Mack Truck Repair in Austin, TX
Vocational trucks that work for a living — dump, mixer, and refuse Macks get hard use, and we service them accordingly.
Mack service at an independent Austin shop
Macks around Austin are mostly working trucks: construction, waste, and heavy vocational units that see dust, weight, and short cycles. That duty cycle is hard on aftertreatment and suspension, which is where most of what we fix on them lives.
Mack models and drivetrains we service
- Anthem — Highway tractors with MP8 power and current emissions systems.
- Granite — Vocational dump, mixer, and construction trucks that live off pavement.
- Mack MP7 / MP8 — Engine diagnostics, EGR and turbo work, and aftertreatment faults.
- mDRIVE transmissions — Automated manual diagnosis, clutch actuator, and shift-quality complaints.
What we see fail on Mack
- Regeneration problems on short cycles — Vocational trucks that never get highway heat load their DPF and derate.
- EGR and turbo faults — Soot loading, coolant loss, and lost boost under load.
- Suspension and frame wear — Off-pavement duty is hard on bushings, air bags, and hangers.
- Air brake wear — Heavy vocational braking eats linings and finds air leaks fast.
- mDRIVE shift faults — Actuator and clutch issues that feel mechanical but are usually electronic.
Mack work we handle
- Mack MP7 and MP8 diagnostics and engine repair
- Aftertreatment service — DPF cleaning, DEF systems, and derates
- mDRIVE and driveline diagnosis and repair
- Air brake service and heavy vocational brake jobs
- Suspension, alignment, and frame-related repair
- Annual DOT/FMCSA inspections and fleet preventive maintenance
Modern Diesel is an independent, Christian, veteran-owned shop — we service Mack trucks but are not a dealer or affiliated with the manufacturer. Warranty coverage on our work is set with your service advisor at the time of service.
Related services
Other makes we service
Peterbilt · Kenworth · Freightliner · Volvo · International · Isuzu · Hino
Bring it to the shop
We work on Mack at our shop at 2900 N FM 973, Austin, TX 78725, serving the Greater Austin Area (Travis, Bastrop, Williamson, Hays) — Austin, Del Valle, Manor, Elgin, Pflugerville, Round Rock, and the surrounding counties. Call 512-717-2777 and tell us what it's doing, or send us the details and we'll get back to you.
Common questions
Our Macks run short routes and keep derating. Why?
Short, low-speed cycles never build enough exhaust heat to complete a regeneration, so soot accumulates until the truck derates. We clean and service the aftertreatment, check for an upstream cause like an injector or EGR fault, and can set up a maintenance interval that fits how the trucks actually run.
Do you service refuse and construction fleets?
Yes — waste and sanitation, construction, and heavy vocational fleets are a large part of our fleet work. That includes on-site service at your yard and priority scheduling when a route truck goes down.
Can you handle heavy vocational brake work?
Yes. Air brake systems, full brake jobs, drums and linings, and air-system leaks — plus the DOT inspection to certify it, all in the same visit.
Ready when you are.
Drop by the shop at 2900 N FM 973, Austin, TX 78725 or call and we’ll get you scheduled.