Now let's take a look at that iconic front brake. I've separated the two caliper halves from their mounting plate by removing two high tensile Allen bolts. Only one caliper half carries a hydraulic piston, and by leaving the hydraulic system intact I can now pump the piston out of the caliper body with the front brake lever. And here's the first mini horror story. These early caliper designs didn't have dust seals, which means water and salt has been creeping between the piston and caliper body for years corroding up everything in its path