Business United Muffler & Brake Inc.
We Do It Right!

Welcome to United Muffler & Brake Inc.

Your Complete Auto Care & Emissions Specialists!

United Muffler & Brake in Caldwell ID, opened its doors back in 1984 following the great Willmorth Muffler & Repair dating back to 1948 and has proudly been serving the community ever since. This family owned repair facility has been and always will take repairing cars and serving the community to keep people safe on the road their main focus. You can trust that when you enter our office and your vehicle is in our shop, it will be treated and cared for as if it was family. 

When you bring your vehicle into our Caldwell auto repair shop, we guarantee complete satisfaction and will efficiently handle all of your vehicle’s needs, from general maintenance to major repairs. We offer our quality service at affordable prices in order to serve everyone in our community. We also offer warranty on our repairs so you can have peace of mind knowing that our work will always be done right, or we will fix it.

United Muffler & Brake is your destination for smog testing and repair here in Caldwell, ID. Whether you are due for an emissions test or you are failing emissions and need a repair, you can trust that United Muffler & Brake can perform the services necessary to get you your smog certification.

Give us a call today to schedule your next visit to our shop!

We are a NAPA AutoCare Center

With the NAPA Peace of Mind Warranty service, we stand behind the service and repairs we provide you with!

For more information click here.

Have your vehicle serviced with us and remain protected with our warranty! We guarantee you, you won’t regret it!

For more information click here

NAPA Easy-Pay

Manage your account and bills securely, and find out how you can make a bigger purchase far more manageable here!

Click to apply

Full Auto Repair Services


Muffler & Exhaust
Brake Repair
Engine Repair
Oil Changes
2Y/24K Mile

Warranty Available

Key Drop


Credit Cards



Service Available


McDonalds & Starbucks