had a puddle back left wheel. think it is brake fluid. reservoir down little.
If you have drum brakes in the rear, pull off the drum. You will most likely find that you have a leaking shoe piston. Check the backside of your tire. If you see fluid running down the backside, it is definately the piston.
Could be brake fluid. could be a bad axel seal. Just changed a leaking seal on my 2004 F-150. passenger side.
Search Ford F-150 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford F-150 Experts