California roadside brake violations: what inspectors actually cite
California inspects more trucks than any other state, and brakes draw more vehicle violations there than any other system. FMCSA's own inspection records show which brake problems get written up, and which ones park the truck.
Written by Rigo Diaz
California brake inspections, 2025
California roadside brake violations in 2025 were led by out-of-adjustment brakes, then damaged air hoses and air leaks, according to FMCSA inspection data. ABS lamp faults made up 7%. California ran more inspections than any other state, and a brake violation there counts in FMCSA's safety scores and in CHP's choice of terminals to inspect.
California is where a truck is most likely to be inspected. In 2025, agencies in the state reported 439,718 commercial vehicle inspections, more than any other state, and brakes drew 36% of the vehicle violations they wrote, more than lights or tires.
I spent more than six years in risk management before I founded Simplex, and I have led it for more than 25 years. Our Rancho Cucamonga office works with California carriers. This guide uses FMCSA's own inspection records to show which brake problems California inspectors write up most, and why each one counts twice in this state.
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Key takeaways
Adjustment tops the list
Out-of-adjustment brakes and automatic adjusters that failed to compensate for wear drew 21,637 citations in California in 2025, about a quarter of all brake violations.
Hoses park the most trucks
Damaged, chafed, or loose air hoses and tubing caused 8,942 brake out-of-service violations, more than any other brake problem, including the 20% defective brakes rule.
ABS lamps are common but rarely fatal
ABS violations were 7% of brake citations, mostly the trailer's exterior lamp. Only 2 of 6,254 put a vehicle out of service, but each still counts in your safety score.
More inspections, not tougher ones
California reported 15% of all U.S. inspections in 2025, but its vehicle out-of-service rate was 15.5%, below the 22.3% national rate.
Violations count twice here
They feed FMCSA's Vehicle Maintenance BASIC, and CHP picks terminals to inspect from those same percentiles. A recent Level I report can even become part of your terminal inspection.
In this articleContents
Which California roadside brake violations are most common?
Out-of-adjustment brakes, followed closely by damaged air hoses and air leaks. We pulled every 2025 inspection reported by California from FMCSA's Vehicle Inspection File and matched it to the violation records. Inspectors cited 88,610 brake violations, which we grouped by problem:
| Problem | Violations cited | Out of service |
|---|---|---|
| Brakes out of adjustment, including automatic adjusters that fail to compensate for wear | 21,637 | 4 |
| Air hoses or tubing damaged, chafed, or not secured | 19,960 | 8,942 |
| Air leaks: connections, brake chambers, valves, tanks, or a failed air loss rate test | 18,459 | 2,273 |
| Other components: drums, linings, parking and breakaway brakes, reservoirs | 14,719 | 4,983 |
| 20% or more of the service brakes defective | 7,581 | 7,522 |
| ABS: malfunction lamps or a system fault | 6,254 | 2 |
Of the 361,259 California inspections that examined a vehicle (Levels I, II, and V), 14.1% found at least one brake violation and 5.4% put the vehicle out of service for brakes. Brakes were behind 35% of all inspections that ended with a vehicle out of service.
Is California stricter than other states?
Not by the numbers. California reported 439,718 inspections in 2025, 15% of the national total and far more than Texas, the next state, at 312,593. But only 15.5% of its vehicle inspections ended with a vehicle out of service, against 22.3% nationwide.
What sets California apart is exposure. CHP's Commercial Vehicle Section estimates commercial vehicles travel about 30 million miles a day in the state, so the same defect simply gets more chances to be seen. If your lanes include long downgrades, our mountain driving guide covers how grades wear on brakes.
Why are out-of-adjustment brakes the top citation?
Because pushrod stroke is measured on every brake during a full inspection, and it drifts as linings wear. The code for brakes past their readjustment limit, 49 CFR 393.47(e), was cited 15,139 times in California in 2025, more than any other vehicle violation of any kind.
Another 6,405 citations were for automatic adjusters that failed to compensate for wear. Air-braked vehicles built on or after October 20, 1994, must have automatic adjusters under 49 CFR 393.53, so an over-stroking brake on a newer truck is a sign the adjuster or the foundation brake needs repair.
A single out-of-adjustment brake almost never parks the truck: only 4 of these citations were out of service. They add up instead. When 20% or more of the service brakes on the vehicle or combination are defective, the truck is out of service, and that rule was applied 7,522 times. Our Brake Safety Week guide shows how to measure stroke the way inspectors do.
Why do air hoses and leaks put trucks out of service?
Because a hose worn into its reinforcement layer, or a leak the system can't keep up with, can empty the air brakes on the road. In California's 2025 data, hose and tubing damage into the outer reinforcement ply was cited 7,421 times, and 6,518 of those were out-of-service violations. Only leaking or badly underinflated tires and the 20% rule produced more out-of-service violations.
The rule is 49 CFR 393.45: brake hoses must be long and flexible enough for normal movement, secured against chafing and kinking, kept away from the exhaust, and connected without leaks or constrictions. Hoses that rub on a crossmember or hang loose between tractor and trailer are the usual cause.
Leaks are judged by where they are and how much air they lose. An audible leak at a proper connection was cited 7,556 times but led to an out-of-service order only 126 times. A leak somewhere other than a proper connection was out of service 1,300 times out of 2,326, and a failed air loss rate test 461 times out of 603. Leaks from brake chambers drew another 5,109 citations.
How to check air loss the way California teaches it
The DMV's California Commercial Driver Handbook sets these limits for a one-minute test. More loss than this means the brake system needs repair before the truck moves.
| Test | Single vehicle | Combination of 2 / 3 or more |
|---|---|---|
| Static: engine off, brakes released | 2 psi | 3 psi / 5 psi |
| Applied: engine off, foot brake held | 3 psi | 4 psi / 6 psi |
If the towed vehicles don't have air brakes, the handbook caps the combination at the single-vehicle limit: 2 psi static, 3 psi applied. While the brakes are applied, walk the truck and listen at every fitting, chamber, and glad hand.
How often are ABS warning lamps cited in California?
Less often than the other brake problems: 6,254 ABS violations in 2025, 7% of California's brake citations. Most were not about the tractor's dash. The trailer's exterior ABS malfunction lamp accounted for 3,853 of them, 62%.
Under 49 CFR 393.55, air-braked truck tractors built on or after March 1, 1997, and other air-braked vehicles built on or after March 1, 1998, must have antilock brakes. Trailers built on or after March 1, 1998, also need an exterior ABS malfunction lamp, which the DMV handbook places on the left side, at the front or rear corner.
The check takes seconds. On newer vehicles, the lamp comes on at start-up as a bulb check and then goes out. If it stays on, or comes on while you drive, the handbook says you may have lost ABS control at one or more wheels. In California's data, only 2 ABS citations put a vehicle out of service, but every one carries the same severity weight as an air leak in your safety score.
How does a roadside brake violation follow you in California?
It goes on two records: FMCSA's safety scores and CHP's list of terminals to inspect.
In FMCSA's safety scores
Brake violations count in the Vehicle Maintenance BASIC, one of the 7 BASICs. FMCSA's violation list gives the adjustment, hose, leak, and ABS codes above a severity weight of 4 each, and the SMS methodology sets the intervention threshold in that BASIC at the 80th percentile for most carriers.
In CHP's terminal inspections
CHP inspects motor carrier terminals under the Basic Inspection of Terminals (BIT) program, explained on our California DOT compliance page. According to CHP's BIT guide, terminals are selected by a California Performance Safety Score derived from your FMCSA BASIC percentiles, and carriers at or above the federal alert level generally have all their California terminals selected.
The same guide says CHP may use Level I roadside inspection reports from the 90 days before a terminal inspection as part of its vehicle sample. A brake violation written at a scale can end up in your terminal rating. Our Level I inspection checklist covers what that inspection includes.
For carriers based outside California
Interstate vehicles not based in California don't have to keep 90-day inspection records in the state. But under Vehicle Code 34505.5, if an inspection here points to a weak maintenance program, CHP may require you to produce your maintenance records within 10 working days.
How do you keep brake violations off California inspection reports?
Find them first. Every item in the table above can be seen, heard, or measured in your own yard.
Step 1: Run the 90-day inspection as a brake check
California requires the vehicles covered by BIT to be inspected at least every 90 days, including brake adjustment and brake system components and leaks, with records kept for two years. CHP says a Level I roadside inspection can't take the place of that inspection, so schedule it whatever your roadside history.
Step 2: Make the brake checks part of every pre-trip
Watch the ABS lamps at key-on, including the trailer's, run the air loss test, and trace each hose for rubbing or hanging loops. Our pre-trip inspection guide covers the rest of the walk-around.
Step 3: Fix wear, not just symptoms
An automatic adjuster that lets a brake over-stroke is a repair item, and so is a hose worn into its reinforcement ply. Route and secure replacement hoses so the same spot doesn't chafe again.
Step 4: Close out every inspection report
Within 15 days of an inspection, certify on the report that every violation was corrected, return it if the issuing agency asks, and keep a copy for 12 months, as 49 CFR 396.9 requires.
Step 5: Use CHP's free training
CHP's Commercial Industry Education Program offers free seminars for carriers on pre-trip and Level I inspection procedures, the out-of-service criteria, and BIT, at your facility or another agreed location.
How Simplex helps California fleets keep brakes off the report
Good brakes are a maintenance habit. Staying off CHP's and FMCSA's radar also takes records, monitoring, and someone watching the trend.
California and federal compliance
Our California DOT compliance team, based in Rancho Cucamonga, handles state requirements such as your CA number and motor carrier permit alongside federal compliance, with services from CSA monitoring to mock audits.
Watch your Vehicle Maintenance BASIC
Our CSA program team monitors your CSA data and helps fix the programs behind it, so brake violations don't push you toward an alert.
Documented maintenance
Our DOT safety compliance team sets up and maintains the programs FMCSA expects, including documented vehicle maintenance.
Frequently asked questions
What is the most common flaw found in roadside inspections of air brake systems?+
Is an ABS warning light an out-of-service violation in California?+
Does California use the CVSA out-of-service criteria?+
Does a Level I roadside inspection count as my 90-day inspection?+
Do out-of-state carriers need California 90-day inspection records?+
Where this information comes from
The data and rules below come from FMCSA's public inspection files, the California Vehicle Code, CHP, the California DMV, and federal regulations, checked on October 19, 2026.
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1
FMCSA — Vehicle Inspection File (DOT Data Hub)
2025 inspection counts by state, inspection level, and vehicle out-of-service totals.
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2
FMCSA — Vehicle Inspections and Violations (DOT Data Hub)
Violation codes and out-of-service flags for each California inspection.
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3
California Vehicle Code 34505.5
The 90-day inspection, its brake items, two-year records, and the 10-working-day rule for out-of-state vehicles.
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4
CHP — Welcome to BIT (CHP 800H)
Performance-based terminal selection, use of Level I reports, and why a Level I can't replace the 90-day inspection.
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5
California DMV — California Commercial Driver Handbook
Air loss limits for the static and applied leakage tests, and how ABS lamps behave.
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6
eCFR — 49 CFR 393.45
Brake hose installation, chafing, and leak-free connections.
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7
eCFR — 49 CFR 393.55
Antilock brake requirements and malfunction lamps by vehicle type and build date.
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8
FMCSA — SMS Methodology Appendix A
Severity weights for brake violation codes in the Vehicle Maintenance BASIC.
Written by
Rigo Diaz
Founder & CEO, Simplex Group
Founder and CEO of Simplex Group, with more than 25 years leading the company and helping trucking entrepreneurs navigate compliance, insurance, and the day-to-day demands of running a carrier. Before founding Simplex, he spent more than six years in risk management, experience that continues to shape how he approaches insurance, compliance, and carrier risk today.
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Find it before CHP does
Stroke, chafed hoses, leaks, and ABS lamps: every brake problem California inspectors cite most can be found in your own yard, and in California each one counts twice.
If you want help reviewing your maintenance records, your Vehicle Maintenance BASIC, or how ready your terminal is for CHP, talk to our team.