Alternative rear disc conversion?

[sh0rtlife]

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

[Compeer]

Originally Posted by sh0rtlife

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

http://www.speedhunters.com/2019/04/...ng-conversion/

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.

[Neinris]

Originally Posted by Compeer

http://www.speedhunters.com/2019/04/...ng-conversion/

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.

Nice! But that rear disc conversion uses the drums for the parking brake. My conversion uses the discs as the parking brake.

[Neinris]

I the end, here’s what mine will look like:

[Neinris]

Originally Posted by sh0rtlife

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

If you didn't know, the front wheels' track are wider than the rear by 10mm (5mm on each side), adding the 1/4 inch plate will make the rear 2mm wider than the front (1mm on each side).

How would the xB's rear caliper mount on the rear axle frame? Or are you swapping out the axle frames?

[sh0rtlife]

Originally Posted by Neinris

If you didn't know, the front wheels' track are wider than the rear by 10mm (5mm on each side), adding the 1/4 inch plate will make the rear 2mm wider than the front (1mm on each side).

How would the xB's rear caliper mount on the rear axle frame? Or are you swapping out the axle frames?

the issue i ran into when looking at the XA brakes..is the fact that they are all drum in the states but disc elsewhere in the world.....annoying at best

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

[Neinris]

Originally Posted by sh0rtlife

the issue i ran into when looking at the XA brakes..is the fact that they are all drum in the states but disc elsewhere in the world.....annoying at best

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

Once I get to mounted and tested for a few months I’ll let you know if there’s any mounting issue. I’m also planning on making another mounting plate for the Yaris SE caliper, which are clocked different than the Corolla calipers.

[sh0rtlife]

Originally Posted by Neinris

Once I get to mounted and tested for a few months I’ll let you know if there’s any mounting issue. I’m also planning on making another mounting plate for the Yaris SE caliper, which are clocked different than the Corolla calipers.

your running the bigger rotors tho right?...i might be intrested in a set of plates from you even if i need to modify them slighty

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

[Neinris]

Originally Posted by sh0rtlife

your running the bigger rotors tho right?...i might be intrested in a set of plates from you even if i need to modify them slighty

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

I do have the bigger rotors up front from the later model Yaris SE if that's what you're asking. I don't think they'll fit in 14" wheels, they barely fit in my 15" wheels.
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.

[Neinris]

Originally Posted by sh0rtlife

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

What issues where you having that you had to re-adjust your drums often? Apparently my drum brakes would over tighten themselves over time, and was causing a bit more of a drag than normal. With the disc brakes, I noticed that I'm able to accelerate a little bit more quicker now, and my MPG has gone up from 31 to 31.5 in just two days!!! That's with my "normal" driving. We'll see how much better it'd get by the end of the week.