Bleeding valve, a hydraulic fitting and a venting assembly for a bicycle hydraulic braking system

A bicycle hydraulic brake system bleeding valve comprising:

• a valve body that has a radially outer wall having a first threaded portion and, at a second axially inner portion with respect to said first portion, an annular throat for receiving an O-ring and is rotatably insertable in a seat of a brake caliper and comprising a first end, a second end and an axial inner cavity open on said first end, said valve body further comprising a radial duct close to said second end and in fluid communication with said axial inner cavity;
• said valve body comprising a head at said first end equipped with a radially outer surface configured to be engaged by a wrench;
• a closing body having an end portion equipped with a head insertable in said head of the valve body;
• said head of the closing body comprising a blind cavity configured to be engaged by an operating tool;
• and,
• the inner cavity of the valve body includes connection members configured to mate with connection members on said closing body and hold said closing body in the inner cavity.