piehole1983

iTrader: (7)

Would I be correct to say that if you fit Brembo calipers and use the WRX brake booster you would in fact have the maximum braking power achievable with these components?

zGb

from what johnfelstead said, i understood the same thing as you did...this is very interesting

Jay Cartay

iTrader: (3)

Yeah, sounds like my 53 plate Blob WRX with Brembos should be as good as it gets with these brakes going by that.

Thanks John, very helpful indeed.

johnfelstead

What you have to bear in mind is the effect on brake balance.

If you don't match the required line pressures front/rear you will end up with too much front brake bias, which is a bad thing, as you make the car nose dive more and reduce the amount of overall brake traction available, so although it feels like the brakes are brilliant, you are in fact reducing the cars braking performance.

The ABS system in the car has a G sensor that is using the amount of chassis dive to modulate the rear brake line pressures, so if you get a mismatch you may find the ABS system doesn't work as well as could be the case with a matched instalation.

What you really should be doing is using a matched brake setup front/rear, if you install a Brembo front setup on a WRX you are going to put a lot more front brake bias on the car as a result. I could work out the bias change fairly easily.

johnfelstead

The other thing to bear in mind is brake pedal travel. The Brembos are designed with a larger master cylinder in mind, if you use those with a smaller WRX master cylinder as fitted to the later cars, you will get a longer pedal because you have to provide more fluid to operate the caliper pistons.

piehole1983

iTrader: (7)

How would this affect the UK Turbo classic? My plan is to fit Brembos all round (already have them) and completely remove the ABS as it is frankly dangerous. I also have a bias valve that could go in if required. I had planned to keep the OE bias valve in circuit. Do you, John, have any manuals that give information on the UK Turbo classic? I believe it's the same as a European GT model.

johnfelstead

I have the manuals with the brake specs for the 93-96 models.

piehole1983

iTrader: (7)

Mine is the 97/98 model, the biggest pain in the *** built!

johnfelstead

piehole1983

iTrader: (7)

Could you have a look at the older models please and see how they compare to the newage? I'll see if I can get some part numbers from the Opposed Forces website to see if my parts appear on other models.

johnfelstead

93-96 Turbo has a 25.4mm master cylinder and a proportioning valve that limits rear line pressure at 0.4:1 ratio above 284psi, with an effective brake booster servo of 180mm+205mm. Calliper piston effective diameter at the front is 42.86mm, rear 38.1mm.

With 66lb of pedal pressure, and ABS equipped 93-96 turbo will have 1321psi line pressure in the front system.

joz8968

iTrader: (13)

He's into it.

Jay Cartay

iTrader: (3)

I've got the Brembos front and rear on my 53 plate car. Should all be fine, no?