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Repair Parts Home  Power Tool Parts  Makita Parts  CB408 Carbon Brush Set

Carbon Brush Set

Part Number: CB408
Makita
Availability: 25+ in stock
Price: $8.21
Quantity:
Ships within 1 business day

*This part replaces obsolete part #: 643408-1, 195008-8 and 191938-1.

Specifications
  • Size: 6 X 9mm
Description:
This #191938-1 (CB-408) Makita carbon brush set contains two individual carbon brushes with wire leads and brush springs attached. The set contains genuine Makita replacement parts, and comes packaged in a Makita retail box.

This brush set will fit the Makita tools listed at the bottom of the page.

• Worn brushes are often the cause of a poorly running motor
• Replacing brushes can fix an intermittent motor
• New brushes can restore a motor’s electric braking


Carbon motor brushes are one of the most commonly replaced power tool components. Because carbon brushes are wear items, meaning that through friction and use they will gradually wear away, they will eventually require replacement. Worn brushes are common causes of intermittent motor function, reduced electric braking, and reduced motor power. A worn out brush will often be worn down near the wire lead and may be cracked, pitted, or burned. When replacing carbon brushes, be sure to also inspect your armature for burns, cracks, or other damage which indicates a larger motor problem.

Product Information
Manufacturer: Makita
Product Number: CB408
Classification: Part
Weight: 0.01 lbs.
Also Known As: Motor Brush Set
Shipping: Ships Worldwide
Products Compatibility

This item works with the following types of products:

  • • Drill
  • • Grinder
  • • Impact Driver
  • • Impact Wrench
  • • Laminate Trimmer
  • • Nibbler
  • • Planer
  • • Plate Joiner
  • • Router
  • • Sander
  • • Screwdriver
  • • Shear
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Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
2 of 2 people found this instruction helpful
Tool Type:
Planer
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Maintence
Using a flat head screwdriver, remove the brush caps, then remove the old brushes. You may want to blow out the brush holders and clean the edges of them so the brushes will slide easily. Then install the new brushes and replace the brush caps.
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1 of 1 people found this instruction helpful
Tool Type:
Grinder
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Needed new brushes
Using a flat blade screw driver I removed the brush caps
Then removed the worn brushes from the brush holders
Installed the new brushes in the brush holders
Screwed on the brush caps
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Tool Type:
Grinder
Parts Used:
Brush Cap - 643550-8
Carbon Brush Set - CB408
Repair Difficulty:
Hard
Time Spent Repairing:
1-2 hours
Tools Used:
, Sand paper
Bad brushes
The brushes were to big,and had to sand down
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Tool Type:
Router
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver
The motor speed varied when the control switch was at high.
Took out the old bushes with a flat screwdriver turning back the covers and replaced with new. The unit performed better but it was not a complete fix. The next step for me would have been to replace the armature so I disassembled the unit with a Phillips screwdriver. Everything looked fine other than a few carbon marks as the old bushes had worn down. I buffed with 320 wet/dry paper and reassembled with the new bushes. Unit is back to 100 percent.
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Tool Type:
Screwdriver
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Medium
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Pliers
Carbon brushes worn down.
Removed the brush caps
Removed the old brushes
Installed the new brushes
Installed the brush caps
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Tool Type:
Router
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Brushes arcing pretty heavily
Removed the brush caps, then removed the old brushes.
Installed the new brushes and the brush caps
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Tool Type:
Planer
Parts Used:
Carbon Brush Set - CB408
Field Assembly 115V - 590025-7
Armature Assembly 115V - 515791-5
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Wrench Set, Hemostat
Overheated drive motor
Remove brushes
Remove outer case
Remove belt transmission with drum and armature
Unhook field and brushes connections
Pry field (melted into case)out of case
Prepare case where melted
Extract inner armature bearing
Install and connect field and brush terminals (spiral springs)
Remove drive belt, remove drive pulley (LH threads)
Install drive pulley on new armature
Press into case
Install brushes
Install case
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Tool Type:
Grinder
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Grinder stopped spinning
Take a screwdriver out and take out the brush caps
Take out the old brushes
Put in the new brushes
Screw the brush caps back on
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Tool Type:
Grinder
Parts Used:
Carbon Brush Set - CB408
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Brushes were worn out
Removed brush caps with the screwdriver
Pulled old brushes out
Dropped new ones in
Replaced brush caps
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Tool Type:
Grinder
Parts Used:
Ball Bearing 6000DDW - 211088-7
Carbon Brush Set - CB408
Ball Bearing - 210025-8
Handle Grip - 153489-2
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Brass drift and small ballpein hammer
Bad bearings, bad brushes, missing handle.
1. Separated the case halves.
2. Removed the motor armature.
3. Removed the bearings from the armature.
4.Replaced the bearings on the armature.
5. Cleaned the brush housing by removing the brushes and using compressed air cleaned the brush housing and replaced the brushes.
6. Cleaned the inside of the housings and reassembled them.
7. Installed the missing grip.
8 Installed a new grind disk and tested.
9. Worked like a new one and the brushes did not spark a lot nor did the bearings vibrate and squeal.
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Discussion
Discussion for Carbon Brush Set - ( CB408 )
Discussion is closed. To ask our experts a question about a part, use the Q&A feature.
Question: Carbon Brush CB-408

1566894

I have some clients that say that CB-408 is too big for the 9501B power tool. Please let me know if there is any older generations of this power tool that use another carbon brush. Is this the reason that CB-76 is showed as replacement part of this power tool>
Question: Switch Or Motor

duff5110

On my Makita 9910 sometimes it will not turn on when you pull the trigger unless you tap (hit it with your fist) the top of the unit. Then it will start up. What part should I expect to replace? switch/brushes/??
Hi duff5110,
Remove you brushes and look how much wear is left on them.Also with compressed air blow out the brush tubes as often dirt and saw dust will get lodged between the brush and brush tubes and not allow good contact with the armature.But this sounds like a brush problem.Hope that helps. Good luck.
Tinker
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