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To remove rain water that's seeped into the system
To remove any oil leaks that collect here
To remove moisture drawn in from the atmosphere
To remove excess coolant
Explanation: Moisture in the air condenses as the air pressure increases. This moisture can be transmitted around the braking system and is especially dangerous in cold weather. It can lead to ice forming and blocking the valves and pipes.
Category: Vehicle Condition
References: The Official DVSA Guide to Driving Buses and Coaches: Section 2, The Official DVSA Guide to Driving Goods Vehicles: Section 2
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