Browse Publications Technical Papers 2015-01-2667
2015-09-27

Further Research into the Role of the Caliper Piston in Brake Roughness 2015-01-2667

Previously published research [1] covering the role of piston material properties in brake torque variation sensitivity and roughness concluded that phenolic pistons have significantly higher low-pressure range compliance than steel pistons, which promotes lower roughness propensity. It also determined that this property could be successfully characterized using a modern generation of direct-acting servo hydraulically actuated brake component compression test stands.
This paper covers a subsequent block of research into the role of the caliper piston in brake torque variation sensitivity (BTV sensitivity) and thermal roughness of a brake corner. It includes measurements of hydraulic stiffness of pistons in a “wet” fixture, both with and without a brake pad and multi-layer bonded noise shim. Inertia dynamometer measurements of BTV sensitivity against a machined 20-micron thickness variation rotor with multiple (prototype) phenolic piston geometries, as well as steel pistons with two different piston to bore clearance levels followed. Finally, higher-temperature thermal roughness testing of multiple phenolic piston geometries and steel pistons with tighter and looser piston to bore clearances were run.
The results of these studies give some insight into the role of the caliper piston - its material properties, geometry, and clearance to the bore - in brake roughness and performance.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
We also recommend:
JOURNAL ARTICLE

Characterization of Caliper Piston Material Stiffness and Damping

2013-01-2050

View Details

TECHNICAL PAPER

Molding Advancements for Phenolic Automotive Components

2000-01-1164

View Details

JOURNAL ARTICLE

Effect of Phenolic Brake Piston Tribology on Brake Pedal Feel

2013-01-2051

View Details

X