Easy
Less than 15 minutes
This brake ring is an authentic manufacturer replacement part used in sanders. It is a circular ring measuring approximately 3.5 inches in diameter. The brake ring is responsible for controlling the spinning motion of the sanding disc/sanding pad during use. When the sander is off, the brake ring engages with the disc to gradually slow it down and stop it. This reduces the risk of potential damage or injury from the disc abruptly stopping. Over time the brake ring can break or wear down causing the disc to spin too fast or continue spinning when the equipment is switched off. To access the faulty brake ring, you will need to first detach the sanding pad. Depending on your model, you may need to open the rotor case as well. Next, lift the brake ring off the sander and discard it. Clean the mounting area to remove any sawdust and debris. Attach the new brake ring and align the sanding disc with the mounting holes before securing it with the mounting screw.
Brake Ring 421866-9
OEM part for: Makita
Part Number: 421866-9
Ships within 1 business day 
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Frequently Purchased Together ?
Compatibility
This part will fit the following 12 machines
Makita
This item works with the following types of products:
- Sander Parts
This part replaces obsolete part #: 416062-2
Customer Part Reviews ?
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Questions & Answers ?
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Old brake ring disintegrated
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Switch and brake were worn and dust bag torn.
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Sander stopped when touched to workpiece.
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
switch faulty and coasted to stop instead of stopping
Tool Type
Sander
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
spinning too fast under no load
Tool Type
Sander
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
stopped the too fast spin with no load and no paper, however, still spins too fast under no load with coarser (heavier) paper.
vibration, stripped screw, broken dust bag
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Sander was not sanding properly and was making a grinding sound
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Sanding pad stopped rotating, although it continued to oscillate The old break came apart and jammed up the works..
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
The brake ring in my Makita orbital sander broke.
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Scotchbrite pad
Parts Used
2. Removed the broken brake ring and cleaned the surfaces with a Scotchbrite pad.
3. Put the new brake ring in place and screwed the hard pad back on.
4. Other than aligning the holes for the screws on the reinstall, it was an easy fix.
Plastic brake ring broke
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
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Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
