This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Truck Brake Block Swell, Growth, and Thermal Instability
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1990 by SAE International in United States
Annotation ability available
All friction materials swell. That is, they temporarily increase in thickness with an increase in temperature. Brake block swell is usually greatest the first time the brake heats them above 150°C (about 300°F). Block growth also involves a change of thickness from heating. But growth is permanent. It is determined by measurements taken at ambient temperature, before and after the block is heated.
This paper introduces and defines several types of truck brake block thermal instability, and describes their effects on brake performance. Methods to measure thermal instability of brake blocks are described. Data are presented for several original equipment manufacturer (OEM) and aftermarket brake blocks.
Information is given on the ways truck brake block thermal instabilities may affect brake performance and durability. Through better awareness and understanding of these thermal effects, better brake performance can be achieved with OEM and replacement brake blocks.
CitationAnderson, A., "Truck Brake Block Swell, Growth, and Thermal Instability," SAE Technical Paper 902248, 1990, https://doi.org/10.4271/902248.
- Swell, Growth, and Dimensional Stability Recommended Practice SAE J160 JUN80, SAE Handbook 2 22 66
- Meadows, D. M. Johnson, W. D. Allen, J. B. Generation of Surface Contours by Moire' Patterns Applied Optics 9 942 1970
- Anderson, A. E. Knapp, R. A. Hot Spotting in Automotive Friction Systems Wear 135 1990 319 337
- Dwyer, John J. Jr. Fleet Owner Magazine Dec. 1988 20 Apr. 1989 40
- 1990 SAE Truck and Bus Meeting, Session 18C2 “New S-Cam Brakes.”
- Asbestos: Manufacture, Importation, Processing, and Distribution in Commerce Prohibitions Final Rule, Federal Register 54 132 Wednesday July 12 1989 29460 29513