Brake Dust Shields: What They Are and Why They’re Important

Reviewed by

Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Written by CarParts.com Research Team - Updated on February 2nd, 2024

Reading Time: 5 minutes
Summary
  • Brake dust shields keep debris and other harmful dust out of your wheels and braking system.
  • Brake dust is made up of iron particles, carbon residue, and friction material. It is the byproduct of normal friction material wear while braking.
  • Accumulated brake dust can increase brake noise, cause unusual vibration, and damage your brake rotors and alloy wheels. If you continuously drive without brake dust shields, dust particles can significantly damage your braking system.

What Is a Brake Dust Shield?

Also known as a wheel dust shield, the brake dust shield’s main function is to keep debris and other harmful dust out of your wheels and braking system. Additionally, it helps protect other drivetrain and suspension parts from the damaging effects of heat.

Brake dust shields are usually made of stamped steel sheet metal, but are sometimes aluminum.

Brake dust shields are bolted to the spindle. The plate shown in this photo is visible because the rotor has been removed. This is the left rear brake shield on a car from the northern US where salt on the roads causes a lot of rust. This one needs to be replaced. But usually the shield is good for the life of the car and is pretty easy to straighten when it gets bent, and that happens sometimes during pad replacement. The brake shield will scrub against the rotor and make a lot of noise when it gets bent toward the rotor. | Image Source: Richard McCuistian.
Brake dust shields are also called brake backing plates on older models that have drum brakes installed. (See part indicated by white arrow in the photo). The brake shoes in this photo are completely worn out. The backing plate shown primarily functions as a mounting point for your vehicle’s brake shoe parts. Brake shoe backing plates are made of much thicker steel than rotor backing plates and serve a different function. | Image Source: Richard McCuistian.

What Is Brake Dust and Where Does It Come From?

Brake dust is made up of iron particles, carbon residue, and friction material. It is the byproduct of normal friction material wear while braking. Drum brakes tend to trap the brake dust created by the shoes as they wear and can cause squeaking or squealing noises until the dust is cleaned out, though this doesn’t always happen.

Disc brakes don’t store brake dust the way drum brakes do. On disc brakes, the dust tends to blow away or cling to the wheel so that it needs to be washed off for aesthetic purposes. The disc brake backing plate does nothing to prevent dust. It’s more for keeping rocks and dirt away from the rotor as the vehicle is driven.

Note: Brake dust is extremely poisonous, bad for your lungs, and should never be blown off the brake assembly with compressed air. Before doing any work on dusty brakes, always use liquid cleaners (soap and water is preferred) to remove brake dust, particularly from drum brakes after removing the brake drum.

Harmful Effects of Brake Dust

Increased Brake Noise

It’s normal for your brakes to produce brake dust, and it’s perfectly okay to see some residue on your wheels.

You may notice unusual vibration and noise once the dust gets stuck on your calipers and rotors. That’s because the accumulated dust can make the surface of your calipers and rotors uneven. A bent or damaged dust shield can also produce a brake dust shield noise that sounds like metal scraping.

Damaged Alloy Wheels

Brake dust contains abrasive substances. And dust stains in your wheels can be hard to remove. Good thing brake dust shields can help reduce the amount of dust that accumulates on your wheels.

If you notice too much brake dust in your alloy wheels, don’t hesitate to have it cleared by a professional. Leaving the stain for long periods can cause corrosion damage.

Is It Safe to Drive Without a Brake Dust Shield?

It’s technically possible to drive without brake dust shields. However, it’s recommended to have them installed if you often drive through rough terrain and areas that use a lot of mud, gravel, and/or road salt.

If you continuously drive without brake dust shields, dust particles can significantly damage your braking system.

How Much Does a Brake Dust Shield Replacement Cost?

Expect to spend anywhere between $50 and $300 for a brake dust shield replacement. Your vehicle’s year, make, and model can affect pricing.

Where to Find Top-Notch Brake Dust Shields For Your Ride

Your ride deserves the best. So if you would like to give your vehicle the best brake dust shield replacements, get them here at CarParts.com.

Use our convenient vehicle selector tool to navigate our website with ease. Input your vehicle details, and let our system filter your options to compatible brake dust shields for your ride.

All our products come with a low-price guarantee. However, this doesn’t mean that you need to compromise quality to stay within your budget. We source our replacement parts from trusted brands to ensure optimal fit and performance.

Here at CarParts.com, customer satisfaction is paramount. If you have questions about fitment or shipping, don’t think twice about calling our toll-free hotline. We’re here to assist you 24/7.

Order today, and get back on the road in no time!

Replacing Your Brake Dust Shields

Your ride’s brake dust shields are located behind the rotors, meaning, the rotors must be removed to replace them. Likewise components must be removed to replace brake shoe backing plates. Different vehicles require different procedures.

A trained professional will know how to properly install your dust shields.

If you’re not an experienced automotive DIYer, we suggest taking your ride to an auto repair shop. A trained professional will know how to properly install your dust shields.

Tips to Reduce Brake Dust

Aside from installing brake dust shields, there are other ways to minimize brake dust. Here are some of them:

Switch to Ceramic Pads

Compared to organic brake pads, ceramic brake pads produce less dust and other particles as they get older. They’re generally more expensive than metallic pads, but the benefits are worth it. Note, however, that ceramic pads are actually only about 5% ceramic and may still make some dust.

But ceramic-based friction materials produce less sticky dust that doesn’t form a heavy coating on alloy wheels. As a result, the wheels stay cleaner for longer periods. In most cases, dust residue is still visible, but it is more difficult to see because they’re typically a lighter color.

Brake Dust Repellent

There are aftermarket brake dust repellents available on the market that can effectively repel brake dusts for a few weeks. This aerosol repellent forms a protective barrier, so that the dust doesn’t accumulate on your rims.

Applying Ceramic Coating On Your Wheels

If you have extra money to spruce up your wheels, applying a layer of wheel coating can significantly reduce the harmful effects of brake dust. These wheel coatings are typically permanent or semi-permanent, making them easier to clean.

Aside from following your routine maintenance checks, it’s also crucial to have your braking system checked if you notice something unusual like excessive brake dust or reduced braking performance. It’s better to address the issue right away, than having to spend more money on complex repairs in the future.

About The Authors
Reviewed By Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Written By CarParts.com Research Team

Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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Published by
CarParts.com Research Team and Richard McCuistian, ASE Certified Master Automobile Technician