I'm Still Not Sure About How A-1, Or Any Else Rebuilds The 12v Pump. The End Is Crimped Shut. The Vanes Are Phenolic. (plastic) Brake Fluid Is Not An Oil, And Has No Lubricity. "if" A-1 Actually Takes Apart The Pump, To Rebuild It, They Must Locate Those Special Vanes. Then They Must Be Able To Crimp The Pump Back Together, And, It Must Seal At 2000psi. It's Not Easy To Do. I Really Think They Just Test Those Pumps, And Re-run Them. When The Phenolic Vanes Wear Out, They Can Not Produce Enough Psi To Open The Switch, And Stop The Motor. O.k., They Offer A Lifetime Warranty, But How Often Do You Like Replacing That P/m? If You Need A New Pump Assy, We Have Them At A Cost Of $295.00