Yes it is needed, Even worst case an adjustable one fitted but these are more than a std one, It's a safety item so I would really have a go at them, OK if you wanted it removed for track work but even then as above a adjustable one is a must

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306 Rallye Sptint/Race Car, 205 CTI 1.9 8v to name a few

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2012/2013/2014/2019 Class Winners at Gurston Down Speed Hillclimb & Joint overall, Class record too along the way,

That's terrible...

You need to have some way of limiting brake fluid flow to the rear to stop the rear wheels locking under heavy braking causing you to possibly lose control of the vehicle.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone