My experience indicates that modern car suspensions etc are designed with the assumption they have working brake servos and power steering systems. They are just not driveable without them. As for an emergency situation, I dont believe an emergency stop or avoidance manouever is possible without these systems operable.
The poster who says that power steering is only an issue at low speed is incorrect. I have experienced what it is like to lose power steering or brake servo assistance (not simultaneously) at moderate speed and on both occasions it was a "brown underpants" moment.
I have an engineering background and good knowledge of automotive engineering, but in both cases it took me 3 or 4 seconds to realise what was happenning, and the manual effort to steer or brake in both cases took enormous effort for my "strong male physique" to muster.
My kids/wife/many many others just would not cope as in effect it seems the steering is "locked" and the brakes appear to have become ineffective.
It concerns me that, because of modern design, we are effectively exposed to a single failure potentially causing a dangerous life threatening scenario.
One gripe I have concerns the stiff plastic vacuum pipes used in many VAG models that split with age and can cause sudden loss of brake servo. How many times have we read "the driver claimed his brakes had failed...."?
How may fatal accidents have occured when faults of this kind have occurred, but the reason was never uncovered by investigators?
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