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Old 08-10-2019, 05:54 PM   #1
poulrais
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Default Cadillac ATS brakes on a 740

1990 740... Been wanting to install big brakes for awhile and this has become imperative with the forged B6284t swap I'm working on. Since there is next to nothing offered for the 740/940 model RogerDee made me these adaptors after I bugged him for like a year!

Now I just need him to make me some 1/2 inch thick hub-centric plate that will go behind the disks to move them forward and clear the adapters and line up to the center of the calipers.

I made myself some 9/16th spacers with some tubing to try these on today and take some pics. I'll probably be using 330mm S60r rotors like the ones in the pictures. I'll also check with Wilwood for for a hat/disk combo if I'm not satisfied with the S60r rotors.

I will also probably have to upgrade my brake's master cylinder to have sufficient brake pedal fell and travel.







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Old 08-10-2019, 07:37 PM   #2
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What about the fit of a rotor from something like a Ford Taurus? Must be something out there with 5 on 108 mm.
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Old 08-10-2019, 08:09 PM   #3
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What about the fit of a rotor from something like a Ford Taurus? Must be something out there with 5 on 108 mm.
Pretty sure a Taurus is 5 X 114.3?
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Old 08-10-2019, 08:10 PM   #4
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Looks like you're right... Taurus has the 5X108 pattern.

https://www.wheel-size.com/pcd/5x108.0/
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Old 08-10-2019, 08:46 PM   #5
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Also 90's Thunderbird and Cougar.
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Old 08-12-2019, 01:15 PM   #6
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Originally Posted by lummert View Post
What about the fit of a rotor from something like a Ford Taurus? Must be something out there with 5 on 108 mm.
I have a pair of wilwoods from an SHO, and the wilwood calipers. They are the skinny ones. 22-ish mm. I can measure them.
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Old 08-12-2019, 01:23 PM   #7
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Soooo why are spacers needed for the disc? Why not just space the caliper correctly?
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Old 08-12-2019, 04:12 PM   #8
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Soooo why are spacers needed for the disc? Why not just space the caliper correctly?
I don't know... RogerDee did the measuring/drawing and milled the spacers. I'll ask him but he must've had a good reason.

If you look at the picture you can see that the adapter is almost touching the strut tube and I don't think that he could place the caliper more inward than that.
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Old 08-14-2019, 02:18 AM   #9
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What are you doing with brake lines? Does the caddy caliper have 2 supply ports?
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Old 08-14-2019, 08:48 AM   #10
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What are you doing with brake lines? Does the caddy caliper have 2 supply ports?
Only one line feeds the Caddy caliper. I'm going to delete the dual line and run single steel braided lines.
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Old 08-15-2019, 02:24 AM   #11
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Dual line? I see so not a turbo car and no ABS. I got a 91 740 like that with the dual lines. Just cap those other lines at the junction box. Not my SE, it has ABS single line, just one of my extras not listed. Can't list them all...
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Old 08-15-2019, 03:31 PM   #12
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Dual line? I see so not a turbo car and no ABS. I got a 91 740 like that with the dual lines. Just cap those other lines at the junction box. Not my SE, it has ABS single line, just one of my extras not listed. Can't list them all...
Yep... 1990 740 NA. California car, no ABS which is fine with me cause I hate these old ABS systems.
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Old 08-15-2019, 07:47 PM   #13
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I saw corvette brakes on a 940 lemons car but dont know who made the brackets
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Old 08-15-2019, 08:05 PM   #14
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Old 08-15-2019, 09:54 PM   #15
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You know you could have mounted Taurus front calipers with 66 mm piston from a Taurus with four wheel disk brakes using Volvo 940 280 mm (11 inch) rotors using the brake pads for the Volvo Rotor. The Taurus caliper fits the Volvo 940 mounting bracket. The biggest headache was figuring out the brake hoses. More than enough brakes to lock the front brakes in a panic stop.
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Old 08-16-2019, 09:54 AM   #16
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Quote:
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You know you could have mounted Taurus front calipers with 66 mm piston from a Taurus with four wheel disk brakes using Volvo 940 280 mm (11 inch) rotors using the brake pads for the Volvo Rotor. The Taurus caliper fits the Volvo 940 mounting bracket. The biggest headache was figuring out the brake hoses. More than enough brakes to lock the front brakes in a panic stop.
This 740 will eventually become a 800 hp track car Lummert so my goal is not to be able to perform a panic stop but to have strong and durable braking performances on the road course/autocross tracks.
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Old 08-16-2019, 11:25 AM   #17
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Stock brakes will lock them up too.

What's the point if you don't go to larger rotors?
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