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When Emrullah Karaca began working at a factory in Gifhorn, Germany, where the auto parts supplier Continental builds components for hydraulic brakes, he was looking for a temporary job after finishing high school.

Ethylene oxide is used to manufacture ethylene glycol, a toxic chemical used in hydraulic brake fluids, antifreeze, inks and paints.

The ZX is also fitted with Tecktro mechanical disc brakes, not pricier hydraulic brakes, which are more reliable and provide better modulation.

Cowboy says the C4 now features “200 custom-made parts” assembled by Flex in Hungry, including the motor, tires, and hydraulic brakes.

Others complain about wobbly wheels, hydraulic brakes that make noise or don’t work, or a wide range of cryptic error codes that flash on their disabled bike’s display.