Slack adjuster assembly for drum braking systems

A slack adjuster assembly for use with a heavy-duty vehicle drum brake system, the slack adjuster assembly comprising:

• a slack adjuster;
• a cam tube assembly;
• and
• an inboard sealing assembly and an outboard sealing assembly, said outboard sealing assembly including a tubular sealing ring having an L-shaped projection extending radially-inward;
• wherein said inboard sealing assembly engages an inboard side of said slack adjuster to completely enclose a central aperture of the slack adjuster and form a 360-degree interface, and said outboard sealing assembly engages an outboard side of said slack adjuster to form a 360-degree interface;
• and
• wherein said L-shaped projection limits grease being purged from said cam tube assembly.