Product Code:SAE J360 Title:Truck and Bus Grade Parking Performance Test Procedure Issuing Committee:Truck And Bus Brake Systems Committee Scope:This SAE Recommended Practice establishes methods to determine grade parking performance with respect to:a.Ability of the parking brake system to lock the braked wheels.b.The vehicle holding or sliding on the grade, fully loaded or unloaded.c.Applied manual effort.d.Unburnished or burnished brake lining friction conditions.e.Down and up grade directions.