anyone using these calipers?? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 31 (permalink) Old Mar 4th, 17, 12:01 PM Thread Starter
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Question anyone using these calipers??

My brother, (a Chevelle guy) has a friend who replaced the 307 in his '71 Malibu with a 454. Among other things, he replaced the single piston GM front disc brakes with these Wilwood calipers. He wanted keep his stock Rallye wheels and thus rotors, He claims these new Wilwoods have dramatically improved his braking over the GM single piston OEM's. It sound like an interesting upgrade for my '68 GTO which was converted to the single piston calipers discs years ago.

Has anyone used these calipers on their A-body and if so, what did you find/think about them? Thanks!

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post #2 of 31 (permalink) Old Mar 4th, 17, 12:28 PM
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Re: anyone using these calipers??

You don't have the correct link.
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post #3 of 31 (permalink) Old Mar 4th, 17, 3:33 PM
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Re: anyone using these calipers??

This?

https://www.summitracing.com/int/par...6-rd/overview/

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post #4 of 31 (permalink) Old Mar 4th, 17, 3:54 PM
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Re: anyone using these calipers??

You need to do the math & find the square inches of each caliper. More = more braking at the same pedal pressure.
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post #5 of 31 (permalink) Old Mar 5th, 17, 12:12 AM
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Re: anyone using these calipers??

I have them on my 71....were ok with vacuum, now with newly added hyrdoboost they are king!
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post #6 of 31 (permalink) Old Mar 5th, 17, 7:22 AM
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Re: anyone using these calipers??

Just put a set on a 66 on Saturday great looking. Will see how it stops on sunday need to finish the master cyld.

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post #7 of 31 (permalink) Old Mar 5th, 17, 11:41 AM Thread Starter
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Re: anyone using these calipers??

Quote:
Originally Posted by LevonH View Post
YES! Typos can kill a person

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post #8 of 31 (permalink) Old Mar 5th, 17, 11:43 AM Thread Starter
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Re: anyone using these calipers??

Quote:
Originally Posted by 1967 chevelle malibu View Post
You need to do the math & find the square inches of each caliper. More = more braking at the same pedal pressure.
I assume you mean the sq in of each caliper piston surface? Or something else? Thanks!

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post #9 of 31 (permalink) Old Mar 6th, 17, 4:37 AM
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Re: anyone using these calipers??

those calipers are listed as having 2 x 2" pistons. 2 x 2 x .7854 = 3.1416 x 2 pistons = 6.28 sq in of piston.

That's actually pretty close to the right size which is around 7 sq in.

incidentally, .7854 is equal to Pi/4, which is why the math works out like that.

Too bad they didn't produce those calipers with 2.125 piston, would have been very close to exact.

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post #10 of 31 (permalink) Old Mar 6th, 17, 10:18 AM
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Re: anyone using these calipers??

Yes it is the square inches of all pistons on the same side. Adding pistons to the oposite side does not add braking force.
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post #11 of 31 (permalink) Old Mar 6th, 17, 10:58 AM Thread Starter
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Re: anyone using these calipers??

Quote:
Originally Posted by Tom Mobley View Post
those calipers are listed as having 2 x 2" pistons. 2 x 2 x .7854 = 3.1416 x 2 pistons = 6.28 sq in of piston.

That's actually pretty close to the right size which is around 7 sq in.

incidentally, .7854 is equal to Pi/4, which is why the math works out like that.

Too bad they didn't produce those calipers with 2.125 piston, would have been very close to exact.
Quote:
Originally Posted by 1967 chevelle malibu View Post
Yes it is the square inches of all pistons on the same side. Adding pistons to the oposite side does not add braking force.
Thanks! That makes for objective comparisons. Out of curiosity, does anyone know the piston area of the GM single piston on thhe "single piston" caliper? Appreciate it!

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post #12 of 31 (permalink) Old Mar 6th, 17, 11:06 AM
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Re: anyone using these calipers??

Installed them on my Nova and noticed a big difference in stopping distance. The piston surface area is a little smaller but spread more evenly across the pad. Don't know if that was the difference but the car stopped better than with the stock iron caliper.

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post #13 of 31 (permalink) Old Mar 6th, 17, 11:16 AM
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Re: anyone using these calipers??

Quote:
Originally Posted by BigBlockLover496 View Post
Thanks! That makes for objective comparisons. Out of curiosity, does anyone know the piston area of the GM single piston on the "single piston" caliper? Appreciate it!
2.934" is the OD of the stock piston. If my calculations are correct the area is 6.75".

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post #14 of 31 (permalink) Old Mar 6th, 17, 11:57 AM
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Re: anyone using these calipers??

Quote:
Originally Posted by Tom Mobley View Post
those calipers are listed as having 2 x 2" pistons. 2 x 2 x .7854 = 3.1416 x 2 pistons = 6.28 sq in of piston.

That's actually pretty close to the right size which is around 7 sq in.

incidentally, .7854 is equal to Pi/4, which is why the math works out like that.

Too bad they didn't produce those calipers with 2.125 piston, would have been very close to exact.
Tom, can/will you elaborate on the sizing? I've always been curious about the math and sizing. Your wisdom is always appreciated.

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post #15 of 31 (permalink) Old Mar 6th, 17, 1:17 PM
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Re: anyone using these calipers??

Big difference between the 2" piston version and the ones with nearly 3" size which are much better.

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My build thread> http://www.chevelles.com/forums/56-pro-touring/613546-65-chevelle-2dr-post-car-build-thread-aka-chevelle-hell.html
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