LiftMaster K75-12494 120V Brake Solenoid Kit
The LiftMaster K75-12494 brake solenoid kit is used in the brake system of select commercial door operators. During operation, the solenoid helps release or actuate the brake so the motor can move the door correctly. A failing solenoid can cause the brake to drag, prevent proper release, create humming, or make the operator work harder than it should.
This part must be matched by voltage and brake assembly design. The K75-12494 is a 120V kit and should not be replaced with a solenoid of a different voltage or mounting style. If the brake has been overheated or dragging, inspect the brake disc, brake plate, wiring, control circuit, and mechanical adjustment before returning the operator to service.
Compatible With
- Select LiftMaster commercial door operators using a 120V brake solenoid kit.
- Commercial operator brake assemblies where K75-12494 is listed in the parts diagram.
- Medium-duty and industrial-duty commercial access applications only when the exact brake kit matches.
- Not for 24V, 208V, 230V, or other brake solenoid ratings unless the operator diagram specifically calls for this kit.
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Brake solenoid kit |
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| Part Number | K75-12494 |
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| Voltage | 120V |
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| Application | Commercial door operator brake assembly |
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| Compatible Operator Type | Select LiftMaster commercial door operators |
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| Notes | Match voltage, mounting, wiring, and brake assembly before ordering |
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Also Known As / Related Part Numbers
- K75-12494
- 75-12494
- LiftMaster 120V brake solenoid kit
Technician Note
A failed brake solenoid may be the symptom of a dragging brake, incorrect adjustment, or electrical control issue. Inspect the brake system as an assembly rather than replacing the solenoid blindly.
Before Ordering Checklist
- Confirm the original solenoid is 120V.
- Verify K75-12494 in the operator parts diagram.
- Inspect brake lining and mechanical adjustment.
- Check wiring for heat damage or loose connections.
- Do not bypass or disable the brake system.
Professional Advisory
Brake assemblies on commercial operators help control heavy door movement. Do not bypass the brake or operate the door with a known brake fault. Use a qualified technician for electrical and brake service.
Product Questions & Answers
What does the K75-12494 brake solenoid do?
It is part of the commercial operator brake system and helps release or control the brake during powered operation.
What voltage is this brake solenoid kit?
K75-12494 is a 120V brake solenoid kit.
What symptoms may indicate a brake solenoid issue?
Brake drag, humming, failure to release, harsh stopping, or overheating around the brake assembly can point to a solenoid or brake problem.
Can this replace a different voltage solenoid?
No. The solenoid voltage and brake assembly must match the operator parts diagram.
Is it safe to bypass the brake if the solenoid fails?
No. A brake should never be bypassed. The brake system should be repaired before the operator is returned to service.
