Description
K021558-G - SR-7 SPRING BRAKE MODULATING VALVE
PART NUMBER(S):
Fleet Products: K021558-G | Replaces OE: Bendix: K021558, 021558, 21558, 745K021558, BEN-K021558, BW K021558, K21558 | OE: 0091559, K021557 | Automann: 170.K021558 | Mack: 745-K021558, BWK021558 | Navistar: BXK021558 | PACCAR: K021558BXW | Newstar: BER-K021558, S-27028, S27028
DESCRIPTION:
Model: Bendix SR-7 Spring Brake Modulating Valve
Vehicles: Heavy-duty trucks and tractors using compatible dual-circuit air brake systems with spring brake actuators
• Valve Type: Pneumatic spring brake modulating valve
• Control Port: One 3/8" push-to-connect fitting
• Balance Port: One 3/8" push-to-connect fitting
• Supply Port: One 1/2" NPT
• Delivery Ports: Four 3/8" NPT
• Park Control Port: One 1/4" NPT
• Mounting Studs: 3/8"-16 threads with 0.94" stud length
• Dimensions: 125 mm long x 137 mm wide x 124 mm high
• Mounting: Stud-mounted, bolt-on replacement configuration
• Function: Controls and modulates spring brake application and release
• System Use: Dual-circuit air brake systems requiring balanced parking and emergency spring brake operation
Applications:
Designed for compatible heavy-duty vehicle air brake systems requiring an SR-7 valve to control spring brake application, release, and modulation. It is typically replaced when spring brakes release slowly, apply unexpectedly, fail to remain released, or the valve develops internal or external air leakage.
CROSS-REFERENCE(S):
3525518, 5010393, 5010914, 5010915, 5010916, 5010917, 5011180, 5012045, 5012046, 5013055, 5017233, 642015, 801328, 801329, 91559, BANK021558, BENK021558, K021246, K021292, K021293, K021295, K021297, K021442, K025932, K041542, K041547, K041894, K043387, K049149, K049151, K049152, K049153, K049154, K049155, T5010851, T5010851A, TWDBENK021558, KO21558, 060-KO21558
A cross-reference listing means this part may be a suitable replacement for the listed part numbers. Always verify fitment before installation.
IMPORTANT INSTALLATION NOTES:
✔ Confirm the 3/8"-16 mounting studs and 0.94" stud length match the original valve.
✔ Connect the 3/8" push-to-connect control and balance ports in the original positions.
✔ Match the 1/2" supply, four 3/8" delivery, and 1/4" park control connections to the vehicle air schematic.
✔ Apply air-system-compatible thread sealant without allowing sealant to enter the valve ports.
✔ Pressurize and leak-test the system, then verify complete spring brake application, modulation, release, and pressure retention.
Warranty Information
