Description
MA15690 – MAXIBRAKE 50-SERIES SPRING BRAKE (8.00" PUSH ROD)
PART NUMBER(S):
Fleet Products: MA15690X (Remanufactured) | Replaces OE: HALDEX MA15690, MA15690X, KSC50HBBC-800NN | (1.75" Push Rod Adjustable) MA15691, MA15691X, KSC50HBBC-175NN
DESCRIPTION:
Model: MA15691 Maxibrake 50-Series spring brake chamber
Vehicles: Air-brake equipped trucks, trailers, and buses
• Type: Type 50 spring brake chamber (service size 50)
• Push Rod: 8.00" length, 1.75" stroke (adjustable)
• Ports: dual service/emergency configuration
• Mounting: 4.75" stud spacing, 7/8" holes
• Push Rod Hole: 1.50"
• Max Pressure: 150 PSI
• Housing: all-steel construction
• Piston: dual piston (service & spring)
• Bearings: nylon (prevents metal-to-metal contact)
• Seals: packing cup type
• Spring: heavy-duty
• Torque Spec: 100–125 in-lb cap screws
• Designed for consistent pressure and durability
Applications:
What does this spring brake fit? It's engineered for air-brake equipped highway tractors, trailers, and buses using a 50-series spring brake with 8.00" push rod. Designed to deliver parking and emergency brake function in Haldex Maxibrake configurations.
CROSS-REFERENCE(S):
8W3956, M6006589, MA15691, KSC50HBBC800NN, KSC50HBBCS45013, 5396-MA15691, 767653016832, HDX MA15691, KSC50HBBC-800NN, KSC50HBBC45013, MBIMA15691, MIDMA15691, KSC50HBBCS45009, ZZMA15691, MDMA15690, 145-8825, 57180, 478533, 50HBBC - MA15690
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Block wheels before removal or installation service to prevent vehicle movement.
✔ If air is available, apply air to the emergency inlet to release the spring before installing or removing the release bolt and washer.
✔ If air is not available, install the release bolt and washer with a hand wrench until the internal stop is contacted to compress and hold the emergency springs.
✔ Disconnect air lines, remove mounting hardware, and handle the unit carefully due to its approximate 50 lb weight.
✔ Use only a press meeting the required minimum dimensions and apply slow, light, firm pressure during disassembly and reassembly to avoid damaging the unit.
✔ Sealing surfaces must be completely free of dust, grease, and oil before applying sealing compound. Do not allow sealing compound on the outer lip of the packing cup.
✔ Allow sealing compound beneath the retainer ring to set for at least 8 hours before assembling the piston into the cylinder.
✔ Lubricate all specified bores, seal grooves, and O-rings with the supplied lubricant during reassembly.
✔ Torque service and emergency chamber cap screws to 100–125 in-lb. Over-tightening can strip cap screw threads.
✔ Replace the service filter with the new filter supplied in the service kit.
✔ After removing the release bolt, install the rubber plug into the release bolt hole to prevent contaminants from entering through an unfiltered passage.
✔ Adjust brakes to vehicle specifications so actuator stroke is as short as possible and brake shoes do not drag.
✔ Confirm the brake adjuster is approximately 90 degrees to the push rod when fully applied and adjusted.
✔ Test full brake operation before removing wheel blocks.
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
