问题描述：
英语翻译
2.What is true about downshifting before you reach a long downhill grade?
Downshifting helps prevent the brakes from overheating and losing braking power.
3.How can you know you have the engine speed and road speed to shift gears?
By using the sound of the engine to know when to shift; You know you have the engine speed and road speed to shift gears
4.What is the purpose of brake retarders?
Retarders are to help slow down the vehicle and to reduce brake wear.
5.Should you turn the retarder off when the road is wet or snow covered?
Yes the retarder may cause a skid.
2.What is true about downshifting before you reach a long downhill grade?
Downshifting helps prevent the brakes from overheating and losing braking power.
3.How can you know you have the engine speed and road speed to shift gears?
By using the sound of the engine to know when to shift; You know you have the engine speed and road speed to shift gears
4.What is the purpose of brake retarders?
Retarders are to help slow down the vehicle and to reduce brake wear.
5.Should you turn the retarder off when the road is wet or snow covered?
Yes the retarder may cause a skid.
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