Hope Tech C2 Brake - Manual (Page 14)

14
Bleeding the Open 2 and DH4 disc brake
Item number references refer to the diagram of the Pro lever in section 5.2. The
procedure is identical if you have a Sport lever.
Wear safety glasses.
1. Remove the wheel and brake pads to prevent contamination.
2. Push the caliper pistons back into their bores and insert a spacer between the
pistons to prevent them coming out during the bleed operation.
3. If necessary reposition the brake lever so that the lever and master cylinder is
horizontal to the ground.
4. Remove the master cylinder cap (item 22) using a 26mm spanner.
5. Place the closed end of an 8mm spanner over the bleed nipple on the brake
caliper. Fit a length of clear plastic hose (approximately 30cm) onto the bleed
nipple and place the free end into an empty container. The hose should be a snug
fit and not fall off, the free end does not need to be submerged under brake fluid.
6. Open the bleed nipple 1/2 turn. Screw an M5 bolt into the master cylinder piston
(item 21) and pull out. Caution, the piston may suddenly pull out and splash brake
fluid. Close the bleed nipple.
7. Fill the master cylinder reservoir with brake fluid.
8. Open the bleed nipple a 1/4 turn. Slowly pull the brake lever to the handle bars and
hold. Close the bleed nipple. Release the lever. Caution, squeezing the lever too
fast will cause brake fluid to squirt out of the master cylinder.
9. Repeat step 8 until no air is seen coming out of the bleed nipple. You will need to
keep refilling the reservoir during this operation. Caution, if bleeding a rear brake
be careful not to spill brake fluid onto the front brake caliper and disc.
10. Ensure the pistons are fully retracted in the caliper, the pistons may require
manually pressing back.
11. Place a rag around the master cylinder to catch any spillage and fill the master
cylinder to just below the top surface.
12. Open the bleed nipple a 1/4 turn. Place the piston into the master cylinder and
allow the fluid to overflow. Gently push the piston down until it is 1mm below the top
surface. Close the bleed nipple and remove the bleed hose. Caution, do not over
tighten the bleed nipple. Wipe away any spilt fluid from the caliper and lever.
13. Fit the master cylinder cap and gently tighten with a 26mm spanner.
14. Replace the pads and insert the wheel. Pull the lever several times to allow the
pads to reset themselves to the disc.
15. Check the brake for correct function and that there are no any system leaks.