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For spring-brake systems requiring modulation and anti-compounding in a single component, the Bendix SR-7 Spring Brake Modulating Valve integrates both essential functions. Its port layout features a 1/2-14 NPT supply port, four 3/8-18 NPT delivery ports, and 1/4-18 NPT control connections for the spring-brake circuit. Engineered for heavy-duty reliability, the valve is rated for 107 PSI hold-off pressure, an operating temperature range of -40°F to 200°F, and full FMVSS 121 compliance. The Bendix K021557 provides complete SR-7 modulation and anti-compounding performance without requiring separate spring-brake control valves.
| Anti-Compounding | Yes |
| Balance Port | 1/4-18 NPT |
| Control Port | 1/4-18 NPT |
| Delivery Port 1 | 3/8-18 NPT |
| Delivery Port 2 | 3/8-18 NPT |
| Delivery Port 3 | 3/8-18 NPT |
| Delivery Port 4 | 3/8-18 NPT |
| Exhaust Orientation | Exhaust Facing Down |
| Exhaust Port | Dust Shield |
| Market Indicator | Aftermarket New |
| Maximum Operating Temperature | 200 AdegF (93 AdegC) |
| Minimum Operating Temperature | -40 AdegF (-40 AdegC) |
| Mounting | 3/8-16 UNC-2A Stud (2x) |
| Mounting Stud Length | .94 IN |
| Park Control Port | 1/4-18 NPT |
| Regulatory Compliance | FMVSS 121 |
| Spring Brake Hold-Off Pressure | 107 PSI |
| Supply Port | 1/2-14 NPT |
| Country of Origin (Primary) | MX |
| UPC | 07894294750658 |
| VMRS Code | 013010496 |
| Brand | Part Number |
|---|---|
| BWK021557 | |
| WORLD AMERICAN | WA13121557 |
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