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.
RoadService.app lists providers. It does not set prices, quote jobs, or take payment for repair work — use these ranges as a reference and confirm the price directly with the shop you call.
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. Search RoadService.app for listed mobile brake providers, then call the provider directly to confirm capability and documentation requirements.
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.