts directly to vehicle frame or suspension.
How to Identify Your Air Disc Brake Caliper
Find Manufacturer
Look for cast or stamped manufacturer name on caliper body (Bendix, Meritor, Wabco, etc.)
Locate Model Number
Find model designation (ADB22X, EX225H2, PAN22, etc.) usually near manufacturer name
Check Part Number
Note the complete part number for exact identification and service parts
Verify Compatibility
Check compatible pad FMSI numbers and rotor specifications
Important Caliper Specifications & Maintenance
Critical Specifications
- • Piston Size: Determines clamping force (17-24mm typical)
- • Mounting Bolts: Must be torqued to specification
- • Guide Pins: Must slide freely without binding
- • Minimum Rotor Thickness: Never exceed wear limits
Maintenance Guidelines
- • Service guide pins and boots every pad change
- • Check for leaks at piston seals
- • Verify adjuster mechanism operation
- • Use OEM service kits for rebuilds
Warning: Always replace calipers in axle sets. Never mix different caliper models on the same axle.
Popular Caliper Models Comparison
| Model | Manufacturer | Type | Max Force | Weight | Best For |
|---|---|---|---|---|---|
| ADB22X | Bendix | Single Piston | 30 kN | 77 lbs | All positions, versatile |
| EX225H2 | Meritor | Single Piston | 28 kN | 75 lbs | Highway, long haul |
| PAN 22 | Wabco | Single Piston | 30 kN | 74 lbs | Heavy duty trucks |
| SB7000 | Knorr-Bremse | Twin Piston | 32 kN | 85 lbs | Transit buses |
| DBT22LT | Haldex | Single Piston | 28 kN | 73 lbs | Trailers |
Common Caliper Issues & Solutions
Uneven Pad Wear
- • Check guide pin movement and lubrication
- • Verify caliper slides freely on carrier
- • Inspect for bent or damaged hardware
Brake Drag
- • Check adjuster mechanism for over-adjustment
- • Verify piston retraction
- • Inspect air chamber and slack adjuster
Noise Issues
- • Check pad hardware and shims
- • Verify proper pad installation
- • Inspect rotor surface condition
Poor Braking Performance
- • Verify correct pad type for application
- • Check for air system issues
- • Inspect for contaminated pads
Air Disc Brake Caliper Lookup Tool
Air Disc Brake Caliper Lookup Filters
| Part Number | Manufacturer | Model | Type | Compatible Pads | Applications |
|---|---|---|---|---|---|
| K046741 | Bendix | ADB22X ADB Series | Single Piston | D1369 | Class 8 Trucks (+3 more)
Features:
|
| K074777 | Bendix | ADB22X-LT ADB Series | Single Piston | D1369 | Light Trucks (+2 more)
Features:
|
| 95001002 | Haldex | DB22LT ModulT Series | Single Piston | D1583 | Standard Duty (+1 more)
Features:
|
| 95001001 | Haldex | DBT22LT ModulT Series | Single Piston | D1583 | Trailers (+2 more)
Features:
|
| K002432 | Knorr-Bremse | SB7000 SB Series | Twin Piston | D1203 | Transit Buses (+2 more)
Features:
|
| K002520 | Knorr-Bremse | SL7 SL Series | Single Piston | D1450 | Light Commercial (+2 more)
Features:
|
| K002433 | Knorr-Bremse | SN7000 SN Series | Twin Piston | D1203 | Coach Buses (+2 more)
Features:
|
| MCK1407 | Meritor | D-ELSA ELSA Series | Twin Piston | D1407 | Transit Buses (+1 more)
Features:
|
| MCK1310 | Meritor | D-ELSA2 ELSA Series | Twin Piston | D1310 | Modern Transit Buses (+2 more)
Features:
|
| MCK1312 | Meritor | D-LISA LISA Series | Single Piston | D1312 | Light Transit (+2 more)
Features:
|
| ELSA225 | Meritor | ELSA 225-3 ELSA Series | Twin Piston | D1708 | Heavy Duty (+2 more)
Features:
|
| MCK1235 | Meritor | EX225H2 EX+ Series | Single Piston | D1311 | Highway Trucks (+2 more)
Features:
|
| MCK1270 | Meritor | EX225H3 EX+ Series | Single Piston | D1323, D1311 | Latest Generation Trucks (+1 more)
Features:
|
| MCK1236 | Meritor | EX225L2 EX+ Series | Single Piston | D1370 | Trailers (+1 more)
Features:
|
| 4005002200 | Wabco | MAXX22T MAXX Series | Single Piston | D1777MAX | Premium Trucks (+1 more)
Features:
|
| 4005002500 | Wabco | MAXXUS MAXX Series | Single Piston | D2061 | Heavy Duty (+2 more)
Features:
|
| 4005001500 | Wabco | PAN 17 PAN Series | Single Piston | D1518 | Medium Duty Trucks (+2 more)
Features:
|
| 4005001600 | Wabco | PAN 19 PAN Series | Single Piston | D1438 | Trucks (+2 more)
Features:
|
| 4005001700 | Wabco | PAN 22 PAN Series | Single Piston | D1777PAN | Heavy Duty Trucks (+2 more)
Features:
|
Bendix ADB22X
P/N: K046741
ADB Series
Applications:
Class 8 Trucks, Trailers, Buses, Heavy Duty Vehicles
Features:
- • 22mm twin piston design
- • Automatic pad wear adjustment
- • Integrated parking brake
Bendix ADB22X-LT
P/N: K074777
ADB Series
Applications:
Light Trucks, Medium Duty, School Buses
Features:
- • Lighter weight version
- • Optimized for medium duty
- • Same pad as ADB22X
Haldex DB22LT
P/N: 95001002
ModulT Series
Applications:
Standard Duty, Fleet Applications
Features:
- • Standard ModulT
- • Proven reliability
- • Easy maintenance
Haldex DBT22LT
P/N: 95001001
ModulT Series
Applications:
Trailers, Trucks, Buses
Features:
- • ModulT disc brake
- • Lightweight design
- • Integrated adjuster
Knorr-Bremse SB7000
P/N: K002432
SB Series
Applications:
Transit Buses, City Buses, Articulated Buses
Features:
- • Transit specific design
- • 70mm twin piston
- • High frequency braking
Knorr-Bremse SL7
P/N: K002520
SL Series
Applications:
Light Commercial, Delivery Vans, Small Buses
Features:
- • Lightweight series
- • Compact design
- • Cost effective
Knorr-Bremse SN7000
P/N: K002433
SN Series
Applications:
Coach Buses, Tourist Buses, Long Distance
Features:
- • Coach optimized
- • Quiet operation
- • Premium finish
Meritor D-ELSA
P/N: MCK1407
ELSA Series
Applications:
Transit Buses, City Buses
Features:
- • Transit specific design
- • Frequent stop capability
- • Enhanced cooling
Meritor D-ELSA2
P/N: MCK1310
ELSA Series
Applications:
Modern Transit Buses, Electric Buses, Hybrid Buses
Features:
- • Second generation transit design
- • Regenerative braking compatible
- • Quiet operation
Meritor D-LISA
P/N: MCK1312
LISA Series
Applications:
Light Transit, Shuttle Buses, Paratransit
Features:
- • Lightweight design
- • Ideal for smaller buses
- • Lower maintenance costs
Meritor ELSA 225-3
P/N: ELSA225
ELSA Series
Applications:
Heavy Duty, Severe Service, Mining
Features:
- • European design
- • Twin piston for high force
- • Severe duty rated
Meritor EX225H2
P/N: MCK1235
EX+ Series
Applications:
Highway Trucks, Long Haul, Trailers
Features:
- • Single large piston design
- • EX+ Life Series
- • Longer service intervals
Meritor EX225H3
P/N: MCK1270
EX+ Series
Applications:
Latest Generation Trucks, Advanced Air Disc Systems
Features:
- • Third generation design
- • Improved heat dissipation
- • Enhanced durability
Meritor EX225L2
P/N: MCK1236
EX+ Series
Applications:
Trailers, Long Combination Vehicles
Features:
- • Optimized for trailer applications
- • Long life design
- • Reduced maintenance
Wabco MAXX22T
P/N: 4005002200
MAXX Series
Applications:
Premium Trucks, Fleet Applications
Features:
- • MAXX life series
- • Extended warranty
- • Premium performance
Wabco MAXXUS
P/N: 4005002500
MAXX Series
Applications:
Heavy Duty, Severe Service, Mining
Features:
- • Largest MAXX series
- • Maximum stopping power
- • Severe duty rated
Wabco PAN 17
P/N: 4005001500
PAN Series
Applications:
Medium Duty Trucks, Regional Haul, Delivery Trucks
Features:
- • Compact design
- • 17mm twin piston
- • Integrated adjuster
Wabco PAN 19
P/N: 4005001600
PAN Series
Applications:
Trucks, Coaches, Medium Heavy Duty
Features:
- • 19mm twin piston
- • Balanced performance
- • European engineering
Wabco PAN 22
P/N: 4005001700
PAN Series
Applications:
Heavy Duty Trucks, Long Haul, Trailers
Features:
- • 22mm twin piston
- • High performance
- • Low maintenance
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