ISO 7975:2019
Passenger cars — Braking in a turn — Open-loop test method
This document specifies an open-loop test procedure to examine the effect of braking on course holding and directional behaviour of a vehicle. Specifically, the method determines how the steady-state circular response of a vehicle is altered by a braking action only. This document is applicable to passenger cars as defined in ISO 3833 and to light trucks.
The open-loop manoeuvre specified in this test method is not representative of real driving conditions but is useful to obtain measures of vehicle braking behaviour resulting from control inputs under closely controlled test conditions.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Variables
5.1 Reference system
5.2 Variables to be measured
6 Measuring equipment
6.1 Description
6.2 Transducers and their installation
6.3 Data processing
7 Test conditions
8 Test methods
8.1 Run-in program for newly installed brakes (pads/shoes)
8.2 Warm-up
8.3 Brake temperature
8.4 Initial driving condition
8.5 Performance of the braking procedure
8.6 General test description
9 Data evaluation and presentation of results
9.1 General
9.2 Time histories
9.3 Braking action
9.3.1 Reference point in time, t0
9.3.2 Definition of times and requirements for standard evaluation
9.3.3 Mean longitudinal acceleration, 
9.3.4 Mean longitudinal acceleration, , until time tn
9.4 Evaluation of characteristic values
Annex A (normative) Presentation of results
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Variables
5.1 Reference system
5.2 Variables to be measured
6 Measuring equipment
6.1 Description
6.2 Transducers and their installation
6.3 Data processing
7 Test conditions
8 Test methods
8.1 Run-in program for newly installed brakes (pads/shoes)
8.2 Warm-up
8.3 Brake temperature
8.4 Initial driving condition
8.5 Performance of the braking procedure
8.6 General test description
9 Data evaluation and presentation of results
9.1 General
9.2 Time histories
9.3 Braking action
9.3.1 Reference point in time, t0
9.3.2 Definition of times and requirements for standard evaluation
9.3.3 Mean longitudinal acceleration, 
9.3.4 Mean longitudinal acceleration, , until time tn
9.4 Evaluation of characteristic values
Annex A (normative) Presentation of results
Bibliography