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A roller brake tester is a method of allowing the dynamic assessment of the braking system of a motor vehicle, whilst the vehicle itself is in a static condition.This type of brake tester is normally used in UK garages when used as part of an inspection lane for the MOT test.
SAE J1269 and SAE J2452 performed on new tires. SAE J2452 is a standard defined by the Society of Automotive Engineers [1] to measure the rolling resistance of tires. [2] Where the older standard, SAE J1269, produces measurements of rolling resistance under steady-state (i.e. thermally equilibrated) operating conditions, SAE J2452 produces measurements during a transient history of speed that ...
When measured by using these standard test practices, most new passenger tires have reported RRCs ranging from 0.007 to 0.014." [6] In the case of bicycle tires, values of 0.0025 to 0.005 are achieved. [17] These coefficients are measured on rollers, with power meters on road surfaces, or with coast-down tests. In the latter two cases, the ...
When measured by using these standard test practices, most new passenger tires have reported RRCs ranging from 0.007 to 0.014. [2] In the case of bicycle tires, values of 0.0025 to 0.005 are achieved. [3] These coefficients are measured on rollers, with power meters on road surfaces, or with coast-down tests.
The length of the braking test track at the Aldenhoven Testing Center is 150 m, which contains an asphalt and a ceramic pavement lane. Both lanes are 4 m wide and may be wetted as preferred. The braking test lane is surrounded on both sides by a safety zone. A 200 m access acceleration lane is also part of the braking test track. [3]
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Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
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