Correct answer
Unequal braking action between the two sides.
Unequal braking action between the two sides may cause it, due to wear, contamination, sticking or a component fault. The symptom requires inspection; it does not establish that oil or fluid is always low in a wheel cylinder. Many lorries use pneumatic actuation. Stop safely and arrange assistance to have the fault checked.
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All vehicles normally veer sideways when braking.
Unequal braking action between the two sides.
Cab ventilation changes brake pressure.
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