I pulled off the brake drum. There's no sign of a wheel cylinder leak but the bearing grease is about the color and consistency of a chocolate milkshake. This is definitely what was leaking on the outside of the wheel. What would cause this? Is it a sign the wrong grease was used? New brakes, drums and bearings were installed by a shop about a year (only 300 miles) ago. The clean grease inside the dust cap is red.