SAE J45:2018 pdf free

SAE J45:2018 pdf free.Brake System Test Procedure – Snowmobiles
This procedure offers a method of testing snowmobiles on turf. Turf is preferred over snow because test repeatability is more easily obtained. In addition, tests shall be conducted under winter conditions to ensure that the braking systems remain operative and that the vehicle has no undue tendency to lose stability, overturn, or swerve out of a test lane 1.2 m (4 feet) wider than the vehicle when the brakes are applied. The purpose of the document is to establish brake system capabilities with regard to deceleration or stopping distance versus applied brake lever force, as affected by vehicle speed, brake temperature, and usage.
The surface of the ground shall be covered with a maximum of 75 mm (3 inches) of loose snow over a base consisting of at least 75 mm (3 inches) of snow sufficiently compacted to support the snowmobile without significant penetration.
The hardness of the snow surface shall be verified prior to testing by traversing the snowmobile over the test lane at a steady speed as slow as clutch engagement will allow and verifying at least 25 mm (1 inch) of track lug penetration. A track with less than a 25 mm (1 inch) lug shall have full lug penetration. Lug height is to be determined by measuring from the track belt to the maximum lug height.
The brake force shall be applied in a manner equivalent to that shown in Figure 1. The effective brake lever force shall be applied at a point no more than 25.4 mm (1 inch) from the end of the control lever in a direction normal to the hand grip and in the plane of rotation of the control lever.
Vehicles shall be tested at the specified speed for each test. If the specified speed cannot be obtained, the test speed shall be the greatest achievable speed evenly divisible by 8 km/h (5 mph).
For example: if 61 km/h (38 mph) is the maximum speed achievable, the test speed for the 64 km/h (40 mph) requirement would become 56 km/h (35 mph).) If the maximum achievable speed is less than 8 km/h (5 mph), the test speed shall be 5 km/h (3 mph).SAE J45 pdf free download.