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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #1 · (Edited)
Having blown my second rear caliper piston in less than 2 years on the same side (driver rear), do I have any better options? Ive looked into the LNF rears but I cant find any straight answers anywhere on how to convert to them, other than a few 'I know how to do it but cant tell you specifically' things. Anyone have any suggestions?
Figured out that the G5 knuckle is the same as the LSJ so the LNF k̶n̶u̶c̶k̶l̶e̶ caliper should just bolt up
 

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #3 · (Edited)
Sorry, I meant the LNF caliper should bolt right up to the LSJ knuckle. I did some more digging and some people said they use a spacer for the LNF rotor to center it since the bore is slightly larger.
A̶n̶y̶o̶n̶e̶ ̶k̶n̶o̶w̶ ̶w̶h̶e̶r̶e̶ ̶I̶ ̶m̶i̶g̶h̶t̶ ̶f̶i̶n̶d̶ ̶t̶h̶o̶s̶e̶?̶ ̶O̶r̶ ̶i̶s̶ ̶t̶h̶e̶ g̶a̶p̶ n̶e̶g̶l̶i̶g̶i̶b̶l̶e̶ ̶s̶i̶n̶c̶e̶ ̶i̶t̶'̶d̶ ̶b̶e̶ ̶l̶i̶k̶e̶ ̶a̶ ̶m̶m̶ ̶o̶r̶ ̶2̶?̶
Center bore is the same, the misinformation/misdirection is real
 

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #4 · (Edited)

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #5 · (Edited)
After much digging and thinking, I believe I understand.
From - How do I determine proper brake disc size?
Bolded is added info, I'll add more info as I find it
The first couple describes the front brake disc.

AA: 15" 285mm (285×25 - Hub Bore 70mm)
AB: 16" 302mm (302x28 - Hub Bore 70mm)
AC: 16"+ 314mm (mounted on 2.8 V6) (314x28 - Hub Bore 70mm)
AD: 17" 345mm (starting from 2008 only on Turbo X) (345x30)

The second couple describes the rear discs

BA: 15" 278mm (from 2003 to 2007 on 1.8i, 2.0t, 1,9JTD. From 2008 on only mounted on 1.8i) (278x12 - Hub Bore 65.5mm)
BB: 16" 292mm (292x20 - Hub Bore 65.5mm)
BC: 16" 292mm only on XWD (292x20 - Hub Bore 70mm)

The third couple describes front brake caliper

CA: 15"
CB: 16"
CC: 16"+
CD: 17"

The fourth couple describes rear brake caliper

DA: 15"
DB: 16"

On the front of the 9-3 we have a 302mm rotor on a 16" bracket. This should be an Unloaded (no e-brake) version of the Rear Caliper for the 9-3 on the same(?) bracket. This Rear Caliper fits over a 292mm rotor...the exact same rotor as the LNF. Center bore for the 9-3 and Cobalt Rotors match, front and back and 5x110. What I believe the '16+' is supposed to be is the 16" Caliper on the 17" bracket, which may fit under the stock 17s considering the 9-3 2.8 rims were. Maybe the LNF caliper fits that bracket so no need to modify lines(I think the brake lines have the same thread)? So maybe 314mm rears to match Brembo 315mm in the front?
 

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #6 · (Edited)
Im trying to find more info before buying anything. Correct me if I'm wrong but these look like the same exact part other than a different bleeder spot and a slightly different e-brake maybe? I can't find the Caliper Bracket Bolt for the 9-3 2.8 anywhere to check the thread size to see if they really are bolt on.

9-3 2.8L Rear Caliper
Font Machine Auto part Nut Metal
Font Rectangle Screenshot Number Parallel


LNF Rear Caliper
Font Auto part Automotive exterior Metal Machine
Rectangle Font Screenshot Number Parallel
 

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I'm pretty sure it's the size of the caliper that's different as well, even the rears. The SS SC/TC has bigger rotors than the 2.4L versions. A quick search between Wagner rear rotors, gives me this info:
Fits G5 GT
Rotor Outside Diameter (in.):
10.63 in.
Nominal Thickness (in.):
0.551 in.

Fits Cobalt SS (LNF)
Rotor Outside Diameter (in.):
11.03 in.
Nominal Thickness (in.):
0.950 in.
 

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Discussion Starter · #8 ·
The SS SC/TC has bigger rotors than the 2.4L versions
I know, Im comparing a Saab 9-3 caliper to an LNF caliper. The 9-3 2.0T has the same 292mm rear rotor as the LNF. But the 9-3 2.8 had a 302mm and a 314mm rotor that fit the rear with that same caliper, 9909132B. If its the same as the LNF caliper with a few minor differences, I could use the larger Saab rotor with it.
 

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I know, Im comparing a Saab 9-3 caliper to an LNF caliper. The 9-3 2.0T has the same 292mm rear rotor as the LNF. But the 9-3 2.8 had a 302mm and a 314mm rotor that fit the rear with that same caliper, 9909132B. If its the same as the LNF caliper with a few minor differences, I could use the larger Saab rotor with it.
Yeah, that shouldn't be a problem then. The hub size was the other concern, but that's for the front brakes.
 

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #10 · (Edited)
From everything I've looked through so far, it seems like all the Saab 9-3 rotors are the same sizes as the G5/Cobalt rotors, as well as a few of the Saab 9-5 rotors like the 299mm rear. Gotta check more stuff but it seems like if one of the Saab Rotor Fits, the accompanying Caliper should too.
 

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'Gremlin' the 07 G5GT (913L)
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Discussion Starter · #11 · (Edited)
the 9-3 2.8 had a 302mm and a 314mm rotor that fit the rear with that same caliper, 9909132B
I misunderstood the label, it meant whatever rear disc was on the 302/314mm front disc version, would be nice if it was clearer. However the 302Mm should still fit the LNF Caliper with a hub spacer for the rotor or even better...
2010 Saab 9-5 Rear Vented Rotor
Font Line Parallel Circle Screenshot

Should fit with no spacer. However since theyre still the same thickness as the LNF 292 I dont think theyd change the braking characteristics much.
I think I'll try the 314mm w/ the Brembos in the Front and the LNF Caliper with the 299x20mm in the rear. If I still dont like how the rear feels after that, I might switch to the 302x28mm if I cant find something around a 24-26mm thickness (I know the Stock Cobalt 315 Brembo Rotor is ~26mm thick but recommended wear is from 26 to 24mm vs 28 to 25mm for the Saab Rotors, however ~2mm is about the same recommended wear as other rear discs). I will have to do Stainless Steel LNF Brake Lines and since I'll be bleeding the system fully, DOT 5.1 (Not DOT 5)
 
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