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What's the purpose of bigger front calipers?

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What's the purpose of bigger front calipers?
Old May 8th, 2019, 12:43 AM   #1
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What's the purpose of bigger front calipers?

Since the oems are plenty capable of locking up the fronts, what's to be gained by going bigger in the front? I understand the rears are a different story.

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Old May 8th, 2019, 06:30 AM   #2
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Typically you don't go bigger in front unless you go bigger in the rear. One option is to get Tom's 40MM rear brakes to balance out the fronts, better braking performance and less of a chance of locking up the front. I have a used set for $700 shipped.
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Old May 8th, 2019, 07:57 AM   #3
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Dissipation of heat. Not a worry on a street car but a tracker will heat the brakes very quickly. Did I say "very quickly?" I meant "very, very quickly."

Mike (99rt...) makes a good point about Tom's 40mm and levelling out some bias between front and rear that will give a bit more stopping power for the street. When my rears crap out I'll upgrade to Tom's.

There are other ways to change the bias but they are not really practical for street use.
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Old May 9th, 2019, 01:42 AM   #4
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Mike - I'm thinking about Tom's. I'd like to put in something a little bigger, such as the OEM rears on the ABS cars (43mm), which is capable of locking up the rears. Then I'd dial it back just shy of lock with a prop valve. This would mainly be for autox, where there's really no danger if you lock the rears.

Does anyone know if the 01-02 rears would fit on a pre-abs car?
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Old May 9th, 2019, 06:07 PM   #5
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They won't, the knuckle casting is different
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Old May 9th, 2019, 08:37 PM   #6
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I've got several unused sets of Toms 40mm rears. $800 shipped...
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Old May 11th, 2019, 06:06 PM   #7
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Quote:
Originally Posted by jjsxw6 View Post
Since the oems are plenty capable of locking up the fronts, what's to be gained by going bigger in the front?
Stopping more quickly.
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Old May 12th, 2019, 12:18 AM   #8
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Quote:
Originally Posted by White Out View Post
Stopping more quickly.
How so? If the oem's can lock the fronts, then there's sufficient clamping force and the tire is the limiting factor. I don't see how clamping any harder is going to help that situation.
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Old May 12th, 2019, 04:18 AM   #9
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Mashing on the brake pedal to lock the tires is not an indicator of braking power. My 1960 Corvette with drum brakes will lock all 4 up, my LP640 with CCB won't.
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Old May 12th, 2019, 01:02 PM   #10
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Mashing on the brake pedal to lock the tires is not an indicator of braking power. My 1960 Corvette with drum brakes will lock all 4 up, my LP640 with CCB won't.
What's the tire size on the corvette? I'm guessing the lambo has a much larger contact patch, and a stickier compound. And besides, it has ABS, so it's not going to lock anyway.
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Old May 12th, 2019, 03:29 PM   #11
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Somebody is picking up on the purpose of larger brakes and additional variables on how to make them work to the efficiently and properly.

But seriously, Bigger calipers (4 or 6 piston) have a stronger bite, equal application of pressure on the pad/rotor, cool fluid better, prevent fade and are generally lighter than OEM components. Also, they usually are matched with a performance oriented pad and lightweight and larger rotor with a better design for cooling. So as a whole, they can take a continuous beating and still perform.

My '00 has stoptech 4 piston on the front and when I went swapped OEM fronts on the rear, it really transformed the car's ability to quickly slow from high speeds and not have fade. I had SRT at all corners on my '99 ACR and I think this might be a better set up. It's really nice having confidence in braking with a Viper because most of us have been in situations where that wasn't the scenario.

Tires, wheels, fluid and alignment also play a major role in stopping . . . along with driver mod.
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Old May 16th, 2019, 12:53 PM   #12
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being able to "lock up" your brakes isnt the key to good brakes.

larger calipers are typically to cover larger rotors,

most of these items mean a better ability to handle heat from prolonged braking

typically performance braking means easing/slipping the brakes, not full mash lock up.

most of the time a multi piston caliper, 4-6 etc+ have different size pistons so they move at a different rate and the application of the pad is smoother and more gradual & even
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