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Old 04-27-2020, 11:50 PM #1
midcoma midcoma is offline
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Rear Disc Brake Conversion Kit - Coming Soon!

I've been working on this project for a few years and finally had some time to get serious about it. The design is complete and fabrication is in progress.

This is a bolt on kit to replace the rear drum brakes with disc brakes.




What's included:

- Conversion brackets & spacers (1 pair for 1 axle).
- All hardware to mount the bracket to the axle and the caliper to the bracket.
- Brake line adapter to connect the factory brake line to the caliper.


What's required:(details below)

- '94-'04 Mustang Cobra rear calipers & caliper mounting bracket.
- '94-'04 Mustang Cobra rear brake pads.
- 2003-present 4Runner rear rotors.


CAD Images:










The Brackets:

The brackets are laser cut from 3/8" A36 steel. The spacers are also laser cut from A36 steel to match the brackets. Both the brackets and spacers are Zinc Yellow-Chromate plated to prevent corrosion.

The brackets are designed to fit the factory 4Runner axle housing with ABS.

The spacers are required to get the proper offset for the caliper mounting bracket. They allow the rotor to fit properly in the caliper mounting bracket.


Pre-Order:

From my first run of these, I have 10 sets available. I expect to be able to ship them sometime in the second half of May. Price for the kit is $160 shipped.

If you'd like to claim a set, comment and I'll add you to the list. Also comment if you're interested in a parking brake kit to connect the calipers to the factory hand brake.

1. powerman83 (parking brake kit also)
2. RandyBobandy (parking brake kit also)
3. 2TH4IST (parking brake kit also)
4. zacattack20 (parking brake kit also)
5. weekendclimber (parking brake kit also)
6. prezioso70 (parking brake kit also)
7. Blackdawg (parking brake kit also - Tacoma)
8. MattJakobs (parking brake kit also)
9. louieloui.e (parking brake kit also) (Instagram)
10. Hopkins (parking brake kit also)
11. eimkeith (parking brake kit also) (already accounted for due to his assistance with bracket prototyping)

Run 2:

1. ACE115 (parking brake kit also)
2. theesotericone (parking brake kit also)
3. Twan (parking brake kit also)
4. AntonioCm1983 (parking brake kit also)
5. itskmill06 (parking brake kit also)
6. PandaRescue89 (parking brake kit also)
7. Twitchstyle13 (parking brake kit also)
8. mcaz5 (parking brake kit also)
9. AdjustedTimmy (parking brake kit also)
10. atcpup (parking brake kit also)
11. AntsyMo (parking brake kit also)
12. coleworld427 (Instagram)
13. chris.yvr (parking brake kit also) (Instagram)
14. Dinhy34 (Instagram)
15. Jarods7920 (parking brake kit also)
16. Grgg1978 (parking brake kit also)
17. G’s_4runnah (parking brake kit also)
18. nick_who_has_2_dogs (Instagram) (parking brake kit also)

Parking brake kit only:

1. rexassian
2. Rcastle

*Bold text is confirmed parking brake kit*


Parking Brake Kit:

The interest in a parking brake kit has actually been over 100% of the people interested in the brackets. So with the overwhelming demand I've spent the past couple days trying to gather the parts list and confirm availability from vendors. Coincidentally, it looks like the price for a parking brake kit will also be $160 shipped. This price is pending me getting all the parts in hand and verifying fitment.

The kit will include everything required to connect the parking brake in a way that I'm comfortable having my name associated with. Here's an example of what will be included.

- (2) brake cables for the Mustang calipers.
- Factory clips to secure the cable on the caliper.
- Junction bracket for the cables.
- Fittings to adapt the factory cable to work with the junction bracket.
- All necessary hardware (all 18-8 stainless steel).
- Spare rivet nuts, just in case you need them. Or if you haven't used them before and need to experiment before installing on your 4Runner. I also plan to provide the correct size drill bit.

I'll compile all the parts and modify them as necessary. Since it's a custom application, some parts need to be adjusted to work with each other and with the stock 4Runner parts. By the time you get the kit, it will be seamless and ready to install. The kit will be very similar to the pictures posted, with the only real difference being the way the cables are mounted behind the junction bracket. They cables will be secured to the bottom of the round tube that supports the rear of the gas tank. My cables are secured to the body of the 4Runner because I removed the tube for suspension modifications.


Future Kits Pending Interest:

- Brackets for ABS-delete (ABS axle housing with sensor removed).
- Brackets for non-ABS housings.

*Note: These brackets will work with ABS-delete and non-ABS housings, but I also have designs specific to those set-ups.

*****These brackets have not been tested/approved by the DOT and are recommended for off-road use only*****

Last edited by midcoma; 07-06-2020 at 12:05 AM.
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Old 04-27-2020, 11:51 PM #2
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What's Required

Calipers:

- '94-'04 Mustang Cobra rear calipers.

The Cobra part is important. The difference is in the caliper mounting bracket. The rear caliper itself is the same for all '94-'04 Mustangs. The Cobra came with a thicker, vented rotor. The caliper mounting bracket was different to allow more room for this thicker rotor. The 4Runner rear rotor is also vented. It needs the wider gap in the Cobra bracket to fit properly.

The easiest way to tell if you have the correct caliper mounting bracket is to look and see if the outside of the bracket is connected. If it is, you're good to go. You would think this is easy, but even the auto part manufacturers mess it up. I've purchased part #14-1042 from Cardone, BrakeBest, and Wearever. All of them have gotten it wrong. That is the part number for the correct caliper mounting bracket. Always open the box and look at the mounting bracket before you leave the store. It's about a 50-50 chance if the properly labeled box has the right part in it or not.

These are not my images, but they show the difference in the two brackets.






Brake Pads:

- '94-'04 Mustang Cobra rear brake pads.

If you want to make life easy, go with brake pads for a '94-'04 Mustang Cobra. The pad is slightly thinner to account for the thicker rotor. As mentioned, the caliper is the same. So in order to fit a thicker rotor in the same amount of space, the pads are thinner.

You can make pads from a non-Cobra work, but they will either be pretty tight until the get worn down or you will have to run them without backing plates/pads until they wear down a bit. They are much more difficult to fit and assemble than Cobra pads.


Rotors:

- '03-current 4Runner rear rotors.

When used with the Cobra caliper mounting bracket, these rotors fit great. The best thing about them is that they are a Toyota part and they don't need to be modified. The Montero rotors that have been used in the past have interference issues with the Toyota lug studs and the back of the rotor hat needs to be countersunk to correct the issue. This is not an issue with the newer 4Runner rotors. Everything fits without modification.

Last edited by midcoma; 04-28-2020 at 01:51 AM.
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Old 04-27-2020, 11:52 PM #3
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Brake Kit Background

I've been running version 1 of this conversion since 28JUN17. It was installed on my 4Runner when it was at 233,910 miles. It now has over 279K miles, so over 45k miles on the kit so far. I used the lessons I learned from my first kit to develop these brackets and I'll be upgrading to a set as soon as they're finished. The biggest thing I learned was the difference between the Cobra caliper mounting bracket and the others. My first set of brackets used the non-Cobra mounting brackets and it caused the tolerances to be very tight.

Here's a few pictures of the version 1 brackets after install.

You can see in this picture that it's the wrong caliper mounting bracket.




In this picture you can see how tight of a fit it is between the caliper mounting bracket and the rotor.







On 15JUL18, I finally got around to connecting the parking brake. I'm sourcing the parts now to be able to offer this as a kit for those interested.












Last edited by midcoma; 04-28-2020 at 02:44 AM.
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Old 04-27-2020, 11:53 PM #4
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Status Update

Picked up the first run of brackets from the shop today.




Test fitting:

Picture from inside with the caliper mounting bracket in place.




Caliper mounting bracket, spacer, conversion bracket.






Rotor and caliper mounting bracket.






With brake pads.






Now I have a 64lb box packed and ready to go to the shop for plating. How to make friends with USPS employees


Last edited by midcoma; 04-28-2020 at 12:26 AM.
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Old 04-28-2020, 12:51 AM #5
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What years work for the Mustang calipers? This kit, a line lock, and a t-case brake are probably in my future.
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Old 04-28-2020, 01:59 AM #6
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Quote:
Originally Posted by theesotericone View Post
What years work for the Mustang calipers? This kit, a line lock, and a t-case brake are probably in my future.
Details added above.

I recommend against a t-case brake. I ran one on my Tacoma for a while and it was a pain. Getting it set up was difficult and part availability was another problem. I can provide the parts to connect the parking brake of the Mustang calipers to the factory hand brake. I've been running that on my 4Runner for a while and it's much nicer than the t-case brake was on the Tacoma.
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Old 04-28-2020, 07:52 AM #7
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Quote:
Originally Posted by midcoma View Post
Details added above.

I recommend against a t-case brake. I ran one on my Tacoma for a while and it was a pain. Getting it set up was difficult and part availability was another problem. I can provide the parts to connect the parking brake of the Mustang calipers to the factory hand brake. I've been running that on my 4Runner for a while and it's much nicer than the t-case brake was on the Tacoma.
First and foremost, I applaud your work, and I appreciate it. Two questions, how smaller are these calipers than the tundra calipers? It would drive my OCD nuts if I knew I had little baby rotors on the rear of the rig. Second question is isnt drum brakes better for off road? Thats the excuse toyota uses to still put factory drums on all new off road vehicles today.
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Old 04-28-2020, 08:18 AM #8
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I'm in, and in for the parking brake kit as well.
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Old 04-28-2020, 08:37 AM #9
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I'm in also , and in for the parking brake kit as well.
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Old 04-28-2020, 08:56 AM #10
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Iím in for a kit and parking brake assembly


One question, do you need to upgrade the master cylinder for this kit? I have 199mm tundra brakes on the front
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Old 04-28-2020, 09:28 AM #11
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This bracket, right?
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Old 04-28-2020, 09:46 AM #12
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Quote:
Originally Posted by midcoma View Post
Details added above.

I recommend against a t-case brake. I ran one on my Tacoma for a while and it was a pain. Getting it set up was difficult and part availability was another problem. I can provide the parts to connect the parking brake of the Mustang calipers to the factory hand brake. I've been running that on my 4Runner for a while and it's much nicer than the t-case brake was on the Tacoma.
I appreciate the first hand knowledge of the t-case brake but I've done the research. It's what I'll go with. The less crap I have hanging off the rear axle the better for how I wheel my rig. I'm still debating if I really even need a line lock. I do really want one though. Having the ability to lock one rear tire and pivot off it would be almost as good as front digs. lol
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Old 04-28-2020, 10:07 AM #13
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I'm in as well! Also interested in the parking brake kit too. Can't wait for this!
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Old 04-28-2020, 11:33 AM #14
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For sure interested in the parking brake kit if you would consider selling that separately. But I have a question about the cable routing, would going down from the frame to the control arm and under the axle tube limit suspension travel? Thanks
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Old 04-28-2020, 11:38 AM #15
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I want it. Take my money. Iím in for the parking brake too.
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