This Recommended Practice is derived from the Federal Motor Vehicle Safety Standard 135 vehicle test protocol as a single-ended inertia-dynamometer test procedure. It measures brake output, friction material effectiveness, and corner performance in a controlled and repeatable environment. The test procedure also includes optional sections for parking brake output performance for rear brakes. It is applicable to brake corners from vehicles covered by the FMVSS 135 when using the appropriate brake hardware and test parameters. This procedure is applicable to all passenger cars and light trucks up to 3500 kg of GVWR.
This Recommended Practice is the result of an industry effort to develop inertia-dynamometer test procedures based upon the FMVSS 105 and 135 vehicle tests. Results from these tests provide a laboratory assessment of the brake corner performance. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics to predict vehicle performance.
The conditions defined in this Recommended Practice are drawn from FMVSS 105 or 135 vehicle test experience. The deceleration levels are not necessarily based on those needed to meet the requirements of the FMVSS. These procedures are intended to properly represent the lining conditioning which occurs during an FMVSS vehicle test.
This revised Recommended Practice also includes a test procedure for vehicles with a Gross Vehicle Weight Rating above 3 500 kg and below 4 540 kg covered under the FMVSS 105, except school buses. FMVSS 135 test procedure is covered by Section 8.1 and Table 2. FMVSS 105 test procedure is covered by Section 8.2 and Table 3. The different items, definitions, and sections indicate clearly whenever it applies only to the FMVSS 105 or the FMVSS 135 test procedure.