If hydraulic brakes fail, a driver can reduce their speed by: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question If hydraulic brakes fail, a driver can reduce their speed by: Answers Shifting into a higher gear. Shifting into a lower gear. Finding a hill. Letting the truck run out of gas. Explanation If your hydraulic bakes fail, shifting into a lower gear can help slow your vehicle down. This questions appears in the following tests: District Of Columbia Class A Knowledge Test Illinois Class A Knowledge Test Kansas Class B Knowledge Test Kansas Double Maryland Class B Knowledge Test New York Class A Knowledge Test New York Passenger North Dakota Bus Pennsylvania Class A Knowledge Test Texas Class B Knowledge Test Utah Class A Knowledge Test Wyoming Double