Will 13" rotors work with stock GT calipers?

stock calipers wont work

nope, you need the cobra calipers. they have a diff bracket, and actually they bolt to that bracket differently, they dont use bolts.

You can buy cobra/mach1/bullitt calipers for a good price from buyfordracing.com. They come with pads, so all you need besides the calipers are the rotors for 94-04 model installation.

Quick and easy to install, only 3 bolts to mess with after getting the wheel off.

TrueBlue03 said:

thanks!

anyone got any info on bleeding the brakes?

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all ya have to do is open the bleeders that are on the calipers and have someone pump the brakes and then tighten the nuts down when the fluid starts to come out so there is no air in the brake system. Really easy to do.

and on bullitt archive their are many maintenance tips heres the link to bleed the brakes. I suggest bookmarking the home page for future reference
http://www.bullittarchive.com/1003.htm

you dont need to switch brake hoses necessarily, but its definately suggested to switch to stainless braided lines.

TrueBlue03 said:

awesome thanks a lot for that walkthrough. :SNSign:

one more question though...Will I need a new set of brake hoses to go with the bullitt calipers?

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yeah the stock ones will work but the stainless ones a a pretty good upgrade.

Actually from what I understand, the 11.65" rear rotors will fit on the stock rear gt calipers. All you have to do is use worn-down pads to fit over the larger rotors or buy the pads made for it.

I think there is a lot of work involved in installing the rear upgrade calipers, including disassembling the rear end to access the axle completely.

Mustang5L5 said:

The bullitt calipers are a direct bolt on onto the GT rear setup. Same caliper really, just painted red with a different U-shaped bracket than the GT.

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'93 Cobra R: 13x1.1" vented rotors, PBR dual piston 38mm unit from Corvette (interchangeable with Cobra and Bullitt calipers). 10.5" rear vented disc.

'94-95 V6 & GT: 10.8x1.0" front rotors, 66mm single piston calipers. Rear single piston 38mm Varga caliper, 10" solid rotor

'94-98 Cobra, '95 Cobra R: 13.0x1.1" KVH rotors, 38x38mm dual piston PBR calipers. Rear single piston 38mm Varga Caliper, 11.65" vented rotor

'99+ V6 & GT: 10.8x1.0" front rotors, 44.5x44.5mm dual piston PBR calipers. Rear single piston Varga caliper, 10" solid rotor

'99+ Cobra: 13.0x1.1" Brembo rotors, spec'd 40x40 mm dual piston PBR calipers. Rear single piston 38mm Varga Caliper, 11.65" vented rotor

'01 Bullitt Mustang: Same brakes as 94-98 Cobras (unique red PBR calipers with running horse up front, same varga caliper in rear painted red.) Rear single piston 38mm Varga Caliper, 11.65" vented rotor

'00 Cobra R: 13.0x1.1" Brembo rotors, Brembo 4 piston calipers. 36x40mm pistons. Rear disc the same as the stock '99+ Cobras

Notes on Parts:

The '94-95 spindles are different from the modular '96+ units. The '94-95 units have a curved steering arm and keep the stock track width on a fox3 car. These are the spindles that most people use on the fox3 cars to keep the stock track width. The '96+ units have a straight steering arm and will increase the track ~8mm per side. The '96+ units will give you even more ackerman steering and allows to run the '00R brake cooling ducts or other brake cooling systems. You may need to run a bumpsteer kit to use the SN95 spindles, especially if your car is lowered!

For the year, the spindles, hubs, rear axles, ebrake cables and rear calipers on the SN95s (94-98 for the rear calipers and axles on the Cobras) are the same on the V6, GT and Cobra. So if you are looking for these parts, you can get the parts from a V6 to save cost. Most wreckers charge more for the GT and Cobra parts, so you can beat them at their own game.

Since the rear calipers are the same between the 94-98 V6, GT and Cobra, how do they work with the larger Cobra brakes? First the cobra has a taller axle to caliper bracket to accommodate the 11.65" rotor. Second to accommodate the thicker rotor, the Cobras use brake pads that are thinner than the V6/GTs. There seems to be 3 different rear brackets between the 94-present Mustangs. Any will work, but if you use the GT/V6 bracket with the thicker cobra rotor, you may need to clearance the inside of the caliper bracket a bit.

bullitts use twin 38mm pistons, and the gt uses twin 44.5mm pistons. slightly different