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02-06-2023, 07:43 PM | #55 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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between your thread and my perpetual needing to re-adjust the drums..has got me re-thinking disc rears...
now hear me out...stock front yaris rotors put on the rear using XB rear calipers..i belive i could keep my 14inch aluminum wheels..the XB rear calipers solve the E-brake issue without the need for a drum hat rotor....tho i suspect id need an adapter mounting plate similar to yours but 1/4 inch of more offset in the rear of a stock yaris drum beam would square up the wheelbase nicely |
02-06-2023, 08:25 PM | #56 | |
Drives: NCP90 TRD Yaris Manual Join Date: Oct 2022
Location: Auckland, NZ
Posts: 267
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Quote:
Yet another amazing New Zealand build here but this one they show you how they modify there BB to increase track width by just attaching the same tabs as the brake caliper version had. |
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02-07-2023, 11:29 AM | #57 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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Quote:
How would the xB's rear caliper mount on the rear axle frame? Or are you swapping out the axle frames? |
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02-07-2023, 11:50 AM | #58 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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02-07-2023, 12:01 PM | #59 |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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Ultimately…
I the end, here’s what mine will look like:
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02-07-2023, 12:49 PM | #60 | |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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Quote:
and like you said the bonus is having the caliper be the hand brake and not have a set of drums under it and the second gen XB calipers are setup exactly like that and will sit over the yaris front rotors perfectly....the trick becomes mounting and i "think" there may be a solution to not using a spacer and just welding the caliper mount directly to the beam, its a question of how well the alignment sits for doing so |
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02-08-2023, 07:20 AM | #61 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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02-08-2023, 12:37 PM | #62 | |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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im hell bent on keeping my 14 inch wheels....but finding a way to make a rear disc fit is looking really good right now...i have to re-adjust the rear drums every month bonus is i allready have another set of front rotors sitting waiting |
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02-08-2023, 01:15 PM | #63 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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Quote:
Seeing some's rear disc conversion like Compeer, who also has a set of 15" wheels, shows how close the caliper gets to the rear wheels. The stock front rotor size for none SE are 255mm, the rear rotors are 259mm. The rear calipers are smaller and seem to have a lower profile than the front calipers, so the rear disc conversion might still work for 14" wheels. If you don't have ABS, you'd have to get a brake balancer/proportioning valve for the rear line, since the rear disc will be bigger. Ditch using the front rotors for the rear, buy rear disc from RockAuto, I think they were $20 each when I bought mine. |
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02-09-2023, 01:22 AM | #64 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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curiosity why not use a set of fronts?..ive got matching set on the shelf drilled/slotted that i could use...and it seems to me if you had matching front/rear rotor size youd have less brake bias issues..sure youd still need the prop valve and to tweak it to perfection but there would be a whole lot less need to compensate with matched size on all 4...heck i bet you could balance it out some more by useing a "softer" pad in the back than the front
i can get full lock out of the fronts if i really REALLY get on it tho its useualy just 1 not both, so adding brakeing to the rear would be glorious..but im not losing my 14s...so im looking for a solve..and i think youve solved "most" of it also looking at getting a toaster!..a gen1 xb and i know thats the same parts under it and 14's are most likely what will be on it as well...so if i can make this work on the yaris it would be the same parts on the xb |
02-09-2023, 08:55 AM | #65 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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02-09-2023, 04:39 PM | #66 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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i was eyeballing the second gen XB rear calipers with built in hand brake
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02-09-2023, 06:07 PM | #67 |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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Which xB, the 2nd GEN? Those rotors are bigger, 279mm, and only 10mm thick. The Yaris front rotors don't fit in the Corolla/Yaris rear caliper by the way. It's too thick. Sorry no pic, I just got home, and it's already dark outside. The MR-2 rear caliper might work for what you're trying to do, but you're modifying the parking brake cable to make it work.
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02-09-2023, 06:15 PM | #68 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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oof yeah i didnt think about the thickness..tho your right the mr2 rear caliper looks serviceable
if i could find a "solid" rotor that was thin enough and similar DIA as the yaris fronts that would be ideal but im not sure such an animal exists in the 4x100...the alternative would be to get someone to "mill" down a set of the rears your using down to the same dia as the yaris fronts..but id really like it to be as "off the shelf" as possible let me know what the max thickness a rolla calipers will fit ?...a bit of digging shows that a possible solution may be mazda miata mx5 rears 251x9mm thick correct center bore..its a question of offset and hub at that point Last edited by sh0rtlife; 02-09-2023 at 06:34 PM. |
02-09-2023, 08:40 PM | #69 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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02-09-2023, 09:11 PM | #70 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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5mm when your on 14s is ALOT lol when your talking about bigger calipers
i just made note than an 03 prius..uses 255mm rear rotors...prius rotors and calipers should clear, at that point its mounting them..and any weirdness with the hand brake cables how are you handling the brake cables anyway |
02-10-2023, 08:30 AM | #71 | |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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02-10-2023, 03:10 PM | #72 |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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I just realized I could run just one long rubber hose per side to the rear calipers instead of having multiple couplings. I’ll buy the Corolla rear brake lines and see if they’re long enough.
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