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Cobra brakes upgrade
#1
Hi

Im doing the Cobra brake upgrades, is it nessecary to use Hydroboost ? or will the standard vacuumbooster be enough to push the calipers ?

Regards Rob

For knowing your limit you have to pass it thumb
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#2
Only reason to go to hydroboost is lack of engine vacuum.
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#3
(08-22-2018, 09:13 AM)Bentworker Wrote: Only reason to go to hydroboost is lack of engine vacuum.

Great Thanks :-)

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#4
Rob, I assume your referring to the 93-2004 Mustang Cobra brakes. The hydroboost came into play on those models in 96 when the 4.6 DOHC engine was installed and clearance became an issue with the huge heads. The 93-95 Cobra's with the 5.0 ran the typical master cylinder/booster set up. I have 04 Cobra brakes on my 85 GT with the OE master cylinder and booster and have had no issues at all. There was a larger booster for the 93-95 Cobra's but sold the one I had to a friend who restores Fox Mustangs after I discovered my brakes worked fine without it.
If you have something really nasty under the hood resulting in some low vacuum, then you would need to use a hydoboost or a vacuum motor.
You will also need to run at least a 17" rim for clearance on the much larger  calipers.   
Good luck on your project!     Smile

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#5
(08-22-2018, 10:15 AM)secluff Wrote: Rob, I assume your referring to the 93-2004 Mustang Cobra brakes. The hydroboost came into play on those models in 96 when the 4.6 DOHC engine was installed and clearance became an issue with the huge heads. The 93-95 Cobra's with the 5.0 ran the typical master cylinder/booster set up. I have 04 Cobra brakes on my 85 GT with the OE master cylinder and booster and have had no issues at all. There was a larger booster for the 93-95 Cobra's but sold the one I had to a friend who restores Fox Mustangs after I discovered my brakes worked fine without it.
If you have something really nasty under the hood resulting in some low vacuum, then you would need to use a hydoboost or a vacuum motor.
You will also need to run at least a 17" rim for clearance on the much larger  calipers.   
Good luck on your project!     Smile

Thanks

The brakes are from a 04 , 351c but I Think there is enough vacuum. 17" rims is already on :-)

Regards Rob

For knowing your limit you have to pass it thumb
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#6
Just my opinion. Hook up a vacuum gauge at idle and see what you have. I'm not sure I would trust my brakes (IE my life) to "I think there is enough vacuum."

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#7
(08-22-2018, 12:41 PM)73pony Wrote: Just my opinion. Hook up a vacuum gauge at idle and see what you have. I'm not sure I would trust my brakes (IE my life) to "I think there is enough vacuum."

Vacuum gauge is already hooked on and I belive I can see manifold pressure in the Sniper EFI Handheld. How much should I aim for to be on the safe side ? on idle I have about 65 kpa thats about 19inHg , I also have a vacuum canister.

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#8
WOW! 19 in at idle? That is awesome and should be plenty. I was getting around 12-13 at idle. In the process of swapping out the intake, carb, and distributor right now. We will see what I have when done.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#9
you'll be fine

I've been running them and I have 12-14" vacuum depending on my tune and it is not a problem, though I do run a vacuum canister

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#10
Thats sounds great thanks :-)

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