Brake Pads | Brake Service

New vehicles must meet federal performance standards—a minimum stopping distance in various situations under a specified pedal effort. Many consumers assume all aftermarket replacement pads will perform as well or better than factory parts, but that's not always the case.

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To enhance customer comfort and preempt potential government regulations, brake manufacturers can test and verify their products under two voluntary certification standards. Both aim to ensure that replacement brakes are as effective as original equipment. Consumers should make sure that any pads installed on their vehicles are certified.

The first voluntary certification standard is an independent proprietary program developed by Greening Testing Laboratories in Detroit called D3EA—Dual Dynamometer Differential Effectiveness Analysis. This procedure tests front and rear friction materials together on dual dynamometers, then simulates vehicle weight and speed through a computer program to measure braking effectiveness and balance for different applications. D3EA was introduced in 1996, and among the first aftermarket companies to achieve D3EA certification were ACDelco, NAPA, Raybestos, and Satisfied.

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The Brake Manufacturers Council (BMC) offers a second certification standard called BEEP, or Brake Effectiveness Evaluation Procedure. BEEP testing is conducted on a single dynamometer, and the results are processed through a computer program to compare brake performance with federal standards for new vehicles. BEEP approval seals appear on packaging as manufacturers submit products for certification.

The D3EA tests are proprietary and more expensive, but they are also completely independent and tougher to pass. Some brake manufacturers argue that most consumers change only the front or rear brakes at one time, so a dual test is unnecessary. However, according to Greening officials, NHTSA tests in the 1980s showed a significant reduction in braking performance when there was a difference between front and rear replacement pads compared to original factory parts. This report contributed to the brake industry's motivation to seek a certification standard before federal government regulation was imposed. The concern with BEEP testing is that manufacturers themselves oversaw the development of the certification standards. While the program received input from the Society of Automotive Engineers and actual certification is conducted at an independent laboratory, BMC members can conduct similar tests on their own single dynamometers and process the results.

Consumers should remember that certification doesn't apply to an entire aftermarket manufacturer's lineup but only to pads designed for specific vehicles that have passed the designated test. Additionally, because D3EA tests are costly, manufacturers may only test the standard line for a particular vehicle. Therefore, any upgraded line from that same manufacturer is expected to meet the same test standards. This is why heavy-duty or new ceramic pads might not carry the seal. The best advice is to look for manufacturers that rigorously test their standard line, then upgrade if more performance is needed or other advantages, such as minimal wheel dust, are desired.

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