Technical Service Bulletin SB21-H-001 — 2018 ISUZU F-SERIES

ISUZU COMMERCIAL TRUCK OF AMERICA, INC. IS PROVIDING THIS BULLETIN TO REMIND DEALERS TO STRICTLY FOLLOW THE PROCEDURES SET FORTH IN THE APPLICABLE SERVICE MANUAL WHEN CONDUCTING SLACK ADJUSTER AND OTHER BRAKE COMPONENT MAINTENANCE AND INSPECTIONS (TO BE PERFORMED EVERY 10,000 MILES OR 6 MONTHS, WHICHEVER COMES FIRST). THE SLACK ADJUSTERS (FITURE 1) AND CAMSHAFTS (FIGURE 2) MUST BE GREASED AND THE BRAKE STROKE (FIGURE 3) AND CAMSHAFT RADICAL PLAY (FIGURE 4) SHOULD BE CHECKED AT EACH/EVERY MAINTENANCE. DELAYING OR SKIPPING BRAKE MAINTENANCE AND INSPECTIONS CAN LEAD TO ACCELREATED BRAKE COMPONENT WEAR AND DAMAGE, AND ADVERSELY AFFECT THE PERFORMANCE OF THE VEHICLE'S BRAKING SYSTEM. IF A DEALER RECEIVES A CUSTOMER COMPLAINT RELATED TO POOR OR ABNORMAL BRAKING PERFORMANCE IN AN AFFECTED VEHICLE, THE ENTIRE BRAKE SYSTEM MUST BE INSPECTED FOR PROPER FUNCTIONALITY. IT IS IMPORTANT FOR THE TECHNICIAN TO UNDERSTAND THAT THE SLACK ADJUSTERS ARE NOT DESIGNED TO COMPENSATE FOR DAMAGED OR EXCESSIVELY WORN BRAKE COMPONENTS. IN ORDER TO AID TECHNICIANS IN DIAGNOSING EXCESSIVE BREAK STROKE-RELATED BRAKE PROBLEMS, WE ARE PROVIDING THE SERVICE PROCEDURES BELOW.