3.0 ML350 CDI V6 BlueEfficiency Sport
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£6,350
- Year/Month: 2010/0
- Stock ID: T118814
- Transmission: Automatic
- CC: 3000
- Mileage: 178218
- Fuel Type: Diesel
- 223 Views
When a buyer talks about best midsize sedan cars for sale, he can think about Bmw that is loaded with lots of novelties. However, here the selected one will be discussed that is Brake. A used car buyer should know that the control unit is located in the luggage compartment floor, between the spare wheel compartment and the rear wall, behind the rear sofa. The control unit consists of the following components: the electric motor, a threaded shaft, the self-closing spring, the balancing lever, the cable return pulleys, the plastic gears, and the control cables. However, that location is not identical in all versions of the brand; hence, need to check when a buyer pick any.
The Control Unit
If the parking brake is operated, the electric motor starts the threaded shaft through the plastic gears. Through the thread on the shaft the balancing lever, for compensation between right and left, is moved back and forth on the threaded shaft. Depending on whether the brake is to be activated or released. The transmission pulleys of the cable are fixed to the balancing lever through connection levers. The control cables for the right and left sides are hooked into the cable return pulleys. If the balancing lever moves on the threaded shaft during the tightening of the parking brake, the transmission pulleys of the cable rotate inwards and operate the control cables which in turn tighten the Duo Servo drum brake.
Control Cables
If the parking brake is released, the electric motor rotates the threaded shaft in the opposite direction. The balancing lever is moved backward and the cable return pulleys rotate outwards. The control cables are slid back and the parking brake is released. In the Duo Servo drum brake, the return force is generated by the return springs. So that the whole holding force of the parking brake, in pulled condition, does not completely damage the plastic gears, a self-locking spring is mounted. The self-locking spring is applied to the threaded shaft. If the parking brake is pulled and the threaded shaft has reached the locking position, the return force attempts to rotate the threaded shaft in the opposite direction. Through this rotation movement in the opposite direction, the first turns of the self-closing spring are pressed outwards, against the surrounding body.
The Brake Protection
In this way, the threaded shaft is kept in its position and the return forces are contrasted by the self-locking spring. When the parking brake is released, the threaded shaft is driven by the electric motor and drags the opposite end of the self-locking spring. In this way, the spring is rotated inwards and detached from the body. To protect the brake drums and the brake pads from corrosion and to always achieve an optimum effect, the system occasionally activates the brakes. This happens almost once a month. The system brakes automatically and without the driver noticing. During braking the parking brake is operated with a force with respect to the predefined or specific force; The wear caused by this braking is extremely low. So, the discussion is technical but need to heed when a buyer decides to pay the best midsize sedan cars price to used car exporters.
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