Browse Publications Technical Papers 2003-01-3316
2003-10-19

Improvement of Friction Brake Lining Performance 2003-01-3316

In the past, many different remedies have been tried to eliminate the sources of annoying brake noise, e.g., replacing brake hardware, adding shims, resurfacing the rotors, etc. The composition of the brake linings was seldom considered, since asbestos-filled materials possess many characteristics important to low noise operation.
With the disappearance of asbestos from brake linings, many other materials were evaluated in order to maintain performance while keeping brake noise to a minimum. Fillers like calcium silicate, glass fiber, mica, etc. offer some similar performance characteristics to asbestos. Friction modifiers, such as metal oxides, metal sulfides, rubber scrap, etc are also used to maintain a more constant coefficient of friction during braking.
Among the metal sulfides, molybdenum disulfide (MoS2) is often used since it possesses very good dry lubricating properties. Graphite has similar dry lubricating properties, but exhibits poorer adhesion to metal surfaces and a coefficient of friction highly affected by humidity levels.
New surface treatment technology for graphite has resulted in significant improvements to the tribological performance of this material. These “polarized” graphite particles show very good adhesion to metal surfaces and a much greater resistance to changes in humidity. Using polarized graphite in brake lining formulations can substantially reduce their potential for being a source of brake noise. Several European brake pad manufacturers are now using this new technology, and their findings are presented.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Development of Disk Brake Rotor Utilizing Aluminum Metal Matrix Composite

970787

View Details

TECHNICAL PAPER

Development of Disc Brake Rotors for Heavy- and Medium-Duty Trucks with High Thermal Fatigue Strength

2003-01-3372

View Details

TECHNICAL PAPER

The role of raw material ingredients of brake linings on the formation of transfer film and friction characteristics

2001-01-3130

View Details

X