Automobile Engineering in ME
The main function of a master cylinder is to

Adjust the extent of brake pedal free play
Convert brake pedal force into hydraulic pressure
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Boost the force applied to brake pedal

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Supplies a large amount of fuel and thereby creates a choke effect
Warm up and lubricate the pump
Enable the pump's fault diagnosis function to operate
Pressurise the fuel system before the engine is started

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Automobile Engineering in ME
The main characteristics of a maintenance free (MF) battery is that

A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
Recharging of a maintenance free battery is neither required nor possible
A maintenance free battery has a relatively short shelf life when compared with standard batteries
Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

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