A few weeks ago, I saw a small leak from the left headlight washer pump on a BMW. I love these washers. They have really strong pressure, and since the fluid in BMW is heated, it clears the headlights in no time in winter from snow, slush, etc. I have bad eyesight and wear RGP contact lenses, so during the night, good lights are a must (both BMW and VW have HID lights, which are exceptional. Sequoia has LED, and let's say, there is A LOT to wish for. Honda, well, it is a horror show.).
The way the work is that when the lights are on, every 3rd windshield spray activates headlight washing. I changed that through software to every 5th time. I guess, after 14 years, the gasket inside the cylinder gave up.
Got FEBI aftermarket through FCP Euro, $29, and takes maybe 30min to replace. Most of the time is spent on removing the wheel, plastinc protection, then it is easy peasy:
Removing plastic cover takes 2sec:
Most work is about removing wheel etc.
Here it is how it looks underneath. It clips into position:
Old leaking pump. The way it works is that the main pump pushes fluid, and the pressure pushes the cylinder out. Once the pump stops, the spring inside returns the cylinder to the closed position. And that spring is really strong. I could not take it out with one hand and take a
photo: