1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Caliper Bore Sizes for GSL-SE

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Old 05-09-06, 02:14 PM
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Rotary Freak

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Caliper Bore Sizes for GSL-SE

I'm working on a big brake kit for my car, and I need the bore sizes to run calculations. My manual only seems to have the info for the non-SE version.
Old 05-09-06, 09:22 PM
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Rico the rotary freak

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get the ReSpeed big brake kit and TT2 calipers and rotors, great upgrade, If you want to keep the SE 4 lug pattern get 2nd gen front hubs and re drilled the TT2 rotors to 4 lug
Attached Thumbnails Caliper Bore Sizes for GSL-SE-test-027.jpg   Caliper Bore Sizes for GSL-SE-test-036.jpg  
Old 05-09-06, 10:24 PM
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Thanks -- I think I already know about all the big brake kits available. Here's my list of wants:
1. Large front rotors for fade resistance (11.75" X 1.25" or larger -- we'll see what fits in my wheels)
2. Proper front/rear bias for better stopping distances
3. Differential caliper bores to avoid pad taper
4. Hat-style setup so I can easily and cheaply replace my rotors
5. A readily available pad design
6. Keep my rear setup unchanged

When I go to the larger size front rotors, I could widen the FC calipers you're using, but I think the 35.92mm piston bore will give me too much front torque with the larger diameter rotor. This isn't unsafe -- but it isn't optimal for short braking distances. By my calculations, the other kits I've seen are even worse -- all but eliminating the rear brakes from the equation by offering large front caliper bores.

All this is based on the assumption that the OEM setup is correctly biased.

I need the rear caliper bore diameter to verify.
Old 05-09-06, 10:55 PM
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No, it is not stock!

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Make life easy for yourself, don't spend all summer reinventing the wheel. Just do what I did - install the 2nd gen front hubs and brakes, rear calipers and discs. The whole system works very well with good front/rear brake balance using the stock master cylinder in my 84 GSL. These are definitely the best brakes I have ever had on a car.

www.cardomain.com/ride/646433
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