Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact
Non vertical external forces are supported by the suspension arms
The unsprung mass in lighter
The assembly is slightly more complicated in design

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
It is desired to reduce the unsprung mass
It is desired to have more flexibility in design
Large changes in load make it necessary to have a large suspension stroke

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Keeping the vehicle without use for an extended period
Overcooling of the brakes during high speed driving
Overheating of the fluid due to frequent brake application
An excessively high engine speed on a downhill road

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