Brake Repair Cost for Semi Trucks — What Roadside Fixes Cost
Air brake issues are among the most common — and most safety-critical — roadside failures for heavy-duty trucks. Here's what repairs cost, from a quick air-leak fix to a full brake job.
If an eligible provider responds, RoadService.app shows the customer-facing all-in total — including the RoadService job fee when applicable — before you accept.
Typical cost ranges
Ranges reflect 2026 US market rates. Actual costs vary by region, time of day, parts availability, and make/model.
| Repair / service | Low estimate | High estimate |
|---|---|---|
| Air leak fix (line / fitting / valve) Most common roadside brake repair; fast mobile fix in most cases. | $150 | $400 |
| Glad-hand seal replacement Quick repair; air leaks between tractor and trailer are often a glad-hand issue. | $50 | $150 |
| Slack adjuster replacement (per axle) Automatic slack adjusters are DOT-required; manual adjustments are inspected at every DOT stop. | $200 | $500 |
| Brake shoe replacement (per axle) Mobile if the truck can be positioned safely; shop preferred for full axle work. | $300 | $700 |
| Brake drum replacement (per drum) Drums crack and heat-check with hard use; scored drums must be replaced. | $200 | $500 |
| Full brake job (all axles, shop) Complete axle-by-axle brake service including drums, shoes, hardware. | $2,500 | $6,000 |
| ABS module / sensor replacement ABS faults flag at DOT inspections; mobile or shop fix depending on severity. | $300 | $800 |
What affects the price?
A DOT roadside inspection with an air leak or out-of-adjustment brake will put you out of service. A mobile brake tech can fix qualifying violations and document the repair.
Most Class 8 trucks run air brakes — parts are widely available and most mobile techs carry common brake components.
Mountain and high-heat routes wear brakes faster. Inspect and adjust more frequently in these conditions.
An audible air leak caught at a fuel stop is a $200 roadside fix. The same leak ignored until brake fade or lockup can cause an accident.
FAQ — semi truck brake repair cost
A simple air leak or glad-hand fix runs $100–$400. Slack adjuster and brake-shoe work runs $300–$700 per axle. A full brake job at a shop runs $2,500–$6,000 for the full truck.
Yes — air leaks, fittings, glad-hands, slack adjusters, and basic ABS faults are routinely fixed by mobile heavy-duty techs. Major brake jobs are safer in a shop.
A mobile brake tech can repair qualifying defects (air leaks, brake adjustment, ABS faults, lights) and provide documentation to clear an out-of-service order. Request through RoadService.app.
Find providers in the directory
Cost estimates reflect 2026 US market averages and do not constitute a quote. Actual prices depend on your location, vehicle make/model, fault severity, time of day, and provider rates. Always get an itemized quote before work starts.