LiftMaster K75-10184 Brake Pressure Plate Assembly
The LiftMaster K75-10184 brake pressure plate assembly is used inside select SD/GSD commercial operator brake assemblies. Its job is to act as part of the brake friction stack so the operator can hold the door when stopped and release the door when commanded.
A pressure plate can wear, warp, or be damaged by overheating, loose hardware, a misadjusted brake, or a dragging door. Since the pressure plate works with the brake disc, mounting plate, solenoid, spring hardware, and release linkage, it should be evaluated as part of the complete brake assembly.
K75-10184 is often shown near K75-10180 in SD/GSD parts lists, but the two parts perform different functions. Ordering by diagram is important because commercial brake parts can look similar across SD, GSD, GH, GT, and T operator families.
Compatible With
Use this pressure plate only where the LiftMaster parts diagram calls for K75-10184 or the confirmed alternate number.
- LiftMaster SD industrial-duty slide door operators where K75-10184 is listed
- LiftMaster GSD heavy industrial slide door operators where K75-10184 is listed
- Select LiftMaster commercial brake assemblies using the B12 brake pressure plate assembly callout
- Brake systems associated with SD/GSD voltage-specific brake kits when the pressure plate is sold separately
K75-10184 is not the same as K75-10180. It also should not be substituted for solenoids, brake discs, or complete brake kits.
Also Known As / Related Part Numbers
Known related references include:
- K75-10184
- 75-10184
- 7510184
- 305-105205
- 305105205
- K75-10184 Brake Pressure Plate Kit
- K75-10184 Brake Pressure Plate Assembly
- Related part: K75-10180 Brake Mounting Plate Assembly
- Related part: 10-10187 Brake Solenoid Cover
- Related part: 10-10191 Brake Disc
- Related part: 80-9001 Feather Key
- Related part: 86-CP04-112 Cotter Pin
- Related part: 87-P-062 / 87-P062 Push Ring Fastener
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Brake pressure plate assembly |
| Part Number | K75-10184 |
| Application | Commercial operator brake assembly |
| Compatible Operator Type | Select SD and GSD industrial-duty slide door operators |
| Also Known As | 305-105205, 305105205 |
| Notes | Pressure plate only; not a complete brake kit |
Technician Note
When replacing a pressure plate, inspect friction surfaces, spring pressure, brake disc condition, solenoid stroke, and linkage movement. Installing a new pressure plate against a damaged disc or misadjusted brake can cause the same problem to return.
Before Ordering
- Match the exact part number on the operator parts diagram or the removed part whenever possible.
- Confirm the operator model, horsepower, voltage, phase, and production series before ordering.
- Check nearby brake, clutch, chain, shaft, and hardware components for wear so the new part is not damaged by another failed component.
- Do not substitute similar-looking commercial operator parts unless the LiftMaster parts breakdown confirms the same item number.
- Confirm whether the operator diagram calls for K75-10184 or a complete brake kit.
- Inspect the brake disc and mounting plate for scoring, warping, or heat damage.
- Verify the door is balanced and not forcing the brake to hold excessive load.
Professional Advisory
A brake that slips or drags is a safety concern. Do not continue operating a heavy commercial door until the brake assembly and door system have been inspected and tested.
Product Questions & Answers
What does the brake pressure plate do?
It is part of the brake friction assembly that helps the operator hold the door when stopped.
Is K75-10184 used on GSD operators?
Yes, it is commonly listed for select LiftMaster GSD and SD commercial slide door operator brake assemblies.
What is the related alternate number?
305-105205 and 305105205 are commonly associated with this brake pressure plate.
Is this a complete brake kit?
No. It is the brake pressure plate assembly only. Other brake components are separate unless sold in a complete kit.
What causes a pressure plate to fail?
Heat, worn friction material, misadjustment, loose hardware, solenoid problems, and door load issues can all contribute to pressure plate damage.
