>> So next time my neck goes through similar repeated G forces as F1 drivers it
>> may not be entirely the driver's fault.
The retardation given by brake retarders is usually relatively light. As far as I know they come in at least three types ~ hydraulic, eddy current, and exhaust brakes. However it's a few years since I had anything to do with them so there may now be more (or even less!) than three types. Here's some information about heavy vehicle braking systems. tinyurl.com/yzk3v28
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