Quote:
Originally Posted by flyerncle
Roller brake tester does not take into account deceleration only brake effort/force so could cause a fail at test/IVA.
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Reading the IVA manual I think it's covered under Brake Performance 09E -
Note 6: Decelerometer test – This method must only be used where the vehicle cannot be tested in the roller brake tester due to a design characteristic.
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Drive the vehicle on a level road at a steady speed of approximately 20mph and apply the service brake sufficient only to obtain wheel lock. Observe whether all the wheels of the rear axle(s) lock prior to both wheels of the front axle.
Having a deceleration sensitive valve would mean that was the only way the brakes could be tested, and it's definitely a design characteristic.
Still I haven't been through the IVA so this is all theory
Matt