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Also in 1967, when disc brakes were ordered, the system received the same brass block (left), as the drum car but had an additional hold-off valve (right), whose function it is to apply the rear brakes until the system built up pressure to activate the valve applying pressure to the front brakes. The rear brakes were to come on a split second before the front. This brake method soon caused braking problems that took years to solve. The biggest problem was the car had uneven braking and wanted to slide out.