Quoted from o-din:Yes, that comes with the territory if you go fording. It is best to wipe the excess WD-40 out of the cap before putting it back on. You will have a hard time starting the truck if you just try to wipe the water out.
Just don't drop the rotor into the river you are stuck in while you are at it.
o-din, sound like you know this from experience! I was going to post the same, being as my other hobby is Jeeps. Got a Willys 46-2A that does not see mud, but have had many other beaters that did.
Anyway, Been there, done that, got the T-Shirt for it. I now carry many spare parts for just that reason!
And WD-40 is and essential!