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A bicycle brake device comprises a friction member, a base member, a link structure, and a piston. The base member includes a hydraulic cylinder. The link structure is configured to couple the friction member to the base member so as to move the friction member relative to the base member between a

A bicycle brake device comprises a friction member, a base member, a link structure, and a piston. The base member includes a hydraulic cylinder. The link structure is configured to couple the friction member to the base member so as to move the friction member relative to the base member between a rest position and a braking position. The piston is movable in the hydraulic cylinder in a movement direction and configured to push the link structure to move the friction member from the rest position toward the braking position.

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1. A bicycle brake device comprising: a friction member including a friction surface;a base member including a hydraulic cylinder;a link structure configured to couple the friction member to the base member so as to move the friction member relative to the base member between a rest position and a b

1. A bicycle brake device comprising: a friction member including a friction surface;a base member including a hydraulic cylinder;a link structure configured to couple the friction member to the base member so as to move the friction member relative to the base member between a rest position and a braking position, the link structure including a first link member pivotably coupled to the base member about a first pivot axis, anda second link member pivotably coupled to the first link member about a second pivot axis parallel to the first pivot axis, the friction member being attached to the second link member; anda piston movable in the hydraulic cylinder in a movement direction and configured to push the link structure to move the friction member from the rest position toward the braking position, the friction member including a curved surface configured to change a direction in which the friction surface faces relative to the second link member in a rest state where the friction member is positioned at the rest position relative to the base member, whereinthe piston is provided between the first pivot axis and the friction member. 2. The bicycle brake device according to claim 1, wherein the piston is configured to push the first link member to move the friction member from the rest position toward the braking position. 3. The bicycle brake device according to claim 1, wherein the piston is at least partially provided in a link area defined by an outline of the first link member when viewed from the movement direction. 4. The bicycle brake device according to claim 3, wherein the piston has a center axis parallel to the movement direction, andthe center axis is provided in the link area when viewed from the movement direction. 5. The bicycle brake device according to claim 2, wherein the first link member includes a receiving portion contactable with the piston, andthe piston is configured to push the receiving portion of the first link member. 6. The bicycle brake device according to claim 5, wherein the first link member includes a first frame portion pivotably coupled to the base member about the first pivot axis, andthe receiving portion is secured to the first frame portion. 7. The bicycle brake device according to claim 6, wherein the first link member includes a second frame portion pivotably coupled to the base member about the first pivot axis, andthe receiving portion is secured to the second frame portion. 8. The bicycle brake device according to claim 7, wherein the first frame portion is spaced apart from the second frame portion in an axial direction parallel to the first pivot axis, andthe receiving portion is provided between the first frame portion and the second frame portion in the axial direction and couples the first frame portion to the second frame portion. 9. The bicycle brake device according to claim 1, further comprising: a first biasing member configured to bias the first link member relative to the base member toward the piston. 10. The bicycle brake device according to claim 1, wherein the base member is configured to guide the second link member to maintain the direction in which the friction surface faces when the friction member moves between the rest position and the braking position. 11. The bicycle brake device according to claim 1, further comprising: a second biasing member configured to bias the second link member relative to the first link member toward the base member. 12. The bicycle brake device according to claim 2, wherein the piston is coupled to the first link member without being fixed to the first link member. 13. The bicycle brake device according to claim 1, further comprising: an additional friction member;an additional base member including an additional hydraulic cylinder;an additional link structure configured to couple the additional friction member to the additional base member so as to move the additional friction member relative to the additional base member between an additional rest position and an additional braking position;an additional piston movable in the additional hydraulic cylinder in an additional movement direction and configured to push the additional link structure to move the additional friction member from the additional rest position toward the additional braking position; anda coupling member configured to couple the base member to the additional base member. 14. The bicycle brake device according to claim 13, wherein the hydraulic cylinder includes a fluid passageway connected to a hydraulic chamber defined by the hydraulic cylinder and the piston,the additional hydraulic cylinder includes an additional fluid passageway connected to an additional hydraulic chamber defined by the additional hydraulic cylinder and the additional piston, andthe coupling member includes an intermediate fluid passageway configured to connect the fluid passageway to the additional fluid passageway. 15. The bicycle brake device according to claim 14, wherein the coupling member has a mounting structure configured to mount the coupling member to a bicycle frame. 16. The bicycle brake device according to claim 15, wherein the mounting structure has a mounting opening extending along a mounting axis, andthe intermediate fluid passageway at least partially extends in a mounting direction parallel to the mounting axis. 17. The bicycle rim brake device according to claim 13, wherein the link structure includes a first additional link member pivotably coupled to the additional base member about a first additional pivot axis, anda second additional link member pivotably coupled to the first additional link member about a second additional pivot axis parallel to the first additional pivot axis, the additional friction member being attached to the second additional link member,the additional friction member includes an additional friction surface, andthe additional friction member includes an additional curved surface configured to change a direction in which the additional friction surface faces relative to the second additional link member in a rest state where the additional friction member is positioned at the additional rest position relative to the additional base member. 18. A bicycle brake device comprising: a friction member;a base member including a hydraulic cylinder;a link structure configured to couple the friction member to the base member so as to move the friction member relative to the base member between a rest position and a braking position; anda piston movable in the hydraulic cylinder in a movement direction and configured to push the link structure to move the friction member from the rest position toward the braking position,the link structure including a first link member pivotably coupled to the base member about a first pivot axis,the piston being configured to push the first link member to move the friction member from the rest position toward the braking position,the link structure including a second link member pivotably coupled to the first link member about a second pivot axis parallel to the first pivot axis,the friction member being attached to the second link member,the friction member having a friction surface which faces a rotatable member,the base member including a guide surface,the link structure including a guide member mounted on the second link member, andthe guide member being in contact with the guide surface to maintain an orientation of the friction surface of the friction member between the rest position and the braking position. 19. The bicycle brake device according to claim 18, wherein the guide member is rotatably mounted on the second link member. 20. A bicycle brake device comprising: a friction member including a friction surface;a base member including a hydraulic cylinder;a link structure configured to couple the friction member to the base member so as to move the friction member relative to the base member between a rest position and a braking position, the link structure including a first link member pivotably coupled to the base member about a first pivot axis anda second link member pivotably coupled to the first link member about a second pivot axis parallel to the first pivot axis, the friction member being attached to the second link member; anda piston movable in the hydraulic cylinder in a movement direction and configured to push the link structure to move the friction member from the rest position toward the braking position, the friction member including a curved surface configured to change a direction in which the friction surface faces relative to the second link member in a rest state where the friction member is positioned at the rest position relative to the base member, whereinthe piston is provided between the first pivot axis and the second pivot axis.