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Chassis
Published in Tom Denton, Automotive Technician Training, 2015
Once you are satisfied with all the above tests, then a road test should be carried out. Ideally, this should be on a private road or area in good dry conditions (inaccurate diagnosis can be made in wet conditions – wheels tend to lock at lower speeds). From a slow speed, brake gently and then gradually increase the speed as you become confident in the operation of the brakes. At a slow speed, brake harder and note the feel of the steering wheel. If the wheel pulls one way, it indicates uneven braking is being applied to the front wheels. Apply the parking brake when the vehicle is not moving. Engage a gear and try to pull away. The engine will usually ‘win’ but this test gives a good feel for the parking brake performance! During the above tests, check for general stopping power, pedal pulsation, vibration and any unusual noises. Locking of the rear brakes during braking may indicate a faulty proportioning or load-sensing valve.
Annotated Dictionary of Construction Safety and Health
Published in Charles D. Reese, James V. Edison, Annotated Dictionary of Construction Safety and Health, 2018
Charles D. Reese, James V. Edison
All equipment left unattended at night, adjacent to highways or construction areas, must have lights, reflectors, and/or barricades to identify location of the equipment. Supervisory personnel must ensure that all machinery and equipment is inspected prior to each use to verify that it is in safe operating condition. Rated load capacities and recommended rules of operation must be conspicuously posted on all equipment at the operator’s station. An accessible fire extinguisher of 5 BC rating or higher must be available at all operator stations. When vehicles or mobile equipment are stopped or parked, the parking brake must be set. Equipment, on inclines, must have wheels chocked, as well as the parking brake set.
Running gear
Published in Andrew Livesey, Practical Motorsport Engineering, 2019
The hand-brake, also called parking-brake, may be hand operated, or foot operated. On large automatic cars (US standard saloons) the parking-brake is typically applied by the driver’s left foot (the right foot operates both the accelerator and foot-brake pedals). The parking brake is released by a separate hand-operated lever underneath the dashboard.
Effect on friction performance of mining wet brake under different working conditions
Published in Mechanics of Advanced Materials and Structures, 2021
Chuanwei Zhang, Teng Zhang, Xuewu Li, Yuan Lv, Bin Zhong
As shown in Figure 1, the structure and working process of the wet multi-disc brake is mainly composed of the service brake piston, the parking brake piston, the dynamic friction disc, the static friction disc, the return spring, the spline shaft, the platen and the case. During normal operation, the parking brake piston is in high pressure state and the return spring is compressed; in the case of service brake, the external pump provides pressure to push the service brake piston, which then compresses the static friction disc to rub against the dynamic friction disc to achieve the purpose of braking. As to the parking brake mode, the external hydraulic oil is released and the parking brake piston loses the pressure, which will restore the deformed return spring to push the platen toward the parking brake piston, and finally the static friction discs and the dynamic friction discs would be compressed to brake.
Design and feasibility analysis of a novel auto hold system in hydrostatic transmission wheeled vehicle
Published in Automatika, 2020
Lv Chang, Jianguo Dai, Shuo Liu
According to the comparisons between the results of the auto hold system and the other two methods, the auto hold system has three advantages, as follows: The auto hold system proposed by this manuscript provides a valley value of the parking brake forces greater than the ones required by the vehicle, thus ensuring that the vehicle can be parked safely on the ramp. Moreover, the parking brake force provided by the system can be changed in real time with the slope to ensure that the vehicle can be safely parked on any ramp.Through the comparative analysis of the parking brake force provided by the auto hold system and the EPB system, the parking brake forces provided by the auto hold system are about 10% larger than that provided by the EPB system. Therefore, the system provides a greater security and can provide a fault tolerance range for subsequent real vehicle experiments. Due to the influence of the sensors’ errors and ramp information, the parking brake forces in the real vehicle experiments may be greater than the theoretical ones required by the vehicle, so it is necessary to provide a fault tolerance range to ensure that the vehicle can be safely parked on any ramp.If the parking brake force is very large, more power is required to be supplied to the auto hold system, which will result in waste of power and the parking brake force. And it is also possible that hysteresis occurs when the vehicle starts. Hence, the advantages of the auto hold system are not proportional to the parking braking force. However, the parking brake forces provided by the auto hold system are only 10% larger than ones of the EPB system, and will not cause adverse impacts due to excessive parking brake force. It is also possible to provide a security domain for the vehicle to be parked safely.