Magura Disc Brake Bleeding
It is very important to use only Magura Blood mineral oil in our brakes. Using any other type of fluid may cause damage to the seals or cause the brake to overheat causing total brake failure. Using any other fluid other than Magura Blood will also void the warranty.
- Marta SL, Marta, and Gustav M – Fix the caliper in a position so that the hose connection to the caliper is at the highest point possible. Hose must be positioned vertically. You may have to loosen or unscrew the caliper fitting bolts that connect the caliper to the frame or fork to get the caliper in this position.
Louise FR, Louise, Julie – Fix the caliper in a position so that the bolts that hold the caliper together are horizontal. You may have to unscrew the lower caliper fitting bolt to get the caliper in this position.
- Remove pads and push the pistons back into their cylinders completely with a plastic tire lever. It is important to remove the pads during a bleed to ensure they are not contaminated.
- Assemble your Magura syringe, tube, and m6 threaded bleed fitting. Fill this completely with Magura Blood only. Make sure your bleeding syringe is totally full and air free. Unscrew the 3 mm or 5 mm bleed plug located on the caliper with a hex wrench and attach your bleeding syringe. Tighten fitting 1/8 turn with an 8 mm open end wrench.
- Loosen the 5 mm clamp bolt and level the master cylinder (lever assembly) so that the reservoir is horizontal and slightly tighten the clamp bolt so that it stays in place.
- Take the reservoir cap off with a T7 torx wrench and remove the rubber membrane.
- Start the bleeding process by pushing the fluid through the system from the bottom up using the bleeding syringe. Use a second syringe to take the excess fluid out of the reservoir before it over flows. Also, it is important to tap the caliper and line while pushing the fluid through with the handle of a screwdriver, etc. Push almost the entire amount of fluid through the system.
- Slowly start cycling the lever blade. This will push the fluid through the system from the top and out the caliper and into the bleed syringe. Keep the reservoir full of Magura Blood with the second syringe so you do not introduce air into the system. Cycle lever 20 times or until air bubbles are no longer coming from caliper. Your system should now be totally air free.
- Make sure the reservoir is completely full and re-install the reservoir membrane and cap with torx screw.
- Important step – Place the pads back in the caliper, but do not secure them. Take the caliper fitting screws completely out of the mounting tabs so the caliper is free. Now re-install the wheel with the rotor. Place the caliper with pads on the rotor without fitting screws. Push fluid into the system with the bleed syringe still attached to the caliper. Stop pushing on syringe when you feel resistance. This will set the pistons/pads on the rotor for the particular pad wear and put the maximum amount of fluid in the system.
- Take the caliper off the rotor and take the pads out of the caliper. Loosen and take the bleed syringe off the caliper. Then re-install the bleed plug and tighten.
- You are now ready to re-install your pads and properly set-up your caliper on the rotor.
from Buck Mitchell