Correct answer
Unequal braking force between the wheels.
Unequal braking force between wheels can make the vehicle pull to one side when braking. The symptom needs inspection; it does not by itself establish a low fluid level or mean all lorries use hydraulic wheel cylinders. Stop safely and seek assistance for a brake fault.
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It is normal and the brakes need no inspection.
Unequal braking force between the wheels.
Always a low engine-oil level.
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