Automobile Engineering in ME
When the brake pedal free play is less than the specified value, then the

Brake drags
Vapour locking occurs in the brake lines
Antilock braking system malfunctions
Brake fades

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Automobile Engineering in ME
The function of a second ring is that it is a

Back up oil control ring which will work in place of the bottom ring when it is broken
Back up compression ring which will work in place of the top ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Cushion ring which prevents piston slap and knock

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