I was considering picking up a pair of V2 rear calipers and swapping for the stock units - Anybody know if it's a direct swap??
This...,,if you want V brakes do all of it....rotors and calipers, front and rear....or at minimum if the rotors are compatible calipers only.....otherwise your monkeying with a Nurburgring tuned brake setup, no need to throw that out of whack, plus you'd also likely be throwing stabilitrak and ABS out of whack too....going from a single piston sliding caliper to a 4 piston unit is a huge change and balance will be changed for some weirdness, partly due to clamping power, and partly due change in fluid use..... the amount of fluid used to move 4 Pistons vs 1 would at least triple and change pedal travel and add mushinessAlso there is talk about how it's not too smart to change the brake bias on the car.
if by comprehend you mean make up stuff they didn't say, you'd be right...but like i said they partly agree with you by saying one side, but they don't say multiply by two, and neither does your quote from them say it....you were reaching on that oneIn the first four examples, the fact it's not mentioned is certainly not proof that it's not valid. But from the 5th link (where you say they "partly" agree with me), they do mention it, you just have to be able to read and comprehend. Here's the quote from the Wilwood paper:
"A calipers piston area is calculated by finding the total piston area from one side of the caliper (this is true for a single piston caliper also)." (underscore emphasis mine)
What this says is that if you want to compare floating and fixed caliper piston areas on an even basis, you only look at one half of the caliper - ignoring the fact the floating caliper only has piston(s) in one side.
I did a quick search on the subject and came up with this site which deals with actual calculations. It very clearly spells out the need to double the piston area on floating calipers. In fact it's mentioned twice...
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And another calculator complete with a note (under "Terms and Values Explained") that states exactly what I've been saying from the get-go. Here's the quote:
"Note: multi piston calipers express their values using one HALF of the caliper body. This accounts for the floating aspect of the single piston caliper. A six pot caliper would be 1.625/1.125/1.125" for example. True clamping force would be double that but also double the single piston of a floating caliper taking into account the 'pull' of the outer pad to the rotor surface. Using total area (all six for example) would require you double that of the floating caliper also- thus the net result is the same whichever way you do it."
Actually, in the end we have you refusing to believe something that is pretty much 6th grade physics. What's your opinion of the other two quotes I pointed out... the ones associated with caliper piston area calculators? They made that stuff up too?if by comprehend you mean make up stuff they didn't say, you'd be right...but like i said they partly agree with you by saying one side, but they don't say multiply by two, and neither does your quote from them say it....you were reaching on that one
in the end we have differing information hence the :hmm:
Without knowing the piston diameters involved you can't make that sort of statement.This...,,if you want V brakes do all of it....rotors and calipers, front and rear....or at minimum if the rotors are compatible calipers only.....otherwise your monkeying with a Nurburgring tuned brake setup, no need to throw that out of whack, plus you'd also likely be throwing stabilitrak and ABS out of whack too....going from a single piston sliding caliper to a 4 piston unit is a huge change and balance will be changed for some weirdness, partly due to clamping power, and partly due change in fluid use..... the amount of fluid used to move 4 Pistons vs 1 would at least triple and change pedal travel and add mushiness.
Did you bother to check to see if Brembo even offers such a thing?in that case i wouldn't even bother with trying to figure out Cadillac OEM Brembos and call a brembo distributor and get some 2 pot calipers that fit the V-Sport
View attachment 410049
No, it isn't. The VSport front caliper is significantly larger. Compare a FMSI D1001 pad vs a D592 pad and you'll see.remember, the V-Sport front caliper is essentially the V rear caliper
Again, the number of pistons has nothing to do with this, it's the area of the pistons that matters. My V1 came from the factory with 4-piston Brembos front and rear and that wasn't weird at all.so doing 4 pot in the front and 4 pot in the rear could get weird for the car but 2 pot rear and 4 pot front is a common pairing.
All of which is the same thing.it's actually more than piston area....it's piston area, volume of fluid required for a given travel of pistons in calipers (slave), # of pistons,
How are any of these factors being affected by changing the rear calipers?volume of fluid displaced by plunger/piston (master), leverage applied to plunger (travel & length of lever which is typically a brake pedal or brake lever) , and force applied to lever.....its because of these factors i said the brakes will get weird
Denrael is correct, you are not. If you understand how a sliding caliper works then it's obvious why you have to double the piston area; the force generated by the piston(s) acts on both sides of the rotor. So when you're comparing fixed vs sliding calipers, you either double the sliding caliper's piston area, or you only use 1 side of the fixed caliper.if by comprehend you mean make up stuff they didn't say, you'd be right...but like i said they partly agree with you by saying one side, but they don't say multiply by two, and neither does your quote from them say it....you were reaching on that one
in the end we have differing information hence the :hmm:
It said they were too big because they were too big. The "Manage Attachments" box tells you exactly what the size limits are - 1024x768, 390.6kb. Your first two images are 1066x800. There are a bazillion programs that will resize JPEGs - I would think a Mac would do it automatically if you just say, "Steve Jobs' ghost, please resize my images."BTW - HOW do you get pictures uploaded here. Every time I try it says they are too big?!
I replaced the links with the actual images embedded into the post. If you go to your images on postimage.org and click on the "Share" button, you're provided with a variety of ways to share the images. I copied the "Direct Link" and put tags on either side. That embeds the image directly into your post, and that way people don't have to click a link to open up another site to see your pictures.Here is a link to the pictures of my car with the calipers. Let me know what you think and if you have any questions!
The unanswered question in my mind was brought up by AAIIIC in an earlier post and is important enough to bear repeating. Did you end up with pad overhang on the rear brakes, using the stock rotor with a caliper designed for larger diameter rotors? If so, how much?The rotors are undersized yes. But its the kit that was available. I chose not to buy larger rotors for simplicity and cost.
Make sense?