A bicycle brake including a pre-assembled assembly intended to be mounted on a bicycle frame through two fastening pins is disclosed. The brake includes a first lever and a second lever each having an actuation arm and a braking arm. A support element of the first lever and second lever includes a through hole coaxial to a first rotation axis (X1) of the first lever and a through hole coaxial to a second rotation axis (X2) of the second lever. A first hollow pin is provided with a longitudinal cavity for passage of a first fastening pin of the pre-assembled assembly to the bicycle frame. A second hollow pin is provided with a longitudinal cavity for passage of a second fastening pin of said pre-assembled assembly to the bicycle frame.

A bicycle rim brake is basically provided with a first brake arm and a hydraulic actuation device. The first brake arm includes a first coupling portion configured to pivot about a first pivot axis, a first actuated portion and a first mounting portion. The first mounting portion is configured to mount a first friction member and extends from the first coupling portion. The hydraulic actuation device is operatively coupled to the first actuated portion of the first brake arm. The hydraulic actuation device includes a cylinder housing defining a hydraulic chamber, a first piston movably disposed in the hydraulic chamber of the cylinder housing, and a first sealing member provided on the cylinder housing so as to at least partially support the first piston in the hydraulic chamber.

A bicycle rim brake is basically provided with a first brake arm and a hydraulic actuation device. The first brake arm includes a first coupling portion configured to pivot about a first pivot axis, a first actuated portion and a first mounting portion. The first mounting portion is configured to mount a first friction member and extends from the first coupling portion. The hydraulic actuation device is operatively coupled to the first actuated portion of the first brake arm. The hydraulic actuation device includes a cylinder housing defining a hydraulic chamber, a first piston movably disposed in the hydraulic chamber of the cylinder housing, and a first sealing member provided on the cylinder housing so as to at least partially support the first piston in the hydraulic chamber.

A brake for a bicycle includes a base, first and second arm assemblies. The first and second arm assemblies are pivoted to the base. The first arm assembly has a first end portion, for connection of a brake line a second end portion for frictionally contacting a brake side of a wheel rim. The second arm assembly is pivoted to the base and corresponds to the first arm assembly. The second aim assembly has a third end portion, a fourth end portion and a second abutting portion which is arranged on the third end portion. The second abutting portion is located correspondingly above the first abutting portion and interferable with the first abutting portion in a pivoting direction of the first abutting portion. The fourth end portion is swingable toward the brake side to clip the other brake side of the wheel rim.

A brake for a bicycle includes a base, first and second arm assemblies. The first and second arm assemblies are pivoted to the base. The first arm assembly has a first end portion, for connection of a brake line a second end portion for frictionally contacting a brake side of a wheel rim. The second arm assembly is pivoted to the base and corresponds to the first arm assembly. The second aim assembly has a third end portion, a fourth end portion and a second abutting portion which is arranged on the third end portion. The second abutting portion is located correspondingly above the first abutting portion and interferable with the first abutting portion in a pivoting direction of the first abutting portion. The fourth end portion is swingable toward the brake side to clip the other brake side of the wheel rim.

A hydraulic brake having a master unit, a slave unit, and a hydraulic line. The hydraulic line is filled with a hydraulic fluid and connects the slave unit to the master unit. Further, the hydraulic line has a continuous internal cross-section reduced in at least one longitudinal portion thereof. A method for the installation of a hydraulic brake having a master unit and a slave unit connected to a hydraulic line is also provided.

A hydraulic brake having a master unit, a slave unit, and a hydraulic line. The hydraulic line is filled with a hydraulic fluid and connects the slave unit to the master unit. Further, the hydraulic line has a continuous internal cross-section reduced in at least one longitudinal portion thereof. A method for the installation of a hydraulic brake having a master unit and a slave unit connected to a hydraulic line is also provided.

A bicycle rim brake comprises a first shaft, a second shaft, a first brake arm, a second brake arm, and a reinforcing member. The first shaft includes a first fixed end part fixedly provided with respect to a bicycle body. The second shaft includes a second fixed end part fixedly provided with respect to the bicycle body. The first brake arm is pivotally provided on the first shaft around a first pivot axis. The first brake arm has an opposite surface opposite to the first fixed end part. The second brake arm is pivotally provided on the second shaft around a second pivot axis. The reinforcing member couples the first shaft to the second shaft. The reinforcing member is provided such that the first brake arm is at least partially arranged farther from the first fixed end part than the reinforcing member.

A bicycle rim brake comprises a first shaft, a second shaft, a first brake arm, a second brake arm, and a reinforcing member. The first shaft includes a first fixed end part fixedly provided with respect to a bicycle body. The second shaft includes a second fixed end part fixedly provided with respect to the bicycle body. The first brake arm is pivotally provided on the first shaft around a first pivot axis. The first brake arm has an opposite surface opposite to the first fixed end part. The second brake arm is pivotally provided on the second shaft around a second pivot axis. The reinforcing member couples the first shaft to the second shaft. The reinforcing member is provided such that the first brake arm is at least partially arranged farther from the first fixed end part than the reinforcing member.

A V-type brake is provided for being assembled on a bicycle, the bicycle including two fork arms and a wheel set which is assembled between the two fork arms, the V-type brake including: two brake swing arms, respectively for being pivotably assembled on the two fork arms toward the wheel set, each said brake swing arm having a connecting portion; two brake pad assemblies, respectively assembled on the two brake swing arms, each said brake pad assembly having an assembling slot, the assembling slot positionably and slidably arranged within the connecting portion. A brake system is further provided, including the V-type brake mentioned above, further including a cable assembly, the cable assembly connected to the two brake swing arms, the cable assembly being operable to drive the two brake swing arms and the two brake pad assemblies to swing toward the wheel set.