Help is just a click away!
Click here to chat with a Speedway Team Member
Online - Chat with us!
Products to Compare (max of 3)
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Customer Service
Since 1952
Talk to the Experts. Call 800.979.0122
Shop By
Street Race Truck More... The Toolbox

Business in the Backpart

Business in the Front!? And.. Well Business in the Back!

I can honestly say that it has been awhile since I have tried something entirely new. I mean, I am a creature of habit. I like certain things A LOT and I focus on those certain things, at least until I am bored with them or adult responsibilities get in the way. Fortunately, for me at my age I have learned to LOVE those things and stick with them. Why switch up what I already know and like? I’ll tell you why!

I haven’t had the opportunity to do rear disc brakes on anything being that I mostly deal with old hot rods that don’t make a ton of power. I don’t even like disc brakes on the front of my old hot rods. I think they look silly compared to big ole awesome drum brakes on I beam axles.

I do however think disc brakes have their place in the Hot Rod world for sure, especially with all the big motor swaps that go into some of them. Disc brakes offer several advantages to drums and for some builds they fit the bill!

What’s awesome about this project is that it gave me a little trouble like almost every single project I tackle. Believe it or not I embrace projects that fight back. We pretty much already know that failure can be one of the greatest teachers. I barely remember projects or portions of projects that go together smoothly. When I fail I ALWAYS, I mean SOMETIMES, remember what happened and learn from it. Other times I have to screw it up 2-4 times before it's beat into me. I try to not let that happen!

When we originally started talking about running four wheel disc brakes on my buddy Joe’s Model A, I started thinking to myself…"Man I have installed a lot of different hot rod parts and built several different things. How could this rear disc brake kit go wrong?". I checked out the instructions on the Speedway Motors website and the job seemed simple so I ordered it up to try it out.

From the beginning this whole project kicked back a little bit. We were told this was a 9” Ford rear end when we purchased it second hand. I honestly had no idea there were so many different 8” and 9” rear diffs out there. I ordered up Speedway's Ford 9" Rearend Bolt-On Rear Disc Brake Kit and started putting it together. Nothing was lining up or fitting right.

At first we thought if we grind it or take a little meat off, it would work. We didn’t feel good about doing this and started looking at things a little closer. Turns out this kit had the car bolt patterns in it! We wanted the 5 on 5.5 bolt pattern as we already had wheels and we did not feel this kit was the one for us. A simple measurement of axle flanges and offsets could have told us what we had, but we thought we knew what we had. Measure 2 times order parts 1 time!

A little bit of investigation turned up the fact that we had a TRUCK rear housing! Aha! Well, that makes a little more sense it wasn’t fitting and had the wrong bolt pattern. We boxed it back up nicely and I returned it. Speedway Motors return policy is really good. If it’s been less than 60 days, the product is in new resalable condition and has been placed in the factory packaging you are usually good to go. We found the Speedway 9” Ford Truck Rear End Disc Brake Kit. Awesome! Nope. Not awesome. At that time the kit was back ordered for two months! Just another kick to the you know what…and heck yeah the whole rear end was out of the car, old drums and axle removed so what better way to sit for 2 months!

I figured this would make Joe just say forget it and put the drums back on with some new guts. We are however basically building the whole entire car, we had a lot of work to put into other areas of the car so we aborted ship and patiently waited for the kit to come back in stock. When the kit came back in stock we proceeded where we left off. The excitement fires up once again!

We cut the tape and unboxed the kit like it was Christmas!! This kit was very nicely packaged and I was impressed at the quality of the pieces included in this kit. I read the instructions for about the 20th time. I read them out loud so Joe and I were on the same page! The instructions were pretty straight forward but I would say some of the information you need to complete this kit was missing.

The missing information was not anything more than what it takes to complete about any kit. What I mean by that , is the instructions to most of our kits are going to explain how to install something on a particular part of your car and it is only known to work with whatever portion of the car it says it will work with. It does not take into consideration that parts can change over the years or the fact that we sometimes get misinformation when we buy parts second hand and that in the 50-60 years of somethings existence it could have been messed with in a way that may not be noticeable by the untrained eye.

After the drum brake setup and axles are removed from the housing. You will select a spacer and primary bracket that fits your application. This kit covers a few different rear ends with multiple back spacing. We found that there was only 1 set that worked with our rear end. The other brackets were kind of close, but not close enough to second guess which ones we needed.

We selected the spacer and brackets that fit our application. We started to fit these brackets onto the axle housing. At first they appeared to orient the opposite of the directions. We weren’t trying hard enough. We were under the impression that this kit would not require any modification to fit, but found out that there were a few minor things to do to get this installed correctly and orientated properly.

(we messed around with installing the brackets a few different ways)

What we noticed is that you can’t really test fit anything without taking the axle out each time so we got a work out fitting these brackets.

The pictures to the right show what we ended up with the first night. We had found that the orientation of the bracket was backwards from the directions and did not quite look right. The instructions show that you need to put the rectangular brackets in between the primary and secondary brackets to get the proper backspacing.

We could only get the round tube spacers to fit on the primary bracket and used the rectangular spacers to take up the end of the bolts. This didn’t feel right and we wanted it to fit like the instructions state it should.

After calling it a night and re grouping the next day we found that only a slight modification was needed to make this brake kit install correctly. The rectangular spacers to space the primary bracket from the caliper brackets needed enlarged to fully seat and not bind when tightened down

The other mild modification needed was to slightly grind the rectangular brackets to fit around the brake flange. When we originally mocked this up this seemed like it was going to need to have the brake flange ground and the rectangular spacers that was not the case when we had everything mounted correctly and tight.

When the rectangular spacers were ground down to fit onto the brackets, all the parts installed like they should and everything at this point made sense! ? I am extremely happy with this kit and feel as if it is worth every penny. We repeated it on the other side and now we are ready to install some brake lines and get it back in the car!

Products Featured in this Article

Related Articles

Disc Brake Conversion
by Tyler Wesely - Posted in Tech
How to change brake pads, rotors and calipers using the Mustang II complete brake kit. Replace your drum brakes with disc brakes for performance and better braking ride. For use on Bobcat and Mustang II spindles.
How to Build 4-Link Bars
by Speedway Tech Team - Posted in Tech
Do you have a project that will require you to build your own 4-link bars? Here's a demonstration on how to determine the bar length, weld the parts and assemble the links using steel tube ends weld bungs and forged 4-bar rod ends.
Upgrading Your Air Cleaner Assembly
Learn the proper steps in upgrading your air cleaner assembly to ensure clean air, allowing your engine to more easily make the power that it should.
Take a Kid to a Car Show
by Jeff Karls - Posted in Street Rod
What is it like growing up going to car shows? This story explains how attending car shows is a way of life and how the tradition is passed on from generation to generation.
Ignition Upgrades for Classic Mopar Muscle
by Tyler Wesely - Posted in Street Rod
Bringing an old Mopar back to life isn't always a breeze. Fortunately, MSD has come up with a solution for those outdated and unreliable points-type ignition systems. Find out how to install a MSD 8386 distributor and MSD 5531 spark plug wires
Installing Radiator Support Rods
by Heath Petzoldt - Posted in Tech
We all need a little help from time to time. In this case, we had a grill shell on a 1946 Chevrolet Truck that could use some stiffening. Ride along as Heath installs support rods and rod brackets.
Car Show Planning 101
by Heath Petzoldt - Posted in Tech
Do you have the 'car bug' and love to attend car shows or racing events? This article gives an overview of what all goes into planning a show and tips on how to get started.
Installing Insulation & Loop Carpet on a Car Floor
by Darrian Wedding - Posted in Tech
Learn how to install insulation and loop carpet on a car floor to improve the appearance, reduce noise and heat impact, and enjoy driving your car even more.
Keeping your 1955 Chevy Cool
by Zach Raddatz - Posted in Tech
Shortcuts don't always pay off. Zach Raddatz walk us through his experience with a cheap radiator so we don't make the same mistake!
'32 Ford Hot Rod
by Joe McCollough - Posted in Tech
Look up "hot rod" in the dictionary and you'll see a picture of this car.