This SAE Recommended Practice establishes a uniform procedure for a flat-road simulation of a mountain-fade test of the brake systems of light-duty trucks and multipurpose passenger vehicles up to and including 4500 kg (10 000 lb) GVW and all classes of passenger cars. The purpose of this test code is to establish brake system characteristics while simulating a mountain descent. This procedure is intended to be used to evaluate the following characteristics of a brake system: a. Brake temperature relative to fluid boil b. Fade resistance and reserve pedal travel c. Overall structural durability d. Subjective stability
This document has been determined to contain basic and stable technology which is not dynamic in nature. This standard and industry users have been recently reviewed by Road Test Procedures committee. The industry has no requests for changes to SAE J1247 procedure and general practice utilizes other methods to simulate mountain descent brake performance.