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Diagnosis of Off-Brake Performance Issues with Low Range Pressure Distribution Sensors
Technical Paper
2010-01-0073
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Brake caliper and corner behavior in the off-brake condition can lead, at times, to brake system performance issues such as residual drag (and related issues such as pulsation, judder, and loss of fuel economy), and caliper pryback during aggressive driving maneuvers. The dynamics in the brake corner can be strikingly complex, with numerous friction interfaces, rubber component and grease dynamics, deflections of multiple components, and significant dependence on usage conditions. Displacements of moving parts are usually small, and the residual forces in the caliper interfaces involved are also small in comparison with other forces acting on the same components, making direct observation very difficult.
The present work attempts to illuminate off-brake behavior in two different conditions - residual drag and pryback - through the use of low-range pressure distribution sensors placed in between the caliper (pistons and fingers) and the brake pad pressure plates. Data from multiple sources, including dynamometer, straight-line in-vehicle, and hard cornering are presented and methods of analysis are discussed.
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Authors
Citation
Antanaitis, D., "Diagnosis of Off-Brake Performance Issues with Low Range Pressure Distribution Sensors," SAE Technical Paper 2010-01-0073, 2010, https://doi.org/10.4271/2010-01-0073.Also In
References
- Hoffman, C.T. Jr. Beurmann, D.J. “Measurement and Reduction of On-Road Brake Drag,” SAE Technical Paper 790723 1979
- Aoki, K. Kimura, T. Maeda, M. “Development of a Low Drag Disc Brake System for Small Cars - AD Disc,” SAE Technical Paper 800781 1980
- Weber, S.J. Shevket, C.R. “Eliminating Caliper Piston Knock Back in High Performance Vehicles,” SAE Technical Paper 2006-01-3197 2006
- Antanaitis, D. “Diagnosing Brake System Compliance Issues on the Race Track with System Modeling and the Mahalanobis-Taguchi System,” SAE Technical Paper 2007-01-0588 2007