Alternative rear disc conversion?

[remcafee]

sometimes you gotta give them a good smacking with a hammer, but as long as the 4 bolts are loose it should come out

[Neinris]

Looks like the LKQ near me near me just added a 2015 Corolla in their inventory. I'll check if it has rear disc brakes while I'm there trying to grab other things. Stay tuned!

[Neinris]

Ok... So the 2015 Corolla has rear disc brakes, I took them off and hid them for now... I bought just the right splash guard for now. I guess we’ll test fit this weekend, and if it works, then I’m off to grab the rest of them, I was even careful to remove the e-brake cables, I hope those will work as well. Crossing my fingers!!!

[06YarisRS]

Great work! Can't wait for the outcome.

[enviri]

that bolt pattern looks almost square....im already worried. lining it up via photoshop (i have a spare rear hub) made my assumption worse.

[Neinris]

I took more pics and made it as parallel the the plate as I can, as you all know, the image can get distorted if not taken perfectly squared. I also made some measurements, I’m probably off by +|- 3mm, but I eyeballed the center of the holes the best I can. Can you take measurements?

[enviri]

ooo a digital caliper. so fancy.

[enviri]

pics may be too big?

[Neinris]

Originally Posted by enviri

ooo a digital caliper. so fancy.

It's actually garbage, got it from Auto Zone, didn't know it's made of plastic. Sigh...

[enviri]

i might have a caliper in my trunk, but then i have to carry my 1nz head OFF the trunk...meh.

[Neinris]

Originally Posted by enviri

pics may be too big?

Hmmm... it's not looking good.
But I won't let that discourage me, I'll still do a fitment test. Crossing my fingers.

[remcafee]

hmmm its a completely different design than our yaris, the caliper mounting holes are part of the dust shield, interesting, it looks awfully thicker than the yariss hub from the side pics im thinking it may need to shim the hubs (assuming they fit) so that the rear disc brakes wont be dragging sice they arent at the right angle

[Neinris]

Originally Posted by remcafee

hmmm its a completely different design than our yaris, the caliper mounting holes are part of the dust shield, interesting, it looks awfully thicker than the yariss hub from the side pics im thinking it may need to shim the hubs (assuming they fit) so that the rear disc brakes wont be dragging sice they arent at the right angle

Sorry, I didn't get what you mean by it not being the right angle? Maybe you're talking about using the calipers from the Yaris SE? For this build you'd have use the calipers that came with the car, which is what I was planning all along.

Anyway, the difference how the Corolla and the Yaris bolts their rear hubs are that the Corolla's bolts comes from the back, the threads are on the hubs, while the Yaris bolts comes from the front, the threads are on the axle frame. I've tested the bolts that came with the splash guard, they thread in the mounting holes, and they're longer too. They have washer on them, which I'd probably remove to make sure they'd thread through all the way.

I just measured how thick the mounting face is, it's 11mm with the splash guard. Which means the wheels will stick out that much further. I'm fine with that, since the rear are tucked in more than the front anyway. If this works, the wheels will 6mm further than the front, 12mm total. According to this video, the front is 1470mm wide and the rear 1460mm, around 2:48 in the time stamp:

https://www.youtube.com/watch?v=GuEcY4RwS50&t=170s

I tried to remove the rear passenger hub after work today, but I got bested by it. I forgot to take measurements, I was in a hurry as I was running out of daylight. I'll buy two long bolts of the same thread size, nuts, and washers from Home Depot tomorrow, I should be able to safely back it out using the same method done in this video:

https://www.youtube.com/watch?v=7nj_KUkASxg

All in all, I just wish the center hole is the same size. If the mounting holes don't lineup, I'd probably get them filled with weld and drill the correct holes in them. Hopefully I don't have to resort to that.

[enviri]

there might be some shaving to be done to the dust shield around the top to fit the yaris axle mount indeed.. have fun!

[Neinris]

Well, I’m a little disappointed that the mounting holes didn’t lineup, not a single one, but the center hole is the same size so there’s still hope. I’m going to continue this project, but I’ll postpone it for now.

[enviri]

fill and redrill, find a machinist, mass produce. or make a hub spacer and screw the dust shield

[Neinris]

Originally Posted by enviri

fill and redrill, find a machinist, mass produce. or make a hub spacer and screw the dust shield

That's partially what I have planned. I'm going to fill the holes and redrill. If the center of the hub don't poke through the back, I'm going to mill down the back of the plate just a bit so that the center of the hub would poke through even just a bit, 3mm should be enough, so the weight is not on the bolts. I might wait to do all of that until I'm back in Maryland though, my friend has a mill, drill press, etc. That's why I'm putting this on pause. I am going to go ahead and get the rest of the hardware from the junkyard this weekend though, I don't know when I'd get the opportunity again to find the whole set. I'll even grab the ebrake cables to make everything easier on me when it's finally time to install. I'll revive this thread once I've actually installed.
I don't know about mass producing, I might just give out the template dimensions for everyone to get their own made.

[enviri]

ever seen the old penguin garage hub spacers? you can just do that and add ears.