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Semi-trucks are heavy-duty vehicles that require high-quality brakes to ensure safe driving. The brake system of a semi-truck consists of several components, and brake shoes are among the most crucial parts. Brake shoes are responsible for pressing against the brake drum to slow down or stop the vehicle. Over time, brake shoes wear out, and it becomes necessary to replace them. In this article, you’ll learn how to measure semi-truck brake shoes to determine if they need replacement.
What You’ll Need
Before you start measuring your semi-truck brake shoes, you’ll need a few tools. These include:
Measuring Caliper
A measuring caliper is a tool used to measure distances between two opposite sides of an object.
Vernier Caliper
A vernier caliper is a more advanced type of measuring caliper that is used to measure internal and external distances with high accuracy.
Brake Shoe Gauge
A brake shoe gauge is a tool used to measure the thickness of the brake lining. It consists of a metal plate with a groove that fits over the lining.
Step-by-Step Guide
Here are the steps to follow when measuring semi-truck brake shoes:
Step 1: Jack Up the Truck
To access the brake shoes, you need to jack up the truck and secure it on jack stands. Make sure the truck is on a level surface and the wheels are chocked to prevent it from rolling.
Step 2: Remove the Brake Drum
Use a screwdriver or a hammer to remove the retaining clips and then remove the brake drum.
Step 3: Measure the Width of the Brake Shoe
Use the measuring caliper to measure the width of the brake shoe. Place the caliper on the shoe lining and take the measurement. The width of the brake shoe should be within the manufacturer’s specifications.
Step 4: Measure the Thickness of the Brake Shoe
Use the brake shoe gauge to measure the thickness of the brake lining. Place the gauge over the lining and take the measurement. If the thickness is less than the manufacturer’s specifications, the brake shoe needs replacement.
Step 5: Check for Cracks or Damage
Inspect the brake shoe for any cracks, chips, or other forms of damage. If you find any, replace the brake shoe immediately.
Step 6: Check the Brake Drum
Use the vernier caliper to measure the diameter of the brake drum. Make sure the diameter is within the manufacturer’s specifications.
Step 7: Reassemble the Brake System
Once you’ve checked the brake shoes and drum, reassemble the brake system. Put the brake drum back in place and secure it with the retaining clips.
People Also Ask
Q: How often should I replace my semi-truck brake shoes? A: Brake shoes should be replaced every 200,000 miles or when the lining thickness is less than 1/4 inch.
Q: Can I replace my own brake shoes on my semi-truck? A: It’s recommended to have a professional mechanic replace your brake shoes.
Q: How do I know if my semi-truck brake shoes are worn out? A: You’ll notice reduced braking performance, a grinding noise, or vibration in the brake pedal when the brake shoes are worn out.
