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Racing stuff-rear mounting front brake calipers

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Old 01-09-2018, 05:01 PM   #1
Pop Chevy
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Default Racing stuff-rear mounting front brake calipers

There has been some discussion here about how to rear mount your front brake calipers. I'm getting back to working on my 70 Vintage race car and am starting on this job as I feel the need to get more air into the front brakes. If anyone is interested I will take some pics of my progress. Doesn't look too complicated, yet not a simple bracket swap either. I need to get this car on the track this spring !
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Old 01-09-2018, 06:15 PM   #2
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Definitely interested, please keep us posted!
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Old 01-09-2018, 06:33 PM   #3
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By "some discussion" that may include me, as I did that a while back. No regrets although there were some issues with the proportioning valve. Here's the thread:

https://www.corvetteforum.com/forums...-part-3-a.html
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Old 01-09-2018, 06:52 PM   #4
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I would like to see any thing you would like to share about mounting the calipers in the rear.
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Old 01-09-2018, 07:59 PM   #5
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Er? Are we talking about relocating the front calipers at the back of the front spindles to allow for more cooling ( Like a racing application ) ? OR relocating the front calipers at the rear of the car, replacing the "smaller" rear calipers?

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Old 01-09-2018, 08:15 PM   #6
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O-k here ya go. This is what I'm building. I started with a really ratty 1970 LS-5 car, it even had an engine fire at one point with ensuing fiberglass damage. Fender, hood, firewall damage and looks like it had been stored outside for a looong time. So I felt no guilt about turning it into a racecar. Car is close to being done, rolls and steers and the engine (454) runs. Frame all blasted and reinforced, full cage, fuel cell, suspension mostly done. Time to make it stop. I know it's going to be fast and I know the brakes are going to take a beating. Lots of cooling air will help them live , so that's the next step.
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Old 01-09-2018, 08:21 PM   #7
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Sorry, I guess I should clarify. I am moving the front calipers from the front of the rotor to the back of the rotor. This gives much more room to put cooling ducts in to force air into the center of the rotor. Check out the pics I have and you will see what I mean. Yes, It's a racecar.

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Old 01-09-2018, 08:30 PM   #8
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You can see the stock bracket, I am going to use a left side bracket on the right to simplify things. It actually was fairly easy this way. If you have a saw and a welder you can do this yourself, that's why I'm posting these pics. Time to give back.
It took me 3 cuts and some grinding to get the bracket in place. I like to make small cuts to sneak up on the fit. You can see how much I had to remove.
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Old 01-09-2018, 08:35 PM   #9
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Test fit. Looking good.
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Old 01-09-2018, 08:51 PM   #10
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Quote:
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Test fit. Looking good.
since when are Wilwood calipers legal in group 6 ?
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Old 01-09-2018, 09:19 PM   #11
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I hadn't looked at this before, but actually looks pretty simple so might be worth my while... Thanks heaps for sharing!
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Old 01-09-2018, 09:49 PM   #12
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which brake caliper model is that wildwood and what is the diameter of the hat type rotor? Does it have very much clearance in a 15 inch wheel.

Like RedVette ask, the rule book is your friend. I did not have limitations racing in Vintage Productions SCCA or VARA. It seems like the only thing they cared about was the pound per ci and safety equipment
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Old 01-09-2018, 10:51 PM   #13
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I do enjoy seeing custom work/fabrication.
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Old 01-09-2018, 11:10 PM   #14
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D8-4 It's a direct replacement caliper for the iron ones which I also have. This will mostly be a track day car. I do believe VRG and the PVGP assoc. allows them but I have the option to convert it over easily. The rotors are standard 11.75 dia. and 1.25 thick, Wilwood rotor and hat, they are accepted by all sanctions (I think). Calipers are identical in physical size and piston size , I don't anticipate any clearance issues but hope to finish the caliper mounts tomorrow and will find out then.

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Old 01-09-2018, 11:16 PM   #15
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This worked out well, I was able to use the cutoff piece turned over to make the lower mount. Saved time fabricating and drilling. All I had to do was add a gusset out of 1/4 in steel and weld it up.
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Old 01-10-2018, 05:45 AM   #16
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Just love it.
Thanks a lot for the pictures.
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Old 01-10-2018, 06:48 AM   #17
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I have a question - and straight 'off the top of my head". My late father in-law ran an early RR Shadow. I was always impressed with the braking on these cars - especially the dual calipers on the front end.
So my question is ~ is it feasible to do this this conversion AND keep stock caliper location? - theoretically a simple method of doubling-up on braking surface - OK, so the cooling issues still remain (and probably worse) under race conditions - yeah, unsprung weight will increase, I'm guessing not 'legal' for racing.........but for street use?
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Old 01-10-2018, 06:48 AM   #18
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Quote:
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Just love it.
Thanks a lot for the pictures.

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Old 01-10-2018, 10:00 AM   #19
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Quote:
Originally Posted by roscobbc View Post
I have a question - and straight 'off the top of my head". My late father in-law ran an early RR Shadow. I was always impressed with the braking on these cars - especially the dual calipers on the front end.
So my question is ~ is it feasible to do this this conversion AND keep stock caliper location? - theoretically a simple method of doubling-up on braking surface - OK, so the cooling issues still remain (and probably worse) under race conditions - yeah, unsprung weight will increase, I'm guessing not 'legal' for racing.........but for street use?
Back 30 + years ago you would see c4 vettes at the tracks with dual front calipers. it was before the days of a large selection of aftermarket choices. It was always a bad idea because the rotors couldn't take the heat. I saw them in the pits replacing cracked rotors. Then the next event they were gone
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Old 01-10-2018, 10:29 AM   #20
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I tried to find someone technical articles on caliper position and it's effects transmitted to the vehicle body

Front mounting under braking pulls down. Rear mounting lifts up. The can actually be seen if the car is suspended with the tire spinning and stomp on the brake

I was the mechanic on a winning IMSA car for years and the calipers were on top and I was told that it counter acted braking inertia. It used wheels with fan venting to draw air across the brakes and out . On course with heavy braking in hot weather the wheels would get so hot that it would melt the tire beads on other older racing cars I've seen water spray squirters into the air ducks and it actually worked quite well
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