21.   Some three-quarters of the vehicles failed pollution emission tests, while a third had faulty brakes.

a. + brake >>共 149
anti-lock 27.29%
antilock 18.97%
parking 4.66%
faulty 3.49%
four-wheel 3.16%
front 2.00%
new 1.83%
hydraulic 1.66%
standard 1.66%
defective 1.50%
faulty + n. >>共 447
wiring 5.79%
product 3.06%
equipment 2.82%
intelligence 2.09%
valve 2.09%
gene 2.01%
construction 1.85%
system 1.85%
brake 1.69%
tire 1.45%
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