When is CVSA Brake Safety Week 2026?

August 23–29, 2026, across the United States, Canada and Mexico. CVSA also runs unannounced one-day Brake Check events during the year, so the checklist above is worth running at every preventive maintenance interval — not just in August.

What is the focus area of Brake Safety Week 2026?

Brake drums and rotors. Inspectors will record the condition of drums and rotors in addition to the standard brake inspection — cracks, missing material, contamination and severe wear are the defects most likely to be cited.

What puts a truck out of service for brakes?

The most common triggers are brakes out of adjustment (20% or more defective brakes places the vehicle out of service), audible air leaks or failed leak tests, inoperative low-air warning, damaged hoses or tubing, and cracked or contaminated friction components including drums and rotors.

How do I check brake chamber pushrod stroke?

With the system at full pressure and wheels chocked, mark the pushrod at rest, have the service brake fully applied, and measure the travel. Compare against the adjustment limit stamped for the chamber size and type. Any brake at or beyond its limit needs immediate adjustment or component replacement.

Which parts should I stock before the inspection blitz?

The highest-turnover items during brake campaigns are brake chamber diaphragms and complete chambers, air dryer cartridges, compressor repair kits, governor and purge valves, hoses and caliper service kits — all available in the VADEN ORIGINAL catalogue with OE cross-references.

At what air pressure should the low-air warning light or buzzer come on during a pre-trip check?

With the ignition on, the low-air warning light or buzzer must activate before system pressure drops below about 60 psi, and the ABS malfunction lamp should cycle off once its self-check finishes. If the warning triggers later than that or fails to clear, treat it as a defect and have the system checked before the vehicle goes back on the road.

How fast should air pressure build up when I test the compressor?

With the engine running at operating RPM, pressure on a dual air system should build from 85 to 100 psi in about 45 seconds. A slower build-up usually points to a worn compressor, a leaking line, or a governor that isn't cutting in correctly, and should be diagnosed before the truck is dispatched.

What are normal governor cut-in and cut-out pressures on an air brake system?

The compressor should cut out at its specified pressure, typically 120 to 135 psi, and cut back in roughly 20 to 25 psi lower. Readings outside that range usually signal a governor or unloader problem, so always confirm the exact figures against the vehicle manufacturer's current service data.

How much air pressure loss is acceptable during a static leak test?

With the engine off and brakes released, pressure loss should not exceed about 2 psi per minute (3 psi for combination vehicles). With the service brake fully applied, the limit is roughly 3 psi per minute, or 4 psi for combinations. Anything beyond that points to a leak that needs to be traced and repaired.

At what pressure do the spring brakes automatically apply?

As air pressure is fanned down during testing, the tractor protection valve should close and the spring brakes should apply on their own somewhere in the 20 to 45 psi range. If they engage outside that window, the protection valve or spring brake modules should be inspected before the vehicle returns to service.

Fleet & Compliance

DOT Air Brake Inspection Checklist: Pass CVSA Brake Safety Week 2026

CVSA Brake Safety Week 2026 checklist for trucks: leak-test limits, pushrod stroke, governor cut-in and cut-out, drums and rotors, plus common violations.

15 Jul 2026 4 min read

CVSA Brake Safety Week 2026 runs August 23–29. During that week, certified inspectors across the U.S., Canada and Mexico will pull thousands of trucks and buses for brake-focused inspections — and vehicles with critical brake violations go straight out of service. This year's announced focus area: brake drums and rotors. Use the checklist below to find and fix problems before an inspector does.

What happens during a DOT brake inspection?

Most roadside checks follow the CVSA North American Standard: a Level I inspection covers the full vehicle and driver (37-step procedure including brakes), Level IV/V focus on the vehicle only, and Brake Safety Week concentrates specifically on the brake system. Inspectors check brake components visually, measure pushrod stroke, listen for air leaks and — in 2026 — pay special attention to the condition of drums and rotors. Roughly one in eight vehicles inspected during recent brake safety campaigns was placed out of service for brake violations.

Air brake pre-inspection checklist

Warning systems: with ignition on, verify the low-air warning (light/buzzer) activates before system pressure drops below about 60 psi, and the ABS malfunction lamp cycles off after self-check.
Compressor build-up test: with the engine at operating RPM, pressure should build from 85 to 100 psi within about 45 seconds on a dual air system. Slow build-up points to a worn compressor or leaking lines.
Governor cut-in/cut-out: the compressor should cut out at its specified pressure (typically 120–135 psi) and cut back in roughly 20–25 psi lower. Values outside spec mean governor or unloader problems.
Static leak test: engine off, brakes released — pressure loss should not exceed about 2 psi per minute (3 psi for combination vehicles). Then with the service brake fully applied: no more than about 3 psi per minute (4 psi for combinations).
Spring brake activation: continue lowering pressure by fanning the brakes — the tractor protection valve should close and the spring brakes should apply automatically in the 20–45 psi range.
Pushrod stroke: mark and measure each brake chamber (brake cylinder) pushrod at full application. Stroke beyond the adjustment limit for the chamber size is the single most common out-of-service brake defect — if 20% or more of the brakes are out of adjustment, the vehicle is out of service.
Hoses and tubing: look for chafed, bulging, kinked or leaking air hoses and damaged glad hands — hose and tubing defects are consistently among the most cited violations.
Drums and rotors (2026 focus): check drums for external cracks, missing chunks and oil or grease contamination; rotors for severe rust jacking, heavy grooving or cracks through to the edge. Check lining thickness and contamination at the same time.
Air dryer service: drain the tanks — water or oily emulsion means the air dryer cartridge is saturated and should be replaced before moisture reaches the valves.
Documentation: keep the last periodic inspection report and repair records available; missing annual-inspection proof is an easy violation to avoid.

Note: exact test values vary by vehicle and chamber type — always follow the manufacturer's service data and your carrier's inspection procedure. This checklist summarizes common North American practice and CVSA out-of-service criteria themes; it does not replace them.

Standards and further reading

This subject is governed by the equipment rules for air-braked commercial vehicles. In the United States the federal air brake standard, FMVSS 121 (49 CFR 571.121) defines the reservoirs, protection and timing a compliant system must provide, and Europe applies the equivalent limits of UNECE Regulation No. 13. For further detail, see the on-road braking performance requirement in 49 CFR 393.52. Always confirm specific figures against the current regulation and the vehicle manufacturer service data.

Inspection practice differs by country. In the United Kingdom the defect definitions and the pass or fail criteria for heavy goods vehicles are set out in the DVSA HGV inspection manual; in South Africa the underlying instrument is the National Road Traffic Act 93 of 1996.

Most common brake violations — and the parts behind them

Violation	Typical root cause	Related VADEN parts
Brakes out of adjustment	Worn chamber diaphragm, seized components, wrong stroke setup	Brake Cylinders (Brake Chambers)
Air leaks / slow pressure build	Worn compressor, leaking unloader or governor	Air Brake Compressors · Compressor Repair Kits
Moisture in system / frozen valves	Saturated desiccant, failed purge valve	Air Dryer Cartridges · Air Processing Units · Air Dryer Valves
Defective disc brake components	Seized caliper mechanism, worn pins and tappets	Air Disc Brake Caliper Parts

Why prepare now?

Brake Safety Week is announced in advance for a reason: CVSA wants defects fixed, not just cited. An out-of-service order during the blitz means towing, emergency repair at premium prices and lost loads. A one-hour shop check in early August — chambers, hoses, dryer cartridge, pushrod stroke, drums and rotors — costs a fraction of that. VADEN ORIGINAL manufactures OE-quality air brake components for exactly these service points, cross-referenced to Bendix, Wabco, Knorr-Bremse and Haldex numbers — see the Bendix cross reference to match your existing part numbers.

Frequently Asked Questions

When is CVSA Brake Safety Week 2026?: August 23–29, 2026, across the United States, Canada and Mexico. CVSA also runs unannounced one-day Brake Check events during the year, so the checklist above is worth running at every preventive maintenance interval — not just in August.
What is the focus area of Brake Safety Week 2026?: Brake drums and rotors. Inspectors will record the condition of drums and rotors in addition to the standard brake inspection — cracks, missing material, contamination and severe wear are the defects most likely to be cited.
What puts a truck out of service for brakes?: The most common triggers are brakes out of adjustment (20% or more defective brakes places the vehicle out of service), audible air leaks or failed leak tests, inoperative low-air warning, damaged hoses or tubing, and cracked or contaminated friction components including drums and rotors.
How do I check brake chamber pushrod stroke?: With the system at full pressure and wheels chocked, mark the pushrod at rest, have the service brake fully applied, and measure the travel. Compare against the adjustment limit stamped for the chamber size and type. Any brake at or beyond its limit needs immediate adjustment or component replacement.
Which parts should I stock before the inspection blitz?: The highest-turnover items during brake campaigns are brake chamber diaphragms and complete chambers, air dryer cartridges, compressor repair kits, governor and purge valves, hoses and caliper service kits — all available in the VADEN ORIGINAL catalogue with OE cross-references.
At what air pressure should the low-air warning light or buzzer come on during a pre-trip check?: With the ignition on, the low-air warning light or buzzer must activate before system pressure drops below about 60 psi, and the ABS malfunction lamp should cycle off once its self-check finishes. If the warning triggers later than that or fails to clear, treat it as a defect and have the system checked before the vehicle goes back on the road.
How fast should air pressure build up when I test the compressor?: With the engine running at operating RPM, pressure on a dual air system should build from 85 to 100 psi in about 45 seconds. A slower build-up usually points to a worn compressor, a leaking line, or a governor that isn't cutting in correctly, and should be diagnosed before the truck is dispatched.
What are normal governor cut-in and cut-out pressures on an air brake system?: The compressor should cut out at its specified pressure, typically 120 to 135 psi, and cut back in roughly 20 to 25 psi lower. Readings outside that range usually signal a governor or unloader problem, so always confirm the exact figures against the vehicle manufacturer's current service data.
How much air pressure loss is acceptable during a static leak test?: With the engine off and brakes released, pressure loss should not exceed about 2 psi per minute (3 psi for combination vehicles). With the service brake fully applied, the limit is roughly 3 psi per minute, or 4 psi for combinations. Anything beyond that points to a leak that needs to be traced and repaired.
At what pressure do the spring brakes automatically apply?: As air pressure is fanned down during testing, the tractor protection valve should close and the spring brakes should apply on their own somewhere in the 20 to 45 psi range. If they engage outside that window, the protection valve or spring brake modules should be inspected before the vehicle returns to service.