When dismantling the piston seals of the calliper or master cylinder, it's very important to wipe them immediately after you've taken them out of their spot. You can then choose to submerge the parts in unspoiled brake fluid so as to prevent expansion or deformation. Indeed, seals that soaked in a used, oxidized brake fluid are subject to a chemical reaction that makes them expand or deform. They can no longer be installed as a result, so you have to replace them with new seals.


To dismantle the master cylinder piston, use a pair of special, long-teethed pliers with an elastic ring -- the ring that holds the piston in place is deeply cast into the cylinder. This might represent a major investment for some of you, making the brake fluid flush a perfect job for your local specialist. Otherwise, a pressure pump and/or vacuum pump may also prove necessary. If you know how to use your hands and like mechanical challenges, my advice to you is to put your money on quality tools. You'll get a full return on your investment in a couple of years.

The other way to perform a brake fluid flush without dismantling the components requires a lot more attention. Depending on your brake system, you may have to be extra careful and most likely use a vacuum pump. A pump system with integrated fluid reservoir can make your job easier; however, it's quite expensive. Some manufacturers, like Harley-Davidson, offer it in their tool catalogues.

I hope you'll find these tips and information useful. Good luck!


Photo Credit : Honda, KTM