Friction assembly having a friction frame and wear liner

A friction assembly, comprising:

• a body comprising a support frame having interstices defined therein, the support frame comprising a first friction surface disposed around the interstices and configured to engage a working surface of a vehicle;
• and
• a wear liner configured to be coupled to the support frame within the interstices of the support frame and comprising a second friction surface configured to engage the working surface the vehicle;
• wherein one of:
• the wear liner extends past and covers the first friction surface of the support frame for the second friction surface of the wear liner to initially engage the working surface of the vehicle exclusive of the first friction surface, the wear liner configured to wear down over time through frictional engagement with the working surface of the vehicle until the second friction surface lies within the interstices and is coplanar with the first friction surface to engage the working surface of the vehicle together;
• or
• the wear liner defines the second friction surface in the interstices of the support frame, and the first friction surface and the second friction surface are coplanar and positioned to engage the working surface of the vehicle together.