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SAE J225 2003 Edition, April 1, 2003
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Brake Force Distribution Field Test Procedure for Truck and Bus
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AIA/NAS Aerospace Standards
This SAE Recommended Practice provides a field test procedure and instructions for:

a. Instrumentation and Equipment

b. Vehicle Preparation

c. Test of air-braked single and combination vehicles

d. Calculation of brake force distribution

e. This test procedure is intended to be used as a field procedure. If a more refined method, utilizing laboratory equipment, is required, refer to SAE J1505.

Purpose - This procedure provides a method to determine the brake force distribution (brake system effectiveness) for trucks and buses with a GVWR greater than 4536 kg (10 000 lb).