Browse Publications Technical Papers 2006-01-3208
2006-10-08

Measurement of the Dynamic Center of Pressure of a Brake Pad During a Braking Operation 2006-01-3208

This paper discusses the analysis and measurement of the dynamic centre of pressure of a brake pad during a normal braking event. The technique is unique in its design and implementation. The process is progressive whereby the interface static measurements are first taken and then dynamic testing is carried out under braking. Two different measurement systems are considered during the analysis with one used to measure the center of pressure. Both the in-board and out-board pads are measured for wear but the piston pad was selected for pressure measurements. Validation of the spragging process is undertaken on both test rigs and vehicle trials. Pad wear measurements complement the collective information. The results show the position of the centre of pressure to vary considerably during a braking event, both radially and axially along the pad. The variable “instability envelope” is related to the caliper mounting geometry which is subsequently compared to the effective “spragging angle” and the generation of brake noise. It is seen that by careful selection of the backplate abutment friction level the centre of pressure may be controlled to always fall within the “stable envelope” region.

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.
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

Brake Pad Surface Topography Part II: Squeal Generation and Prevention

2005-01-3935

View Details

TECHNICAL PAPER

Brake Pad Surface Topography Part I: Contact Pressure Distribution

2005-01-3941

View Details

TECHNICAL PAPER

Surface Topography and Wear Dynamics of Brake Pads

2006-01-3202

View Details

X