SAE J2688:2020 pdf free

SAE J2688:2020 pdf free.Parking Brake Control ldentification – Vehicles with Hydraulic Brake Systems and Automatic Transmissions
The scope and purpose of the SAE Recommended Practice is to provide standards for the control and indication of parking brakes in hydraulic braked vehicles over 4540 kg (10000 lb) GVWR. This recommended practice pertains to automatic transmission applications and supplements the SAE J915 recommended practice. This recommended practice does not address parking brake system performance. Parking brake system performance, both static and dynamic conditions, is the responsibility of the OEM vehicle manufacturer or manufacturers that modify the vehicle by adding special vocational required equipment (such as but not limited to outriggers, cranes, etc.).
A mechanical device incorporated in the transmission that when engaged locks the transmission from moving resulting in the parking function. This device functions only when the vehicle is stopped (not moving) and does not provide dynamic braking performance.
A dry friction drum or disc brake assembly commonly called the“parking brake” that is actuated to provide the holding forces to park the vehicle. These parking brakes can be utilized to meet special requirements for dynamic (vehicle moving) vehicle braking performance.
A keypad is a set of buttons or a pre-printed film surface arranged in a block or “pad” which usually bear digits, symbols and alphabetical letters that represent the various transmission shift positions
Spring Applied and Air pressure Release actuator utilizing air pressure from the air brake system or a separate compressed air pressure source on the vehicle to release the parking brake. The parking brake is applied by releasing the pressure allowing the actuator spring to apply.
Spring Applied and Hydraulic pressure Release actuator utilizing hydraulic pressure from the hydraulic braking system or a separate hydraulic pressure source on the vehicle to release the parking brake. The parking brake is applied by releasing the pressure allowing the actuator spring to apply.
Spring Applied and direct Electrical power Release actuator utilizing the vehicle electrical system or a separate electrical system on the vehicle to release the parking brake. The parking brake is applied by releasing the electrical power allowing the actuator to apply.SAE J2688 pdf free download.