Structural Testing of Passenger Car and Truck Disc Brakes
This SAE Recommended Practices specifies a procedure for determining structural strength and fatigue life of disc-brake caliper assemblies which are satisfactory for vehicle usage. It is applicable to new caliper assemblies which are employed in passenger car and truck brake systems utilizing hydraulic brake fluids. Brake design and vehicle performance requirements are not included. Specification limits are left to the discretion of the responsible manufacturer.
This procedure was developed for base brake operation and does not consider some unusual effects of ABS (Anti-Lock-Brake System) or Traction Control systems which may have a significant effect on the caliper. Careful analysis of the particular type ABS and/or Traction Control should be made and additional tests may be required which are not included in this document.
Rationale: 200 °C exposure for 10 hours could reduce the fatigue life for some aluminum alloys, which is the intent of this test section. Since 200 °C is above the wet boiling point of brake fluids it is unlikely the complete housing will see temperatures this high but the areas of housings in close proximity to the rotor could experience such temperatures. Applying this baking process to the entire housing is a practical method and could be considered slightly conservative.