Engine timing gears inside the front cover

Brake Repair

Air Brake Repair — Heavy-Duty Truck Brakes Done On-Site

Call (931) 561-7736 Request service

Based in Russellville, KY · 75-mile radius

Symptoms we look for

You hear

· Hissing air when sitting at idle
· Squealing under braking
· Grinding metal-on-metal under brake application

You see

· Air pressure dropping faster than it should
· Brake light staying on
· Chamber pushrod stroke past adjustment limit

You smell

· Burnt friction material
· Hot brake-shoe smell at the wheel-end

What we cover

Service brake chamber replacement (Type 24, 30, MGM, Bendix)
Spring brake chamber replacement
Slack adjuster replacement (automatic slack adjusters per OEM)
Brake drum replacement
Brake shoe and friction material replacement
Air system: compressor, governor, dryer, lines, fittings
ABS sensor and wire repair
Park brake and emergency-brake diagnosis

How we handle it

Brake work is a system, not a wheel. We diagnose the whole air system first — leak check at every chamber, pressure-build time, governor cut-in and cut-out, dryer cycling. Then the friction side: chamber stroke at each wheel, shoe thickness, drum measurement, slack adjuster condition. We tell you what's actually bad. If three of eight wheels are at adjustment limit and one is past, we'll fix all four on that side; we won't do a single-wheel job that puts you back on the road with three other wheels about to fail. We adjust to the OEM spec, not the FMCSA legal-minimum.

Parts & warranty

Bendix and Haldex on chambers and slacks — those are the brands the OEMs put on the truck. Drums from Webb or Gunite. Friction material that meets FMVSS 121. 1-year parts-and-labor warranty.

Related services

Other repairs

Coverage by city

Brake Repair on-site in the cities below. Each link goes to the per-city page with localized response details.

Request service

Request brake repair

Tell us what's going on and we'll call you back. For roadside emergencies, the fastest path is to call (931) 561-7736.

Real work, real shop

Frequently asked

How often should brake chambers be replaced?

Chambers don't have a fixed mileage interval — they fail by symptom. Pushrod stroke past adjustment limit, visible diaphragm damage, leaking around the clamp, or stroke that doesn't return cleanly. Most chambers go 4–6 years in over-the-road service.

Why does my air pressure drop overnight?

Either an air-system leak or a check-valve failure letting reservoir air escape backwards. We pressurize the system, isolate sections, and find it. Common culprits: trailer glad-hand seals, tractor protection valve, dryer purge valve, compressor governor.

How long does a full brake job per axle take?

Both wheels on a drive axle, including drums and shoes, typically 4–6 hours per axle. Steer axle is faster. We give you a firm number after we look.

Will my truck pass DOT inspection if a chamber is past stroke limit?

No. Pushrod stroke past adjustment limit is an out-of-service violation. We'll catch it during DOT inspection or routine brake service and fix it before it becomes a roadside ticket.

What customers say

4.7 / 5 from 43 Google reviews

“Brennan was great — absolutely hire this guy. I own a local tree company in Goodlettsville and one of my work trucks broke down at short notice. He was able to get there within a day or two and diagnose it. My turbo went out on one of my vehicles — when I went to the dealership they told me the wait time was forever and the process would include taking the cab off, which wouldn't work well with my current setup. Within one day he was able to replace my turbo and get it running so I could get back in business. The job was really labor-intensive but he made quick work of it and it runs even better than it did before. He's now the main guy I go to.”

— Tyler M.
“We've used Blacktop Mobile Repair twice this month, and both experiences have been nothing short of amazing. They run a top-notch operation, and it really shows in the quality of service and professionalism they provide. Jacob, the service tech, went above and beyond to make sure our truck was taken care of. He even drove out of his way to make sure he had the exact part needed to fix the truck and get us back on the road quickly. That level of dedication and commitment is hard to find. As a trucking company, downtime is costly, and having a team like Brennan and Jacob we can rely on makes all the difference.”

— Matthew P.
“I've used these guys in the past for an air compressor installation. Jacob was great. And recently my alternator quit on the weekend. I called Jacob on a Saturday and he helped me find one that I could pick up myself. Both times Jacob was knowledgeable & fair. A few months later — again on a Saturday — I wasn't even in their area and I called again to get troubleshooting advice. They are very good at diagnosing. Was able to pinpoint the trouble. Thanks again guys!”

— Dennis W.

Read all 43 reviews on Google