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Brake Pads, Lining, Disc, and Drum Wear Measurements
- Ground Vehicle Standard
- J2986_201901
- Issued
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This Recommended Practice provides a common method to measure wear of friction materials (brake pad assemblies and brake shoes) and their mating parts (brake disc or brake drum). These wear measurements apply to brakes fitted on passenger cars and light trucks up to 4536 kg of Gross Vehicle Weight Rating under the Federal Motor Vehicle Safety Standard (FMVSS), or vehicles category M1 (passenger cars up to nine occupants, including the driver) under the European Community’s ECE Regulations.
Rationale
Measuring mass and thickness loss of friction materials (brake pad assemblies and brake-lined shoes) and their mating parts (brake discs or brake drums) is a common practice during most inertia dynamometer and vehicle tests. Mass and thickness loss are some of the main criteria to assess the performance and behavior of the wearable brake components. This makes repeatable and reproducible wear measurements a must. This Recommended Practice presents the default measurement methods for the parts in the friction couple. SAE J2986 can be considered as a companion document to supplement laboratory or vehicle test and measurement programs.
The measurement methods presented in this Recommended Practice are useful to determine and report the mass and thickness properties (initial, intermediate, and final) of the friction couple or individual components. These measurements apply to brake parts preparation for mechanical testing, or other testing inducing wear or dimensional changes on the friction materials or their mating components.
Recommended Content
| Ground Vehicle Standard | Inertia Calculation for Single-Ended Inertia-Dynamometer Testing |
| Ground Vehicle Standard | Brake Rotor Thermal Cracking Procedure for Vehicles Below 4 540 kg GVWR |
Topic
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 |
Issuing Committee
Brake Dynamometer Standards Committee
The Brake Dynamometer Standards Committee is part of the Foundation Brake Steering Committee that reports to the Motor Vehicle Council. The committee is responsible for developing standards, recommended practices, and information reports for brake dynamometer testing, for on-road vehicles below 4540 kg of Gross Vehicle Weight Rating. The committee also maintains liaison activities with other Standard Development Organizations or industry consortia.
Reference
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