Apparatus for absorbing shocks in a vehicle braking system

Apparatus for reducing pressure peaks of a pneumatic medium within a vehicle braking system below a predetermined maximum, comprising:

• housing wall means enclosing a chamber having first and second end walls, said housing wall means including first and second cylindrical parts, each having an internal cavity and an open circular end, said open circular ends being fitted together such that the internal cavities together form said chamber;
• a cap located within the chamber adjacent the first end wall;
• a coil spring within the chamber having one end abutting against the cap and extending away therefrom toward the second end wall of the chamber;
• a piston received within the chamber and having a first end portion contacting the spring other end and a second end portion extending away from the spring toward the chamber second end wall;
• a butyl rubber membrane having peripheral edge margins continuously sealingly affixed to the housing wall means and a central portion of said membrane folded about the piston second end portion;
• openings in the housing wall means through which pneumatic medium passes into the chamber and in pressurizing contact with the membrane tending to urge said membrane toward the piston;
• a mesh plate having edge portions affixed to the housing wall means and includes a central part located between the membrane and that part of the chamber including the housing wall means openings, said membrane peripheral edge margins and the mesh plate edge portions are clamped between the first and second cylindrical parts at the open circular ends.