Brakes are the one system on a school bus that nobody argues about. A bus with a soft pedal, an air leak or a brake out of adjustment doesn't go out, and every state inspection looks at them first. But brake checks happen at three different levels, by three different people, on three different clocks, and that's where they slip: the driver checks every morning, the shop inspects every so many miles, and the state has its own date.
Here's a school bus brake inspection schedule that covers all three, what each one looks at, and how to make sure none of them is missed.
Three levels of brake checks
| Who | How often | What it covers |
|---|---|---|
| The driver | Every pre-trip, every day the bus runs | Pedal feel, parking brake, air pressure build-up, leaks, the low-air warning, a rolling brake test |
| Your shop | By miles or months, whichever comes first | Linings and drums or pads and rotors, slack adjusters and pushrod stroke, hoses and lines, air dryer, ABS warning |
| The state | On the state's schedule (yearly, twice a year or by miles) | Its own brake items and the paperwork that shows your shop did its part |
The driver's daily brake check
On an air-brake bus, the CDL manual's air brake check is the core of it. The numbers below are the usual ones from the CDL manual. Follow your own state's manual and the bus maker's figures where they differ.
- Air builds up from about 85 to 100 psi within 45 seconds on a dual air system, at fast idle.
- Leak-down with the engine off: no more than 2 psi lost in a minute with the brakes released, 3 psi with the service brake held, on a single vehicle.
- The low-air warning comes on before the pressure drops below 60 psi.
- The spring brakes come on by themselves between about 20 and 45 psi.
- The parking brake holds the bus in gear against a gentle pull.
- A rolling test at a walking pace: the bus stops straight, with no pull and no soft pedal.
On a hydraulic-brake bus, the driver checks that the pedal is firm and doesn't sink when held, the brake warning light is off, and the bus stops straight. Any failed brake item means the bus doesn't go out until a mechanic has seen it. Our pre-trip inspection guide has the full walk-around.
The shop's brake inspection
Your shop's inspection goes deeper than any pre-trip: wheels or inspection ports, linings, drums or rotors, slack adjusters and pushrod stroke, chambers, hoses, the air dryer and the ABS. Most fleets do it on a mileage interval with a time limit for buses that don't run far. Stop-and-go school routes are hard on brakes, so many shops use shorter intervals than a highway fleet would.
Tip: Set the interval by miles and months. A spare bus that runs 3,000 miles a year still needs its brakes looked at, and it won't reach a 10,000-mile mark for three years.
State brake rules
Every state inspects school buses, and the brakes are always on the list. Some states also set a brake schedule of their own. Illinois, for example, asks for a brake inspection on each school bus every 10,000 miles or once a year, whichever comes first, separate from its regular safety tests, with a signed brake inspection report and the mileage on file. Check your state's rules, and our free state inspection requirements pages for where to find them.
Good to know: Brake rules depend on your state, your bus maker and your insurer. Use the official numbers for your buses and your state; the figures here are common examples, not a standard.
A schedule you can adapt
- Every day: the driver's brake checks on the pre-trip, with any failure written up and the bus held.
- Every 10,000 miles or 12 months, whichever comes first: a full brake inspection by the shop, with the mileage written down. Shorten it for buses on heavy stop-and-go routes.
- At every oil change or PM service: a quick look at the linings, adjustment and hoses while the bus is up.
- When the state says: the state inspection, with your shop's brake records ready.
Doing it in FleetCommander
The shop's schedule. Under Maintenance, add a schedule for each bus with the Brake inspection preset (every 10,000 miles), and add Every (days) too, say 365, so a bus that doesn't run far is still due on time. Whichever comes first makes it due. Every (engine hours) is there if your shop goes by hours. Overdue maintenance and Preventive maintenance compliance under Reports show what's due and how well each bus keeps up.
The driver's daily check. On your pre-trip template under Inspections › Templates, list the brake items and tick Safety-critical on each. When a driver marks one not OK on My Day, the inspection fails, a defect is opened, managers are told, and the bus can be taken out of service. A Critical brake defect keeps the bus out of service until it's resolved. See the Inspections guide and the Maintenance guide.
Ava (Beta), the assistant in the app, answers What maintenance is overdue? or Any open defects?. More on her page.
Related reading
Questions people ask
- How often should school bus brakes be inspected?
- The driver checks them on every pre-trip. A shop inspection is commonly done every 10,000 miles or once a year, whichever comes first, and the state inspects on its own schedule. Your state and bus maker may set different numbers.
- What is the air brake leak-down limit for a school bus?
- The CDL manual's usual figures for a single vehicle are no more than 2 psi lost in a minute with the brakes released and 3 psi with the service brake applied. Use your state's CDL manual for the exact numbers.
- Can a bus go out with a failed brake item?
- No. A failed brake check should keep the bus in the yard until a mechanic has looked at it and the defect is fixed.
- Do states have their own brake inspection rules?
- Some do. Illinois, for example, asks for a brake inspection every 10,000 miles or yearly, whichever comes first. Check your own state's school bus rules.