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Tech Talk with Master Power Brakes

Will a Disc Brake System Fit My Car's Wheels?

Posted by mpbrakes1 on Jan 24, 2017 11:38:19 AM

Wheel fitment is a huge concern when doing a disc brake conversion. Will my stock wheels fit? What wheels do fit and what wheels don’t fit? These are all very good questions. In fact, we received an email just the other day from a potential customer and he was asking these very questions. Well, we have a tool that can be used to provide these answers but unfortunately people don’t seem to know about it or are not sure on how to use it.

So what is this tool? It is a very simple wheel fitment template. Our R&D department has created a template that is application specific and available for our most popular kits with more and more coming down the road. The template gives a cross section of the disc brake system that can be placed within the wheel to determine if adequate clearance is available. The use of it is very simple and if you’ll read a little further, we’ll walk you through it and give some pointers.

The first step is to find the appropriate template for your vehicle. When searching under your vehicle and you have either the Legend, Rallye or Pro Driver system on the screen, look for the “Template” tab underneath the main product image. Within this tab will be a template for your application. If you don’t see anything, don’t hesitate to give us a call. We may actually have one and have forgotten to load it.

Once you find the template, print it out and grab some tape, a ruler, a pair of scissors and a hard piece of paper (a manila folder or construction paper works well). This next step is very important, make sure your printer settings are correct and the template prints to actual size. If it doesn’t, you will not get an accurate determination of proper wheel fitment. On each template is a guide that will allow you to check. Simply place a ruler against it and you will know immediately.

With the template printed and sizing verified, the next step is to remove a wheel from the vehicle. A rear wheel should work but we would recommend pulling a front wheel and tire off just to avoid anything that might bite you later. On the backside of the wheel, measure the center wheel opening. This will determine where to cut the template. In the picture below, you will where we highlighted this in green and the line to cut.

Place the template on whatever heavier paper you have available, attach with tape or glue to keep it from moving and cut the perimeter of the template. This will provide a nice semi-rigid template that can be placed within the wheel.

In the example shown, the wheel used does have adequate space to allow the disc brake conversion kit to work. It is recommended that the template have approximately an 1/8” of clearance between the template and the wheel. This should allow everything to move and function without any issues.

If you determine that the conversion kit won’t fit, there are still some options. A wheel spacer can be used to provide the necessary clearance. Washers can be used to move the template away from the wheel to provide the needed space and to provide the visual you need. Remember, when a spacer is used to gain clearance inside the wheel, you lose room on the outside. Put the tire and wheel back on the car and take a look between the fender and the tire to see if you have the needed space. In addition, check all possible areas of interference.

Hopefully this will help remove one of the questions from the equation when deciding to purchase a disc brake conversion kit. As always, if you have any questions, don’t hesitate to give one of our sales and technical service representatives a call. They are there to help you!

Topics: disc brake conversion guide, wheel fitment template guide, disc brake system fitment, Drum to Disc Brake Conversion

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