Oily substance running out of center of where tire goes on truck?

Yes it could be brake fluid check your brake reservoir or it could be grease especially after a long trip a mechanic should have a look at it ~~
 
brake fluid most definitely don't even drive it to a shop get it towed if your caliper or drum cylinders are leaking they could blow out at any minute (that means no brakes) don't drive it , it's not worth the risk!!
 
Back
Top