So, your miter saw brake seems to have lost its effectiveness. It doesn’t seem to slow down the sawblade anymore. Or maybe it keeps squealing loudly near the edge.
So, you’re wondering why is it that your miter saw brake not working.
Well, the reason behind the miter saw brake not working may be a faulty switch or a blown-out fuse. A loose arbor screw or a build-up of carbon can cause this as well. However, there are several fixes. Firstly, try running it non-stop for about 5-10 minutes. If it doesn’t work, consider installing new motor brushes.
Still confused? Well, don’t worry! Because in this article, we have provided the reasons behind the miter break not working. And provided several possible solutions for you, as well!
Keep reading to find out!
Reasons Why Miter Saw Brake Not Working
There may be different reasons why your Miter saw brake is not working. So, let’s take a glance at what the problems are and how you may fix them.
|Replace the switch
|Clean the commutator with 600-grit aluminum oxide sandpaper and replace the motor brushes
|Loose arbor screw
|Tighten the arbor screw
|Clean the commutator and replace the motor brushes
|Worn motor brushes
|Replace the motor brushes
|Broken brake assembly
|Replace the brake assembly
|Disconnected brake wires
|Reconnect the brake wires properly
Now, it’s finally time to dive deep!
Reason One: Faulty Switch
A faulty switch can prevent the electric brake from working properly. This can result in the blade continuing to spin after the saw is switched off.
When dealing with a faulty switch in a miter saw, replacing it with a new switch is the recommended solution. Here’s an elaboration of the solution process:
- Identify the faulty switch: Before proceeding with the replacement, ensure that the switch is indeed the source of the problem. Check for any visible signs of damage or malfunction, such as loose connections, burnt marks, or physical defects.
- Purchase a compatible replacement switch: To ensure compatibility, obtain a new switch that is specifically designed for your miter saw model. You can refer to the manufacturer’s website, user manual, or contact their customer support for information on the appropriate replacement switch.
- Disconnect the power source: Before performing any repairs or replacements, ensure that the miter saw is completely disconnected from the power source. Unplug the power cord or remove the batteries, depending on the power supply of your miter saw.
- Access the switch: Depending on the model and design of your miter saw, you may need to remove a protective cover or access panel to reach the switch. Follow the manufacturer’s instructions or refer to the user manual for guidance on accessing the switch.
- Remove the faulty switch: Carefully disconnect any wires connected to the faulty switch. Take note of the wire connections or take a picture to ensure proper reconnection later. Unscrew or release any mounting brackets or screws holding the switch in place. Remove the faulty switch from its position.
- Install the new switch: Take the new switch and position it in place of the old one. Make sure it aligns properly and fits securely. Reattach any mounting brackets or screws to hold the switch firmly in place.
- Reconnect the wires: Refer to the notes or the picture taken earlier to reconnect the wires to the appropriate terminals on the new switch. Ensure that the connections are secure and properly seated. Double-check the wiring to verify correct polarity and alignment.
- Test the replacement: With the new switch installed and all connections secure, restore power to the miter saw by plugging it in or reinserting the batteries. Switch on the saw and test the brake functionality. The blade should stop quickly and effectively after the saw is switched off. If the brake engages correctly, the replacement switch was successful.
- Reassemble and finalize: Once you have confirmed that the new switch is functioning properly, reassemble any covers, panels, or components that were removed to access the switch. Ensure that everything is securely in place.
Reason Two: Carbon Build-up
Over time, carbon build-up can affect the effectiveness of the brake. This build-up can occur on the commutator (a part of the motor) or the motor brushes.
Here’s a step-by-step guide to cleaning the commutator:
- Disconnect the miter saw from the power source and ensure that it is turned off.
- Locate the commutator, which is typically a cylindrical part located near the motor brushes.
- Gently rub the 600-grit aluminum oxide sandpaper against the surface of the commutator. Use light pressure and make sure to cover the entire surface evenly. This will help remove the carbon build-up.
- After cleaning, use a soft brush or cloth to remove any residual debris from the commutator.
- Inspect the motor brushes for wear. If they appear worn or damaged, it’s advisable to replace them with new brushes to ensure optimal performance.
- Once the commutator is clean and the brushes are in good condition, reassemble the miter saw and test the brake to verify its functionality.
Reason 3: Loose arbor screw
If the arbor screw, which secures the blade to the saw’s arbor, is loose, it can prevent the brake from engaging effectively.
To resolve this problem, you need to tighten the arbor screw securely. Here’s a step-by-step explanation of the solution:
- Ensure the miter saw is turned off and unplugged from the power source. Safety should always be a priority when working with power tools.
- Locate the arbor screw. It is usually located at the center of the blade, securing it to the arbor.
- Use an appropriate tool, such as a wrench or a socket wrench, to grip the arbor screw. The specific tool required may vary depending on the miter saw model.
- Turn the wrench or socket wrench in a clockwise direction to tighten the arbor screw. Apply firm and even pressure, but be careful not to overtighten and damage the screw or the arbor.
- Check the blade for any movement or play. It should be securely fastened to the arbor without any wobbling.
- Once the arbor screw is tightened, verify that the brake is now functioning properly by turning on the miter saw and observing whether the blade comes to a quick stop when the saw is turned off.
Reason 4: Failing Armature
A failing armature can result in poor commutation, leading to brake failure. Commutation refers to the process of energizing the motor coils. If the armature is dirty, the commutation may be affected.
To address the issue of a failing armature, you can follow these steps:
Cleaning the commutator: The commutator is a part of the armature that comes into contact with the motor brushes. Over time, it can accumulate dirt, dust, or debris, which can interfere with proper commutation.
To clean the commutator, you will need 600-grit aluminum oxide sandpaper. Gently rub the sandpaper on the commutator while the motor is not running, removing any dirt or build-up. Make sure to clean the entire surface of the commutator.
Replacing the motor brushes: Motor brushes are responsible for conducting electricity to the armature. Over time, these brushes can wear out, leading to poor commutation and brake failure.
To replace the motor brushes, you will need to refer to the manufacturer’s instructions or the specific guidelines for your miter saw model. Generally, replacing the brushes involves removing the brush caps or covers, carefully removing the old brushes, and inserting the new brushes. Ensure that the new brushes are properly aligned and seated in their designated positions. Replace the brush caps or covers securely.
Reason 5: Worn Motor Brushes
When the brake fails to engage, worn motor brushes are often the cause. These brushes are responsible for conducting electricity to the motor.
To resolve the issue of worn motor brushes and restore proper brake functionality, the solution is to replace the worn brushes with new ones. Here’s an explanation of the steps involved in replacing motor brushes:
- Ensure safety: Before working on the miter saw, make sure it is unplugged from the power source to prevent any accidents or electrical shocks. Safety should always be the top priority when handling power tools.
- Access the motor brushes: Depending on the miter saw model, the motor brushes are typically located near the motor housing. You may need to remove a cover or access panel to reach them. Refer to the manufacturer’s instructions or user manual for specific guidance.
- Remove the old brushes: Carefully disconnect the wires attached to the motor brushes. In most cases, the brushes are held in place by springs or small clips. Gently release the tension on the springs or remove the clips to take out the old brushes.
- Install new brushes: Take the new motor brushes, ensuring they are the correct size and type recommended for your miter saw model. Insert the new brushes into their respective positions, making sure they align properly with the commutator. The brushes should fit snugly in their holders.
- Reconnect wires: Reattach the wires to the new motor brushes, ensuring a secure connection. Double-check that the wires are properly seated and tightened to prevent any loose connections.
- Test the brake: After replacing the motor brushes, reassemble any covers or access panels that were removed. Plug in the miter saw and test the brake functionality. Switch on the saw and observe if the brake engages properly when the saw is turned off. The blade should come to a quick stop.
Reason 6: Broken Brake Assembly
If the brake assembly itself is broken, it may not be able to engage properly, resulting in the miter saw brake not working.
Here are the general steps involved in replacing a broken brake assembly:
- Gather the necessary tools and parts: Identify the specific brake assembly needed for your miter saw model. Obtain a replacement brake assembly from the manufacturer or an authorized dealer. Additionally, gather the required tools, which may include screwdrivers, wrenches, or other tools specified in the instructions.
- Disconnect the power source: Before starting any work, ensure that the miter saw is unplugged or disconnected from its power source. This step is crucial for your safety while working with electrical components.
- Disassemble the miter saw: Follow the instructions provided by the manufacturer to disassemble the necessary parts of the miter saw to access the brake assembly. This may involve removing the blade guard, blade, and other components that obstruct access to the brake assembly.
- Remove the broken brake assembly: Locate the brake assembly within the miter saw. Depending on the model, it may be attached to the motor or in a separate housing. Carefully disconnect any electrical connectors or wiring connected to the brake assembly. Remove the screws or fasteners holding the assembly in place and gently detach it from the miter saw.
- Install the new brake assembly: Take the replacement brake assembly and position it correctly in the miter saw, aligning it with the mounting holes. Secure it in place using the appropriate screws or fasteners. Reconnect any electrical connectors or wiring, ensuring a proper and secure connection.
- Reassemble the miter saw: Follow the manufacturer’s instructions to reassemble the miter saw, putting back the components you removed earlier. Make sure all parts are properly aligned and fastened according to the instructions.
- Test the brake functionality: Once the miter saw is reassembled, reconnect the power source and perform a test to ensure the new brake assembly is functioning correctly. Switch on the saw, engage and disengage the brake, and verify that the blade comes to a complete stop when the brake is activated.
Reason 7: Disconnected Brake Wires
If the wires connecting the brake to the power source are disconnected or improperly connected, it can cause the brake to malfunction. To resolve this issue, carefully inspect the brake wiring and ensure that all connections are secure and properly connected.
The solution for disconnected brake wires is to carefully inspect the brake wiring and ensure that all connections are secure and properly connected. Here’s a step-by-step explanation:
- Visual inspection: Begin by visually examining the wiring around the brake assembly. Look for any loose, frayed, or disconnected wires. Inspect the connection points where the wires should be securely attached.
- Follow manufacturer’s guidelines: Consult the manufacturer’s instructions or user manual for specific guidance on the brake wiring and connection points. Different miter saw models may have slightly different wiring configurations.
- Reconnect loose wires: If you find any wires that are disconnected or loose, gently reconnect them to their appropriate connection points. Ensure that the wires are firmly inserted or screwed into place according to the manufacturer’s guidelines.
- Secure the connections: Once the wires are reconnected, ensure that the connections are secure. Check for any play or movement in the wires, and if needed, tighten any screws or fasteners to hold the wires in place.
Test the brake: After completing the reconnection and securing of the brake wires, double-check all the connections. Once you are confident that everything is properly connected, plug the miter saw back into the power source (if the previous steps were performed safely) and test the brake functionality. Switch the saw on and off, and observe if the brake engages and stops the blade as expected.
Miter Saw Brake Not Working: General Troubleshooting Guide
You’ve already gone through the reasons why your miter saw brake might not be working. Figure out exactly which one matches your saw’s issue.
Here we’ve provided a detailed snapshot of the possible solutions you can follow. Knowing these different ways of miter saw troubleshooting for brake issues can come really handy.
Just go over them carefully and apply them to see which one solves your problem!
Step 1: Give It a Moment
If your miter saw is making a delay of 2-4 seconds, it’s normal. It is considered a typical delay a saw may do. And when working with a miter saw you have to get used to it too.
However, if the brake is still not functioning after waiting 3 to 4 seconds. Now may be the time of concern.
Be aware that it may require a few braking cycles. Only then the bushes will corroborate the round simulator girder.
Also, you will be needing to check on that. Just to make sure that the brakes aren’t resulting in the problem. That is because of the new bushes being inducted on them.
Step 2: Run It for Some Time
You can attempt running the miter saw for some time. As in doing it non-stop for about 5-10 minutes. The issue is most probably the buildup of carbon in the armature.
It may be because of the brief running time of the miter saw. That is followed by a power alteration to apply the brake. This is what spurs carbon residues on the armature.
By running your saw for some time, it will be able to wear off all the deposits. If the carbon still persists then you can use carbon residue cleaners to get rid of the residue.
Nevertheless, If it does not work, the problem is in the brake circuit. Perhaps, the field has shorted any brake circuit out. If the saw you’re using is a few years old.
Plus, if it weighs about 70 lbs, then you can use Delta parts to cure this issue. The interchangeable electric components in them will solve them all.
Step 3: Inspect the Wiring
The brakes on miter saws are usually electric brakes. They revere the wave of electricity that is running to the motor.
Do you notice the brakes not functioning exactly as they should? Then you need to realize that there may be some issue with the wiring. And you need to fix that somehow.
This is why you need to make sure that you are examining everything with good care. Do not only scan the wires that you installed.
Also, scan and check all the connections to make sure that all of them pertain optimally. This way you won’t have to encounter this issue again. This problem mainly arises with the bosch miter saw brake not working.
Step 4: Replace the Fuse
The following thing that you need to consider trying out is to watch out for any blown fuse. Carefully examine the fuse that is connected to the breaking relay.
Check if it has been blown for some reason. Because this is one of the issues that lead to difficulties in saw brakes.
However, if you find any blown-out ones or ones with related problems, replace them. This is especially the case when your Hitachi miter saw not working.
You will have to ascertain that they are getting replaced with the exact similar kind of fuse. By doing this, you should be able to solve the brake problem in your miter saw.
Step 5: Get it Checked
Finally, did any of these troubleshooting tricks work out for you? If not then need to get the miter saw checked accurately and if need calibrate.
As the brakes of the device are not something that can be simply compromised upon. Also, you should confirm that you are getting your miter saw tested in an authorized warranty center.
It will ensure the best fit for the saw. Also, you are less likely to encounter such problems with brakes afterward.
Frequently Asked Questions (FAQs):
How to make the miter saw brake work again?
To make the miter saw work again, you need to check the brake first. Look for any blown-out fuse. For instance, replacing the brushes and the trigger switch. Also, consider replacing the field. It’s the field around the armature that we’re indicating.
How to repair brake damage caused by carbon buildup?
To repair brake damage caused by carbon buildup, check on which part the buildup exactly occurred. The carbon from brushes can amass on the commutator. It may decrease the brake effect. You need to lower your head. Then allow the miter saw to operate for a minute or two. And you’re done.
How to repair brakes controlled by the centrifugal switch?
To repair any brake that’s controlled by the centrifugal switch, free up the clogging dust. Ammunition of compressed air can normally free it up. As 99% of functions create a mechanism that plugs up dust. If anything goes astray, your first action should be reaching for a blowgun.
Hope we have cleared up your question of why miter saw brake not working? Always try to determine the exact issue first. Only after that, attempt to solve the issue.
However, even after trying out everything, if none of the methods is working then get it checked by a professional to get the best outcome.
That is all for now. Have a good day!
Robert S. Dehner is an experienced content writer at Power Tool Institute. He has a wealth of experience in the field and is committed to providing you with up-to-date information and advice on the effective and safe use of power tools.