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Old 08-02-2003, 07:44 PM
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Dual Calipers

ok this might be dump but might as well ask i was reading some stuff about disc breaks when i came across something about a saleen (not mustang) with a new designed a caliper that is longer so it has more surfice area it said it was about twice the size of a avarage caliper then i thought why not use two calipers i mean i know the master cylinder has to be modified or use two but wouldnt that make a big difference in stoping power

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Old 08-02-2003, 08:47 PM
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my guess would be, that in the divisions saleens run in, its not entirely uncommon to have to change the brakes in the course of a race. dual calipers would definately add time to that.....
and i'm also thinkin', the more moving parts something has, the more likely it is to screw up........fwiw....
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Old 08-07-2003, 02:35 PM
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i looked up how calipers worked making one doesnt seam complicated i dont know
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Old 08-07-2003, 05:51 PM
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I would have to guess that many years ago our engineers had a similar thought. Then they had a better one and decided they could accomplish the same thing by simply adding multiple pistons in a single caliper. This method is cost effective since you still only have one caliper body, one hydraulic hose, one set of slides per knuckle, one set of pads, and you don't need some extravagent steering knuckle costing more money and weighing more. This is the reason many sports cars have up to four pistons per caliper, great stopping power in a relatively simple set-up.


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Old 08-07-2003, 05:54 PM
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like which ones?? i didnt know any cars came with 4 pistons (but then again i dont know alot) the only cars i know that have 4 pistons is the ones that added baer calipers
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Old 08-07-2003, 06:03 PM
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Well I couldn't say for sure without looking through some manuals but I do know I just did a brake job on a jap truck (Toyota 4x4 I think) a while back that had 4piston calipers. Generally 4piston calipers have 2 pistons on each side of the rotor applying pressure equally on the front and rear brake pad. It's a set-up that's been around for years, just not widely used on most passenger cars where it isn't really needed.


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Old 08-07-2003, 06:05 PM
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that is really interesting man i'm going to look more into this stuff
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Old 08-07-2003, 06:13 PM
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DMN here are a couple of pics of a 4piston caliper from a Toyota service manual. Sorry the pics are kinda small.
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Old 08-07-2003, 06:14 PM
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another
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Old 08-07-2003, 06:15 PM
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yet another pic
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Old 08-11-2003, 11:05 AM
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Corvettes use four piston calipers, so do Jaguars. Some other sports cars (I bet those Toyotas are from a Supra) do also. You could use two calipers without changing master cylinders -- the same amount of pressure is delivered to both, just takes a little more leg. The main problem with that approach would be heat. The rotor would have less area and time to dissipate heat, so you'd run into a problem real quick!

The first Bendix disc brakes were four piston. These were optional on most 66-70 cars. The single piston came around in 1971. The Bendix four piston are prone to leaks, mainly because there is an internal passage from one half to the other sealed with a gasket. Jaguar calipers are similar but use an external line to connect one side to the other.

I have Jag two piston rear calipers (with the Jag rear axle) and AMC single pisons on front (63 Rambler wagon), but plan on installing four piston Jag calipers on front when I locate a pair cheap. The local pick-n-pull got rid of the two Jags they had before I could snag a set, waiting for them ot get another...
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Old 08-14-2003, 09:06 AM
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My 66 mustang gt has 4 piston calipers. Very expensive to replace. I have seen many european cars modified using two calipers per rotor. Mostly on all wheel drive european sedans(VW, BMW,Audi) But as to what benefit there is I dont know.
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Old 08-14-2003, 01:17 PM
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OK... Now you people had me thinking. That takes alot out of me. I went out and checked the 84 Vette rear calipers I have. They are single piston calipers. I have a Vette Chilton's book, that only goes to 83, and it shows 4 piston calipers. Do I have odd ball calipers, or does someone know if they changed in 84? I can see where 4 pistons would apply the pressure more evenly on the pads, and both sides of the rotors, and reduce a problem with slides hanging up. I would guess that would be an advantage, but I am in no way an expert on brake calipers.
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Old 08-14-2003, 01:31 PM
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The biggest problem I understand from friends in the repair business is that the early american four piston calipers tended to rust and then leak, they can be rebuilt which then they use stainless sleeves in them. I think that Bear or Wilwood might even have some now with six pistons for race cars.
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Old 08-14-2003, 02:17 PM
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you're right on the money with that one eblack. I've seen the 6 piston calipers, they look pretty serious.
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