Browse Publications Technical Papers 2011-01-2348
2011-09-18

The Effect of Metal Pickup to the Friction Interfaces 2011-01-2348

Metal pickup is a phenomenon that can be observed during dynamic braking with automotive disc brakes. Hard metallic particle agglomerations embedded in the friction materials rubbing surface can lead to severe disc scoring, accelerated wear and deterioration of the friction surface of either brake disc or brake pad. Such kind of surface conditions are also suspected for generating brake squeal, even if a direct root cause effect had not been proven so far. Disc scoring effects have been reported for all kinds of applications, reaching from small passenger cars up to commercial vehicles as well as railroad brakes. Although such phenomena are known since long, they still appear causing problems in brake systems of today.
Some recent papers have described the effect and mentioned preferable conditions for the appearance of metal pickup. Specific procedures have been proposed for provocation of the effect to allow a better and more systematic investigation of the influencing parameters. Observations on results of such experiments were described and several working hypotheses put forward with influences going back to the brake rotors metallurgy and surface finish as well as to the friction materials ingredients.
This paper gives an overview to the actual situation of the research and developments about the effect of metal pickup generation. An investigation of a multitude of MPU cases from real car driving is used to cluster and structure the principal phenomena and discuss the various aspects. The discussion of the experimental results and the previous findings, lead to a new experimental set up which is proposed for further investigation and future works. This shall lead to a better way of investigating and understanding the influencing parameters within the brake system, rotor and brake lining for their effect to the phenomena.

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

Study of the Formulation Mechanism for Metal Pick-up on the Frictional Surface of a Disc Brake Pad

2008-01-2541

View Details

TECHNICAL PAPER

Phenomenological Approach to the Automotive Disc-Scoring Phenomena Related to Metal Pick Up Generation on Brake Pad Surface

2009-01-3021

View Details

TECHNICAL PAPER

Closer Look at Gray Iron Rotor Material to Understand Metal Pickup and Brake Noise Tendency

2015-01-2683

View Details

X