Brake upgrades

[mojoyaris]

cool

[ChinoCharles]

Hub conversion?

5 lug?

Any takers?

[brickhardmeat]

endless array of wheels

[majorposer]

4x100 is pretty popular. my other car has 5x100, and there isn't as much. isn't there a rear disc upgrade for the xa/xb?

[mojoyaris]

I hear that there may be a rear disc conversion by JBT, but not 100 percent sure. I'm getting the mini bbk system by JBT with 11 in rotors. I hear they pull pretty good and the 4 pot 13 in kit was just too large for the Yaris.
Weight is also a factor.

I guess I'll have to wait for that rear RS suspension from the junk yard in Japan.

[Vanderkitten]

I was thinking of the Jetta as well... aren't the MK2 GTI's a 4x100? Maybe even the MK3's? Not that I have time to tinker, but the Jetta has a really similar rear suspension set-up.

[Terrorize]

Hmm..my Yaris sedan has EBD apparently...how can i tell???
Up here in Canada..it was optional...but the package i chose supposedly has it...

Originally Posted by Moose

That's what I was thinking. For mostly daily driving, though, there are other ways to drastically improve braking without dumping $1000 into a new rear end.

For instance:
-upgraded pads for the front brakes
-stainless steel brake lines (the best upgrade, IMO)
-higher temperature brake fluid (I've had great results from Motul)
-upgraded master cylinder (back to that money thing, though)

Remember, you may actually lose braking power (and thus, take longer to stop) by switching to rear disc brakes- vehicles like ours do not have EBD, and the "old style" proportioning valves are set up for drums- you can get around this by swapping out the master cylinder and lines, as well- but, oh the $$$ you'll be spending! Drums are lighter, too, so there's less unsprung weight.

[mojoyaris]

Still waiting for my brakes, JBT emailed me and I informed him that I'm getting them from him through my tuner guy in Richmond. In the meantime, I picked up a set of Megan gauges, header and oil catch tank.

So I figure they'll all be installed at the same time.
Hoping I get the call tomorrow for the install.
I also ordered two Falken 615's since the last autocross chewed out my front tires (pressure too low).
I'm also picking 4 Falken 615's from a friend who never really got to use them. I just need rims for them next.

[churp]

Disk brakes require a 2-4 pound residual pressure valve while drums require 7-9 pound----these are usually screwed into the master cylinder where the line comes out (take the lines off the master cyl, insert the proper tool in the hole, and take out the residual valve). The hot rod market can supply external residual valves and adjustable proportioning valves that can be put inline to cure any the rest of the problems. .....without changing the residual valves, adding disks to the rear, the rear disks will have too much pressure retained on them when you let off the brake and will warp all to hell, I know because my RX7 was converted before I bought it without changing the residual valve!!!!! The location of the residual valves isn't always in the master cylinder, so if anyone knows for sure, please post. The proportioning valve isn't always required but is a good idea.......you would have to spend time on a good cement/blacktop test area trial and error testing to get the proportioning valve (adjustable) to work correctly. Check the hot rod magazines/forums out, the oldschool guys have been doing this for years and lots of brake suppliers (at least hot rod) know a lot about this and make the custom parts.
Personal experience I haven't done this...so flame away. I have a parts RX7 that has 4 disks so I'm just switching master cylinders (easy way out). My 62 dart I switched from the single line master to a dual, while retaining my 4 drums, and it does matter if you put the drum-drum master or the disk-drum master in because of the residual valves.


If you have ABS you have another bag of worms.....this is for none ABS.

[Vanderkitten]

These are by no means a bolt on, but an SCCA Miata buddy of mine said the mid-80's BMW M3 rear discs are 4x100, and the hot set-up for Miata swaps and thought it would be something worth investigating for the Yaris.

The other idea was the Mini Cooper since they are also 4x100 and have 4 wheels discs.

When I can find time, we're going to look into it further.