Gen2 front calipers used on the rear wheels?

[kcobean]

I was looking through some other posts, and something occured to me. Why doesn't anyone use the Gen2 front calpiers on the rear as a brake upgrade? I don't think I've ever seen this done or even mentioned, and there must be a reason I'm just not sure what it is. Dave/Tom, any pearls of wisdom you can share?

 

[2002_Viper_GTS_ACR]

I think the problem becomes a couple of things:

1. Those rears would use up a LOT more fluid then the stock brake master could push to acuate them vs the old ones. Stop tech fixes this by making the pistons smaller i believe in the full 4-way system. (making both the fronts and the rears smaller pistons to make up for the amount of fluid that is moved by the brake master. So that means if you use their 2 front piston kit, you cant LATER add the 2 rears, as its an all or nothing, 2 fronts with bigger pistons, and you run your stock rears, or 4 all new calipers all the way around so they can size the amount of fluid each of hte pistons takes.

2. Thats a LOT of brake force on the rears, so you can about guarantee lock up with that much rear force, so break proportioning valve would have to be used and adjusted propertly for such a massive rear break system on a car that wasnt designed for it.

My 2 cents with 2 reasons.

Jon

 

[Neil - UK]

...errr its been done plenty of times, a few times even over here with Daves brake kit

 

[plumcrazy]

id like to see someone try it. id think it would work.

daves kit uses them with the SRT ones in front right ? why wouldnt they work with all 4 the same ?

 

[2002_Viper_GTS_ACR]

id like to see someone try it. id think it would work.

daves kit uses them with the SRT ones in front right ? why wouldnt they work with all 4 the same ?

DIFFERENT BRAKE MASTER !!

 

[REDSLED]

I have been using the stock fronts on the back of my race car for the past 3 years and have had zero issues. John is right in that the Stop Tech system uses smaller pistons to offset the brake bias issues that will occur when using similar calipers on the back. The trick is to install a brake bias adjuster. You can run most any caliper on the back, if you have the bias set properly. I currently run the stock SRT-10 4 piston Brembo caliper on the front and the stock Gen 2 front Brembo calipers on the rears with the brake bias adjuster. There have been zero issues and the car stops every bit as good or better than other systems I've had on the car. I've retained the stock master cylinder as well. I use this system for the track, not the street but I assume the there would be no difference.

 

[IEATVETS]

Just had my brakes done on my 00 GTS. SRT calipers on the front with new rotors and the stock front calipers were moved to the rear, new rotors back there as well. Also installed stainless brake lines. I don't know squat about brakes but a new SRT master cylinder had to be installed and a proportioning valve as well.

 

[plumcrazy]

id like to see someone try it. id think it would work.

daves kit uses them with the SRT ones in front right ? why wouldnt they work with all 4 the same ?

DIFFERENT BRAKE MASTER !!

oh im sure, but there has to be a way with a few different settings to make it work. I wanna hear from tom or dave to see what they say.

 

[kcobean]

The common theme I see is that everyone is using the stock fronts on the rear *IN COMBINATION WITH* SRT brakes up front. Dave's upgrade looks fantastic and I know it stops better than stock. I was just wondering, what if I can get a set of stock fronts for cheap, what would have to be done to have Gen2 front calipers on all 4 corners, and would this be an effective setup?

Is anybody running stock fronts all around? RedSled, did you at some point run this way prior to installing the SRT setup up front?

 

[Dave's Big Brakes]

You can't use gen2's on all 4 corners You'd have too much rear brake even with a adjustable valve just not good balance.

SRT-10's on the front with Gen2's on the rear for Non ABS cars. You can upgrade the m/c to the abs one, bigger bore & stroke, but not needed. Adjustable valve for "track or HEAVY Street" use works really well.

Like Redsled said, he's used it on the track with great results, and it also works great on the street.

Hope this helps

Dave

 

[kcobean]

Thanks Dave. You stipulated above "SRT-10's on the front with Gen2's on the rear for Non ABS cars."

What are the options for ABS cars?

 

[Dave's Big Brakes]

Just had my brakes done on my 00 GTS. SRT calipers on the front with new rotors and the stock front calipers were moved to the rear, new rotors back there as well. Also installed stainless brake lines. I don't know squat about brakes but a new SRT master cylinder had to be installed and a proportioning valve as well.

Make sure the m/c isn't hitting the hood (the srt has a bigger res & touches the hood) I found the Gen2 & Gen3's have the same bore & stroke(shop manual) just the reservior is bigger. I use a Gen2 ABS reservior.

Dave

 

[Dave's Big Brakes]

Thanks Dave. You stipulated above "SRT-10's on the front with Gen2's on the rear for Non ABS cars."

What are the options for ABS cars?

ABS Vipers you can use SRT-10's on all 4 corners IF, you have aftermarket wheels(NOT OEM 18") ACR & SRT-10 wheels are ok, and clear calipers. OEM 18" have ZERO clearance.

Call for more info @ 858-382-4713 cell

Dave

 

[VIPER BAZ UK]

SRT-10 fronts and RT/10 fronts on the rear for me....
And they are great.....

 

[Tom F&L GoR]

For the record, the SRT fronts are 44/40mm.
The Gen 1/Gen 2/ABS/non-ABS fronts are 42/38mm.
Stoptech front only calipers are 40/36 to go with OEM rear calipers.
Stoptech four wheel kit is 44/42 front, 28/28 rear. (Old notes, anyone verify?)

I don't think it was explicitly asked, but I assume that any of Dave's kits need adjustable proportioning valves.

As Dave mentioned, an adjustable valve hides many sins, but equal fronts and backs might be more than the valve can handle. The valve controls pressure, but the actual clamping force is (pressure X piston area). With the piston area greatly increased, the pressure can't easily be decreased enough, and if it could, it would be difficult to control. On the car, you want about 67% to 71% of the brake retarding torque up front.

The master cylinder issue may not be as apparent while driving and braking because the distance a piston moves to squeeze the pad onto the rotor is pretty small. But it will be when the reservoir runs dry because the pads wore and now you have 8 pistons extended out of their bores in the back of the car instead of only two.

Pssst. The ugly rear caliper weighs about the same as the pretty front ones. So when you put the fronts on the back, and have to add a parking brake, the total is greater.

Good question!!

 

[Dave's Big Brakes]

Track events you should check ALL FLUIDS 2 times a day min If you let the m/c get low on fluid you shouldn't be allowed on the track

That's like not checking oil levels and wait for the engine to freeze up gee! I need oil

just my .02

 

[Andrew/USPWR]

Front calipers and rotors moved to the back on my 2000 GTS, Viperspeed did the work and added a proportioning valve. Brakes never failed once at the track. I did change the master cylinder out for a Gen III a few years later and a spacer was needed in back to keep wheels from hitting the calipers
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