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['CMV Parts and Maintenance']
['Parts and Accessories - Motor Carrier', 'Tires']
11/08/2025
State Info
CMV parts and maintenance - Michigan
Michigan has adopted Part 393 of the Federal Motor Carrier Safety Regulations (FMCSRs).
Part 393 applies to an intrastate vehicle with a gross vehicle weight, gross vehicle weight rating, gross combination weight, or gross combination weight rating of 10,001 pounds or more (whichever is greater), or any size vehicle transporting a placardable amount of hazardous materials.
| Brakes | Brakes (Surge) - A combination of vehicles with an actual combination GVW or GCWR ≤ 26,000 lbs., provided the trailer or semitrailer has an actual GVW or GVWR ≤ 15,000 lbs., may be equipped with surge brakes for intrastate operation as allowed by 705(1)(c) of the Michigan Vehicle Code, 1949 PA 300, MCL 257.705. Vehicles of any size transporting a placardable amount of hazardous materials are prohibited from being equipped with surge brakes for intrastate operation. |
| First Aid Kit | No requirements |
| Mudflaps | A truck, truck tractor, semitrailer, or any combination of these, when used on a highway, must be constructed, equipped, or operated to prevent water or other road substances from being thrown from the rear wheels of the vehicle or combination at tangents exceeding 221/2 degrees measured from the road surface. If a flap device is used, it must not have attached any type of lamp, breakable reflective material, or reflecting buttons nor may the device extend beyond the maximum width of the vehicle or combination. |
| Tires | Tire Chains - Tire chains of reasonable size may be used on a vehicle when required for safety because of snow, ice, or other condition tending to cause a vehicle to skid. |
['CMV Parts and Maintenance']
['Parts and Accessories - Motor Carrier', 'Tires']
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