GT/3.0RB/Spec B brakes

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GT/3.0RB/Spec B brakes

Postby Patientgreg » Wed Sep 02, 2015 9:37 pm

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!
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Re: GT/3.0RB/Spec B brakes

Postby Manaz » Wed Sep 02, 2015 10:07 pm

I have a set sitting in a drawer in my garage (rotors, calipers, I believe pads). Located in Sydney. Make an offer!
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Re: GT/3.0RB/Spec B brakes

Postby Patientgreg » Fri Sep 04, 2015 7:45 am

PMd, awaiting reply.
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Re: GT/3.0RB/Spec B brakes

Postby BillyCorgi » Fri Sep 04, 2015 9:27 am

Look here too!
viewtopic.php?f=19&t=30944
There also appears to be a set on OZFOZ according to Surge
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Re: GT/3.0RB/Spec B brakes

Postby Patientgreg » Fri Sep 04, 2015 11:35 am

Cheers mate, I actually have contacted that seller but I am only after the fronts and they aren't willing to separate.
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Re: GT/3.0RB/Spec B brakes

Postby Manaz » Fri Sep 04, 2015 3:00 pm

Patientgreg wrote: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!
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Re: GT/3.0RB/Spec B brakes

Postby Patientgreg » Fri Sep 04, 2015 6:36 pm

Cheers mate!
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Re: GT/3.0RB/Spec B brakes

Postby Manaz » Sat Sep 05, 2015 3:33 pm

Patientgreg wrote:Cheers mate!


And PM sent with details. If this sale falls through, I'll be putting them up for sale regardless.
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Re: GT/3.0RB/Spec B brakes

Postby dan_ashcroft » Sat Sep 05, 2015 10:20 pm

Patientgreg wrote:...unless you have the gen 5 rears.


Hi mate, what's the deal with the gen 5 rears, ie bigger/better?
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Re: GT/3.0RB/Spec B brakes

Postby BillyCorgi » Sun Sep 06, 2015 9:03 am

Here are the specs for the Gen 5 Brakes from the Factory Service Manual.
http://i.imgur.com/JpkvA8U.jpg
Get your Short Shift Adaptor viewtopic.php?f=68&t=30525
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Re: GT/3.0RB/Spec B brakes

Postby dan_ashcroft » Sun Sep 06, 2015 12:15 pm

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?
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Re: GT/3.0RB/Spec B brakes

Postby BillyCorgi » Sun Sep 06, 2015 12:36 pm

dan_ashcroft wrote: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.
Get your Short Shift Adaptor viewtopic.php?f=68&t=30525
Get your Gear Shift Rejuvenation Kit viewtopic.php?f=68&t=31240
Get your Centre Differential Rebuild viewtopic.php?f=6&t=31089
Want a custom built Brake Cylinder Stopper? viewtopic.php?f=6&t=31321
Need to hire a Guard Rolling Machine? viewtopic.php?f=6&t=31899
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Re: GT/3.0RB/Spec B brakes

Postby Patientgreg » Sun Sep 06, 2015 7:01 pm

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.
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Re: GT/3.0RB/Spec B brakes

Postby dan_ashcroft » Mon Sep 07, 2015 8:42 pm

BillyCorgi wrote:
dan_ashcroft wrote: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!
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