93 Cobra Booster for 00R Brakes? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 07-18-2019, 08:20 AM Thread Starter
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93 Cobra Booster for 00R Brakes?

Found a 1993 Cobra Booster and Master Cylinder yesterday. I cant remember if thats the ideal size for the Cobra conversion on my 1993 GT.

I've got 2000 Cobra R Brembos up front and SN95 Cobra brakes in the rear.

I've been running a GT master cylinder and stock fox booster for years and it required some effort but it worked. Figured since the engine bay is going back together now i'd try to perfect the braking system.

Any help would be appreciated.


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post #2 of 6 Old 07-20-2019, 11:51 PM
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I just picked up Cobra R brakes. I have been running cobra brakes for years now, but I was running the complete m-2300-k kit from way back in the day. This kit came with master and booster. I think you should be running 15/16” bore diameter for your master... I think. do the Cobra Brembos do a good job?

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post #3 of 6 Old 07-21-2019, 02:20 AM
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Uh, yeah, they're awesome and look great!
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post #4 of 6 Old 07-21-2019, 08:51 AM Thread Starter
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Quote:
Originally Posted by nelz View Post
I just picked up Cobra R brakes. I have been running cobra brakes for years now, but I was running the complete m-2300-k kit from way back in the day. This kit came with master and booster. I think you should be running 15/16 bore diameter for your master... I think. do the Cobra Brembos do a good job?
No complaints with my current setup. They stop reliably and consistently. There have been some panic stop situations where I've gotten a relatively hard pedal but the car still stopped without issue. I figured i'd upgrade since the car's engine by is completely apart "while i'm in there"

Wheel selection is a bit limited due to caliper clearance but i'm happy with my 95 R wheels.

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post #5 of 6 Old 07-21-2019, 01:58 PM
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I get the hard pedal too, but only after being in boost with my turbo setup.
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post #6 of 6 Old 08-21-2019, 05:33 PM
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Due to some complaints about pedal feel, Ford changed its M/C size to address those complaints. So the typical sn95 M/C size is 15/16" to 1-1/16" giving more firm to a more plush pedal assuming the same brake combo.

On my 86 GT, I was running the Cobra front brakes (I believe the 38mm PBRs) with 93 Cobra rears (45mm Varga with 10.25" rotor), and the 93 Cobra M/C with stock 86 booster. Pedal was very good - easy to modulate. Boost was more than enough. But I've upgraded to StopTech ST40s (4-piston) with 14" rotors, and swapped the rear to Cobra 38mm caliper and 11.675" rotors. According to StopTech, the ST40/14" is a perfect match for the Cobra rear. Given this I'm keeping the 93 Cobra M/C but moving up to the 93 Cobra booster because the stocker is done, and the motor is out making the install easier. Based upon my brake bias calculator, I expect the pedal to be about the same. Since the 00 Cobra Brembos are meant to work with the Cobra rear setup, I believe the 93 Cobra M/C should be OK. It's right in the middle and likely to provide great feed-back and modulation.

If you change the booster and/or M/C, be sure to get the brake rod length correct. See MM's M/C installation instructions for guidance.
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