The use of air brakes on a downgrade is only a supplement to the:
a) Use of the spring brakes
b) Use of the front brake limiting valve
c) Braking effect of the engine
Answer: c) Braking effect of the engine
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a) Use of the spring brakes
b) Use of the front brake limiting valve
c) Braking effect of the engine
Answer: c) Braking effect of the engine
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.