2. Remove the expansion tank.
3. Remove the O-ring from the GTZ.
Attention: when removing the retaining ring, take care not to damage the piston and cylinder walls.
4. Remove the circlip from the GTZ body. When installing the retaining ring, replace the retaining ring with a new one. If necessary, a rod of a suitable diameter can be used to fix the second piston (see picture).
5. Remove the piston of the first brake circuit. Then remove the piston of the second brake circuit.
6. Assembly is carried out in the reverse order. Before installing the first and first pistons, lubricate the cylinder surface with clean TJ.