Focus on Condition of Brake Lining, Pads During Brake Safety Week

Inspectors in Canada, Mexico and the U.S. conducted 18,875 motor vehicle inspections for the Commercial Vehicle Safety Alliance’s (CVSA) 2023 Brake Safety Week.

For the weeklong inspection and enforcement initiative, inspectors focused on the brake systems and components of commercial motor vehicles and submitted brake-related data to the Alliance. 

Brake-Related Out-of-Service Violations

Of the 18,875 total commercial motor vehicles inspected, 2,375 (12.6%) were removed from roadways because inspectors discovered brake-related out-of-service violations, such as broken brake drums, loose air tanks, corroded holes in a spring brake housing, inoperative tractor protection valves, and others.

Of the 2,375 vehicles that were placed out of service, 295 (12.4%) had steering axle brake violations, 1,127 (47.5%) had stand-alone brake violations and 1,394 (58.7%) failed the 20% defective brakes criterion, which states that a vehicle is out of service if the number of defective brakes is equal to or greater than 20% of the service brakes on the vehicle or combination.

Focusing on Brake Lining and Pad Issues

The focus of this year’s Brake Safety Week was on the condition of the brake lining and pad. Brake lining and pad issues may result in vehicle violations and could affect a motor carrier’s safety rating.

When inspecting the vehicle components of commercial motor vehicles, inspectors checked brake lining/pads for cracks, voids and contamination. They also looked for loose, missing or worn brake lining/pads. A total of 379 power (tractor) units and 261 towed (trailer) units had lining/pad violations.

Although lining/pad violations are not necessarily out-of-service violations, CVSA selected lining/pads as the focus for this year’s Brake Safety Week because brake lining/pad violations still affect a motor carrier’s safety rating. If left unaddressed, brake lining/pad violations may lead to more serious problems and can be out-of-service violations if they are on the steering axle or combined with other brake violations for the 20% brake criterion.

Performance-Based Brake Testers

Eleven states with performance-based brake testers (PBBT) participated in this year’s Brake Safety Week by conducting inspections using their PBBTs. A PBBT is a machine that assesses the braking performance of a vehicle.

Of the 397 PBBT inspections, there were 18 failures, which is a 4.5% out-of-service rate. Ninety-five vehicles passed with at least one wheel below the 43.5% threshold. U.S. federal regulations and the North American Standard Out-of-Service Criteria require a minimum braking efficiency of 43.5%.

10 Brake Lining and Pad Tips

Here are some tips from vehicle inspectors to help ensure brake linings and pads have no issues during a roadside inspection.

1. Inspect visible portions of the brake lining and pads as part of your pre- and post-trip inspections.
2. Look for signs of missing lining, such as grooves in the drum from rivet contact.
3. Look at the shoe-to-drum clearance and ensure there is adequate lining on the shoe.
4. Look for any signs of leaks from the hub or other components that may be contaminating the lining/pad surface.
5. Ensure there are no missing lining blocks.
6. Check for visible cracks or voids in the lining block.
7. Check for any exposed rivets or lining blocks that look loose on the shoe.
8. On disc brakes, pay particular attention to the condition of the rotor, such as heavily rusted rotors across the entire friction surface on either side or metalto-metal contact.
9. Make sure all repairs are consistent with the brake manufacturer’s requirements and guidelines.
10. Note any issues in your driver vehicle inspection reports and report them to the motor carrier to have the defective linings/pads repaired