Brake Upgrades

**Joshstix** · 25-07-2007, 11:51 AM

Currently I am running Gen3 SW20 rear calipers with AW11 front rotors on therear of my AW11. They need a spacer between the hub and rotor.

**Mooro** · 25-07-2007, 12:20 PM

Sweet...sorry to go off topic Koffee.

**Koffee-Black** · 25-07-2007, 12:25 PM

thats cool, its all relevent!

How hard is it to hook up a poprtional valve? is thatbasically a brake bias?

**Mooro** · 25-07-2007, 12:44 PM

Yep allows you to adjust the brake bias...you still want it to be adjusted such that the fronts will lock before the rears with some margin of safety, cos a rear brake lock up can be difficult to control.

Not sure how hard it is but from reading up briefly on it it is something that should be done with care to do it correctly. I believe the factory system is setup with multiple systems so if one fails/leaks you still have some braking power but an incorrectly installed proportional valve can stuff this up which is obviously bad.

Also I believe they are illegal...well at least an in cabin one is but maybe an external one will be ok.

**Joshstix** · 25-07-2007, 12:57 PM

Just installing a proportioning valve is fairly simple, it's just a case of cutting and bending the appropriate brake line to fit into the valve then slipping on the appropriate ends and flaring the pipe and bolting it up.

Setting it up correctly on the other hand is a lot more work. Running an aftermarket proportioning valve along with the factory proportioning setup is going to lead to problems as well.

Currently my MR2 is setup with the factory proportioning valve completely removed, I have replaced it with a T piece and a straight connector. Even with this setup with no proportioning it is far to easy to lock the front brakes.

**IN 05 NT** · 25-07-2007, 10:15 PM

oh yeah, i forgot that the MR2 are rear engined, bahaha, that be the case, a rear upgrade would work nicely due to the added weight over the rear,

**bigpitty1** · 03-12-2007, 12:11 AM

I've got a 1990 MR2 GT I want to put the later modle SW20 MR2 discs and calipers on as they are bigger, is it just a simple swap or am I going to have to make some brackets to fit the calipers.

**Joshstix** · 03-12-2007, 10:56 AM

The Gen3 parts will bolt stright on to the early SW20 hubs. If you don't replace the master cylinder then you will likely have a longer pedal throw than before.

**celicapain** · 03-12-2007, 02:07 PM

Regarding legailty In victoria you can use an adjustable proportioning valve, providing the bias is locked and cant be changed without tools or when the car is moving. the car is also subject to engineering approval if your doing this.
Dont know about the other states.