Technician A says that truck brake shoe edge codes are used as an exact measure of their coefficient of friction.Technician B says that the first letter of an edge code indicates the coefficient of friction of the friction facing when cold.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Brake Shoe Edge Codes

Markings found on the edge of brake shoes indicating manufacturer, specifications, and other pertinent information for identification and matching purposes.

Coefficient of Friction

A dimensionless number representing the ratio of the force of friction between two bodies and the force pressing them together.

Friction Facing

A material attached to surfaces, such as clutches or brake pads, that enhances friction between moving parts, thereby improving grip and reducing slippage.