| GMW14920 |
Note: Nothing in this standard supercedes
applicable laws and regulations.
Note: In the event of conflict between the
English and domestic language, the English language shall take
precedence.
Purpose. To objectively determine the brake
induced yaw response of a vehicle under moderate and extreme
Antilock Brake System (ABS) active braking conditions.
Foreword. This procedure is intended to
quantify the conditions commonly referred to as brake pull or lead,
and directional instability caused by braking. The test procedure
is designed to quantify the directional response of the vehicle to
inputs from the foundation brakes and antilock brake system with no
steering input. The procedure has two (2) sections: the constant
deceleration test used for foundation brake evaluation and the
maximum deceleration test for antilock equipped vehicles.
Applicability. The constant deceleration
portion of the test is applicable at all permissible loading
conditions to all passenger cars and light trucks up to 3500 kg
Gross Vehicle Mass (GVM). The maximum deceleration portion of the
test is applicable at all permissible loading conditions to
passenger cars and light trucks up to 3500 kg GVM equipped with
four wheel antilock brake systems. Trucks with GVM greater than
3500 kg may use this procedure, but reduced test speeds may be
necessary.
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