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Replacing both axles in a heavy-duty truck is often recommended if one axle is severely damaged or worn, as it ensures balanced performance and reliability. This approach can prevent future alignment issues and uneven wear on tires. However, if the other axle is in good condition, a full replacement may not be necessary, but a thorough inspection is advisable.

Truck brakes can fail due to various reasons, such as worn brake drums or shoes, air pressure issues in air brake systems, or malfunctioning brake components like slack adjusters or S-cams. Regular maintenance and inspections are vital to identify early signs of wear or damage, prevent brake failure, and ensure safety on the road.

The type of coolant for your truck depends on the manufacturer's specifications. Generally, heavy-duty trucks require a coolant that can handle high operating temperatures. Always consult the truck's manual or a professional to choose the correct coolant, as using the wrong type can lead to engine damage.

Yes, a stock Engine Control Module (ECM) in a heavy-duty truck can be tuned to enhance performance, fuel efficiency, or emissions compliance. However, it requires expertise to ensure compatibility and maintain engine integrity. Improper tuning can lead to engine damage, void warranties, and potentially violate emissions regulations, so professional consultation is advised.

The major problem in diesel engines often involves the fuel system, particularly issues with injectors or pumps, leading to poor performance or engine failure. Additionally, diesel engines can suffer from a build-up of soot and deposits, especially in the Diesel Particulate Filter (DPF), requiring regular maintenance and cleaning to maintain optimal engine efficiency and comply with emissions standards.

Signs of a bad AC compressor in a heavy-duty truck include a lack of cold air, unusual noises when the AC is running, or visible signs of damage or leaks around the compressor. The compressor is crucial for the AC system's functionality; if it fails, it affects the entire cooling process. A professional inspection can confirm compressor issues and recommend appropriate solutions.