Looking to do a rear disk brake conversion. Need help sourcing parts. - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 7th Generation (1993-1997) Specific discussion of the 7th generation

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post #1 of 9 Old 04-19-2019, 01:35 AM Thread Starter
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Looking to do a rear disk brake conversion. Need help sourcing parts.

The rear drums on my car is pretty much shot from warped drums to leaky wheel cylinders and needs everything to be replaced. Seeing how I need to replace all the components on the drums, I figured that it would be a good idea to convert my car to rear disks. I know the "The front brakes does most of the braking on a FWD car." argument, but I really like the braking feel when on snow or gravel on my Mazda 3 and my mom's Civic, both which has rear disks. My issue is that I've searched the internet and it seems that information is difficult to find. I've seen that the most common way is to import rear disks from an overseas Corolla, but I'm not sure where to source the parts, and I'm worried about sourcing replacement pads and rotors in the long term. The other method seems to be pulling the rear brakes off a Celica, but I'm not sure what model years to look for. My other concern with the Celica brakes is that it seems that I need to do some drilling to convert it to 4 lug. Can I just swap over the hubs and simply run 5 lug wheels on the rear?
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Last edited by patx35; 04-19-2019 at 01:40 AM. Reason: Recent TN forums issue
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post #2 of 9 Old 04-19-2019, 03:39 PM
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Would be easier to do 5-lug conversion at same time. Some related threads:

https://www.toyotanation.com/forum/1...placement.html
https://www.toyotanation.com/forum/1...ed-states.html
https://www.toyotanation.com/forum/1...onversion.html
https://www.toyotanation.com/forum/1...-ae-202-a.html
https://www.toyotanation.com/forum/1...onversion.html

Site with great diagrams and parts listings with part#
https://www.megazip.net/zapchasti-dl...-bkpgka-915404

Then youíll want to break out calipers and measure whole bunch of cars at breakers.
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post #3 of 9 Old 04-19-2019, 03:49 PM
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I don't know if it disappeared, but I remember there being a good DIY and parts list for this but I can't find it.
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post #4 of 9 Old 04-19-2019, 06:29 PM
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I found one in web-archives: CorollaCarClub-DIY Rear Disc Brake Conversion Corolla 93 - 97
https://www.toyotanation.com/forum/1...-problems.html

Use parts from 88-92 Corolla GTS, which came with rear disc-brakes or 90-92 Geo Prism GSI.
Don't forget to obtain brake proportioning-valve from those cars as well.
Looks like you have to weld on piece to spindle.

Here's one using Celica parts:
http://web.archive.org/web/201803011...or-needed.html
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post #5 of 9 Old 04-20-2019, 04:50 AM
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The Hulk (green show car) had rear brakes from a 90s Camry I believe. He pressed the 4 lug hub in from the Corolla and gets the discs redrilled.
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post #6 of 9 Old 04-20-2019, 04:31 PM
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video

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post #7 of 9 Old 04-21-2019, 11:14 AM
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Quote:
Originally Posted by DannoXYZ View Post
Excellent video, but did he address the master cylinder and proportioning valve? I've always thought that you needed to do that, as drums utilize some sort of check valve or something in the master cylinder, which disks don't - or vice-versa... Pretty sure that the proportioning valve is different also, for disk applications.

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post #8 of 9 Old 04-21-2019, 11:25 PM
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I should've added above that I would want to try to use the master cylinder and proportioning valve from the donor Celica.

2000 Corolla CE. 1ZZ-FE, 4 speed automatic
1988 Mustang GT 5.0. 5 speed, lots of mods
1977 F150. Big straight 6, 3 speed manual on column
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post #9 of 9 Old 04-22-2019, 04:12 AM
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Prop-valve more important as it does balancing between front & rear based upon input pressure.

Master not as important as it only affects overall leverage between pedal force vs. caliper force. Larger master would give firmer pedal with less travel but less caliper-clamping force. Smaller master yields softer pedal with more travel and more caliper-clamping force.

Either way, itís still balanced by prop-valve. Should definitely get from donor car. Interestingly enough, proper prop-valve for rear discs reduces pressure going to rear more than with drums. This is due to rear calipers having larger pistons than drums.
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