Brakes are consistently near the top of the list of reasons trucks get parked at roadside inspections, and the air system is behind a lot of them.
City driving is hard on brakes. Trucks working Little Rock and North Little Rock spend their days stopping and starting — delivery routes, construction sites, the ramps and merges around the I-30/I-40 interchange — and that wears shoes and drums and exposes every weak slack adjuster. Arkansas humidity also loads the air system with moisture, which works an air dryer hard and corrodes valves and fittings over time.
We come to the truck to find the leak, replace what failed, and make sure the system builds, holds, and releases air the way it should.
Our Air Brake Service: what the mechanic handles
- Finding and fixing air leaks at lines, fittings, valves, and tanks
- Gladhand seals and gladhand replacement
- Trailer air lines — red emergency and blue service — and line hangers
- Brake chamber replacement, including spring brake chambers
- Slack adjuster inspection and replacement, plus pushrod stroke checks
- Brake shoe and drum inspection, and replacement where access allows
- S-cams, cam bushings, and brake hardware
- Air dryer and purge valve service, including desiccant cartridge replacement
- Governor testing and replacement
- Air compressor diagnosis — slow build-up, oil in the system, or no air
- Relay, quick release, tractor protection, and foot valve leaks
- Draining tanks and checking for oil or water contamination
- ABS lamps and wheel speed sensor faults on tractors and trailers
Jobs that belong in a shop
- Compressor replacement on engines where it means pulling major components — doable on some trucks, a shop job on others
- Brake jobs on wheel ends with seized hardware or damaged hubs that need heavy teardown
- Drum machining
- Full brake overhauls on several axles at once, which are more efficient in a shop
Don’t cage a spring brake to move a truck unless you’re trained to and sure you still have enough braking. Caging disables that brake.
Fix it on site or tow it?
Most air brake problems get fixed on site: leaking lines and fittings, gladhands, chambers, slack adjusters, air dryers, and valves are routine mobile work. A truck that can’t release its brakes because of a leak is often repaired and driving away on the same visit.
A tow is the better choice when a wheel end is badly damaged, when the compressor failed on an engine where roadside replacement isn’t practical, or when a brake failure caused other damage. Never drive a truck with a known air system failure that affects braking.
What to tell dispatch
Give us these details on the first call so the mechanic shows up with the right parts and finishes in one trip.
- Whether the low-air warning is on, and what pressure the gauges show
- Whether the brakes won’t release, won’t apply, or are dragging
- Where you hear the leak — tractor or trailer, front or back — and whether it leaks with the brakes applied or released
- Whether it started right after hooking a trailer
- If the truck was put out of service, the violations on the inspection report
Trucks & engines we service
- Freightliner
- Peterbilt
- Kenworth
- Volvo
- Mack
- International
- Western Star
Class 6 through Class 8 trucks, with engines from Cummins, Detroit Diesel, PACCAR, Volvo, Mack, Navistar, and Caterpillar.
Air Brake Service across Little Rock & Central Arkansas
Air brake calls come from yards and drop lots where trailers get hooked and dropped all day, from the Galloway truck stops, and from the weigh stations on I-40 near Lonoke and I-57 near Jacksonville, where inspections turn up brake adjustment and air leak problems.
Interstates we cover
Cities we cover
Air Brake Service FAQ
How do I find my air leak?
Listen with the engine off. A leak with the brakes released points to the supply side — lines, tanks, and valves. A leak only with the brakes applied points to service chambers, the foot valve, or relay valves. Our air leak guide walks through it.
Why won’t my trailer brakes release?
Usually low air from a leak, damaged or crossed gladhand connections, a failed spring brake chamber, or a problem with the trailer’s relay emergency valve. On the rare hard freeze, ice in a line or valve can do it too.
What does “brake out of adjustment” mean?
Each chamber size has a maximum allowed pushrod stroke. Past that limit, the brake loses effectiveness. Automatic slack adjusters are supposed to prevent it, so an out-of-adjustment brake usually means a slack or foundation brake part needs attention.
Should I adjust automatic slacks by hand?
Routinely hand-adjusting automatic slack adjusters hides the real problem. If one keeps going out of adjustment, the brake should be inspected to find out why.
Is water in my air tanks a problem?
Some moisture is normal, especially in humid weather, but a lot of water means the air dryer isn’t doing its job. Oil in the tanks suggests the compressor is passing oil. Both damage valves and seals over time.
Can you fix brakes so an out-of-service truck can move?
Brake-related out-of-service defects can often be repaired where the truck was stopped. Keep the inspection report handy and ask for an itemized repair record.