GT/3.0RB/Spec B brakes

[Patientgreg]

Hi I'm after a set of the GT/3.0RB/spec B 316mm brakes. Only after a front set at the moment, unless you have the gen 5 rears. Will consider either calipers on their own or with a set of rotors. Located Newcastle, willing to drive to pick up or happy to pay postage.
Cheers!

[Manaz]

I have a set sitting in a drawer in my garage (rotors, calipers, I believe pads). Located in Sydney. Make an offer!

[Patientgreg]

PMd, awaiting reply.

[BillyCorgi]

Look here too!
viewtopic.php?f=19&t=30944
There also appears to be a set on OZFOZ according to Surge

[Patientgreg]

Cheers mate, I actually have contacted that seller but I am only after the fronts and they aren't willing to separate.

[Manaz]

Cheers mate, I actually have contacted that seller but I am only after the fronts and they aren't willing to separate.

My set are just fronts, I'll get you that info you asked for tonight!

[Patientgreg]

Cheers mate!

[Manaz]

Cheers mate!

And PM sent with details. If this sale falls through, I'll be putting them up for sale regardless.

[dan_ashcroft]

...unless you have the gen 5 rears.

Hi mate, what's the deal with the gen 5 rears, ie bigger/better?

[BillyCorgi]

Here are the specs for the Gen 5 Brakes from the Factory Service Manual.
http://i.imgur.com/JpkvA8U.jpg

[dan_ashcroft]

Thanks

Gen 4 3RB rear: 18x290mm disc, 82.4 x 33.7 x 9.0 pads, 38.1mm cylinder.
Gen 5 rear: 18x290mm disc, 95.5 x 34.8 x 11.0 pads, 40.4mm cylinder.

So Gen 5 have larger pads, but also have a larger rear cylinder which would change the balance? Larger rear cylinder would be less pressure on the rear?

[BillyCorgi]

Larger rear cylinder would be less pressure on the rear?

Sorry, NO.
Pad Force = Brake Fluid Hydraulic Pressure (Newtons per square millimetre) times cylinder area (Pi x Square D / 4). The result is Newtons or kilograms.force
So a larger diameter wheel cylinder will exert a higher brake pad force for a given master cylinder fluid pressure.

[Patientgreg]

I'm after gen 5 rears because these are going on my SH9 forester and gen 4s don't fit. Anyway, I've purchased a set of fronts, thanks to Manaz. I'll leave this thread up in case anyone is selling a rear set of Gen 5s.

[dan_ashcroft]

Larger rear cylinder would be less pressure on the rear?

Sorry, NO.
Pad Force = Brake Fluid Hydraulic Pressure (Newtons per square millimetre) times cylinder area (Pi x Square D / 4). The result is Newtons or kilograms.force
So a larger diameter wheel cylinder will exert a higher brake pad force for a given master cylinder fluid pressure.

Thanks for explaining that.

It's a shame that they aren't interchangeable as Patientgreg has pointed out. Good luck with tracking some down!