Hope Tech C2 Brake - Manual (Page 16)

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3.5. Hose change
If the hose becomes damaged such that a system leak (however small) occurs then
replace the hose. Try to identify how the original damage occurred to prevent the same
thing happening again. A new length of genuine Hope Technology hydraulic hose will
need purchasing. Follow the procedure for shortening/re routing the hose in section 3.4.
Note, in section 3.4, the hose is disconnected from the lever in the same manner as
described for disconnecting from the caliper.
3.6. Caliper half change – piston removal
This operation is required if you change your forks (or frame) to one that incorporates a
different disc mount design. In most cases you can utilise your existing Hope disc brake
by changing the caliper half to a new one that has the appropriate bolt mounting
pattern. Consult your dealer who will advise what caliper half is required.
This procedure can also be used should you need to remove a caliper piston.
1. Remove the wheel and brake pads to prevent contamination.
2. To obtain better leverage leave the caliper on the fork (or frame) and use an Allen
key to just release the tightness of the two caliper half retaining screws. Remove the
caliper from the fork (or frame), there is no need to disconnect the brake hose.
3. Place the caliper over a clean rag to catch the brake fluid and completely remove
the two caliper half retaining screws. The caliper will separate into two halves.
The piston from the old caliper half needs transferring to the new caliper half. The
Closed 2 and XC4 calipers require an additional step prior to removing the piston.
4. Closed 2 caliper
The piston requires unscrewing using a pin spanner. In most situations the piston
will easily unscrew, if it is tight then do not force it with the pin spanner or you may
damage the piston, in this case use the appropriate Hope tool available from your
Hope dealer. Unscrew the piston to the end of its travel, at this point it will rotate
freely without unscrewing any further. Now follow step 5 to completely remove the
piston from the caliper.
XC4 Caliper
The procedure is similar to the Closed 2 caliper described above except the piston
requires unscrewing using a broad flat blade.
5. To remove the piston (all calipers) a bicycle ‘track pump’ is required. Open the
bleed nipple 1/2 turn place the air line over the bleed nipple. Place your thumb over
the recessed transfer hole and ask a second person to apply pressure with the
pump. The piston will eventually eject with some force so point the caliper towards a
clean rag to catch the piston and prevent damaging it. Caution : do not look directly
at the piston whilst carrying out this operation otherwise it can fly out and strike you
in the face.