Bendix ADB22X / ADB22X-V (air disc brakes)
Bendix Commercial Vehicle Systems · Brakes · Air disc brakes (foundation)
What this component does
Bendix ADB22X is the leading air-disc brake (ADB) for Class 7-8 commercial trucks — replaces traditional S-cam drum brakes with disc rotors. ADB advantages: shorter stopping distances (15-30% better than drum), no fade in repeated heavy braking, simpler maintenance (no slack adjustment, no brake shoe replacement — just pad changes). The downside: pad replacement is more frequent than drum shoes ($200-400/wheel pad set every 250-400K vs drum shoes lasting 350-500K).
Specifications
- Manufacturer
- Bendix Commercial Vehicle Systems
- Category
- Brakes
- Subtype
- Air disc brakes (foundation)
- Truck class
- Class 7-8
- Production
- 2005–present
- Applications
- All Class 7-8 with air-disc brake option
Design and engineering
Disc rotor on the axle hub. Caliper with two ceramic-composite pad sets. Air-actuated wedge mechanism converts air pressure to clamping force. ADB22X = single-piston caliper; ADB22X-V = variant for vocational/severe-duty.
Generations
- ADB22X Original (2005–2015)Launch as Bendix's flagship ADB.
- ADB22X-V (2016–present)Vocational variant with reinforced internals.
Reliability and longevity
Generally strong. Caliper guide pin wear at 400K-600K miles. Rotor warping in extreme heat (heavy-haul mountain descents).
Common problems
Caliper guide pin wear — symptoms include uneven pad wear and brake judder. Rotor warping from heavy-haul / mountain descent overheating. Pad rattle in some applications (addressed with anti-rattle shims).
Maintenance schedule
Pad inspection every brake PM (50K miles typical). Pad replacement at 250K-400K miles (highway use). Rotor inspection at every pad change.
Pros and cons
Pros
- ✓15-30% shorter stopping distance vs drum
- ✓No fade in repeated heavy braking
- ✓Simpler maintenance (no slack adjustment)
- ✓Pad replacement is faster than drum shoe replacement
Cons
- !More frequent pad replacement vs drum shoes
- !Higher initial cost vs drum
- !Caliper guide pin wear is recurring
Trucks that use this component
Related DTC codes
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