Correct answer
Yes, and check that the level is between the minimum and maximum marks.
Yes. Periodically check hydraulic steering fluid according to the manufacturer’s procedure, including its specified temperature and vehicle-position conditions. The level must remain within its minimum and maximum marks; do not fill until overflowing or add an unspecified fluid. Do not wait for unusually heavy steering before checking. Low level or leaks need investigation and repair. This fluid belongs to the steering system, not the brake circuit; the question also excludes electric steering without a hydraulic reservoir.
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Yes, and check that the reservoir is so full that the fluid could spill over.
No, it is only necessary when turning the bus's steering wheel becomes harder than normal.
Yes, and check that the level is between the minimum and maximum marks.
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