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Upgrade your fleet’s braking safety with the MGM Brakes Combination Air Brake Chamber. This MGM Brakes MJS1216AT051 is a specialized piston-style spring brake designed for superior performance and fail-safe reliability. Unlike standard chambers, the MJS series piston design is engineered to maintain air pressure even if internal seals are damaged, allowing the vehicle to "hold off" the power spring and complete its route safely. Built with a lightweight yet rugged aluminum housing and an epoxy-coated power spring, this 1.75-inch stroke chamber provides consistent parking force and smooth service braking. It is designed for long-haul durability and features an external breather tube to keep corrosive debris and moisture out of the internal housing, significantly extending the life of your wheel-end components.
| Breather Tube | Breather Tube |
| Chamber Type | Piston Brake |
| Diaphragm Diameter | Rubber IN |
| Mounting Bolt Length | 1.170 IN |
| Mounting Bolt Thread | 7/16-14 |
| Port Size | 3/8-18 NPTF |
| Spring Size | 16 |
| Service Size | 12 |
| Stroke | 1.75 IN |
| UNIT | Aftermarket |
| Country of Origin (Primary) | US |
| 2 | |
| VMRS Code | 013004000 |
| Brand | Part Number |
|---|---|
| MERITOR | A423276L12 |
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