What We Fix
Chassis Repair.
Done Right.
We specialize exclusively in the mechanical chassis side of your RV — the systems that keep it moving safely. No living quarters, no appliances. Just serious mechanical work.
One Specialty. Done Better.
Most RV shops try to do everything. We don't. JS Mobile Repair focuses entirely on the chassis — engine, brakes, suspension, drivetrain, and electrical systems. That focus means faster diagnosis, better repairs, and a technician who has seen your exact problem dozens of times before.
We come to you anywhere in the Round Rock, TX area. No tow truck, no shop drop-off, no waiting weeks for an appointment.
Engine Repair & Diagnostics
From a check engine light to a full engine overhaul, we handle it all on-site. Our mobile unit carries professional-grade diagnostic equipment for gas and diesel chassis.
- OBD-II and advanced chassis diagnostics
- Tune-ups, spark plugs, and ignition systems
- Cooling system repair and flush
- Oil system service and leaks
- Gasket and seal replacement
- Major engine repair and rebuild consultation
Brake Systems
Your RV weighs tens of thousands of pounds. Brake failure is not an option. We inspect, service, and repair every component of your hydraulic brake system.
- Brake pad and shoe replacement
- Rotor and drum resurfacing or replacement
- Caliper service and replacement
- Brake fluid flush and bleed
- ABS system diagnostics
- Full hydraulic brake system inspection
Suspension & Steering
A worn suspension makes your RV dangerous to drive and hard on every other component. We restore ride stability and steering precision on all chassis types.
- Shock absorber and strut replacement
- Leaf spring and air bag service
- Ball joint and control arm replacement
- Tie rod and drag link service
- Steering gear and pump repair
- Alignment checks and referrals
Drivetrain & Transmission
Power delivery problems — slipping gears, vibration, or fluid leaks — are diagnosed and repaired on-site wherever possible.
- Transmission fluid service and filter
- Driveshaft and U-joint replacement
- Differential service and repair
- Transfer case service
- Axle seal and bearing replacement
- Transmission diagnostics and rebuild referrals
Electrical & Starting Systems
Chassis electrical problems can leave you stranded. We diagnose and repair the 12V systems that start your engine and keep it running.
- Battery testing and replacement
- Alternator and voltage regulator service
- Starter motor repair and replacement
- Chassis wiring diagnosis and repair
- Fuse panel and relay troubleshooting
- Parasitic draw diagnosis
Exhaust & Fuel Systems
Exhaust leaks and fuel delivery issues affect performance, safety, and emissions. We handle both systems on gas and diesel motorhome chassis.
- Exhaust leak detection and repair
- Muffler and pipe replacement
- Fuel pump testing and replacement
- Fuel filter service
- Fuel injector cleaning and diagnosis
- Diesel emissions system service
Ready to Get Rolling?
Call now or request service online. We serve Round Rock, TX and surrounding areas — we come to you.