How the washer system works- Filler cap

Fluid for screen washing is drawn by a pump from the washer bottle and fed to the spray jets.

Most systems incorporate a switch-operated electric pump, but some have hand-operated push-button pumps. Many washer bottles have a non-return valve at the foot of the pick-up pipe.

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Checking windscreen wipers and washers

Windscreen washers and wipers must, by law, be in working order. Keep the washer bottle topped u...