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Brake problems after 5 lug swap..
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<blockquote data-quote="Mustang5L5" data-source="post: 15937029" data-attributes="member: 38517"><p>If you still have the rear drums on the car, you really shouldn't be installing a 4-wheel disk MC on the car, as the piston size is much too large for the amount of fluid required by wheel cylinders. There really isn't an ideal MC for use with some of the SN95 front disk setups when retaining rear drums, so the "best" MC to use is the stocker.</p><p></p><p>The 99-04 GT PBR's caliper surface area is only 10% larger than the stock fox MC. Result will be a slightly softer pedal.</p><p></p><p>The 1993 Cobra MC piston area is almost 2X the area of the stock fox MC so you area oversizing the MC by almost 40%. This increase in area is to account for rear disks, which require more fluid to move than smaller wheel cylinders. That's why there really isn't an ideal MC for a Sn95 front disk/rear drum setup. The stock MC actually gets you the closest unless you want to try and plumb in an 79-81 Fox MC with power brakes which has a 7/8" bore in it (~10% larger than stock). I wouldn't.</p><p></p><p>Only thing I can say to try with your setup, OP, is to install the prop valve plug on the front of the combo valve, and install the adjustable unit. Bleed the brakes with it full open and see if that allows you to stock. Those front calipers are pretty powerful and you should be able to put yourself into the windshield (not literally) when you hit the pedal.</p></blockquote><p></p>
[QUOTE="Mustang5L5, post: 15937029, member: 38517"] If you still have the rear drums on the car, you really shouldn't be installing a 4-wheel disk MC on the car, as the piston size is much too large for the amount of fluid required by wheel cylinders. There really isn't an ideal MC for use with some of the SN95 front disk setups when retaining rear drums, so the "best" MC to use is the stocker. The 99-04 GT PBR's caliper surface area is only 10% larger than the stock fox MC. Result will be a slightly softer pedal. The 1993 Cobra MC piston area is almost 2X the area of the stock fox MC so you area oversizing the MC by almost 40%. This increase in area is to account for rear disks, which require more fluid to move than smaller wheel cylinders. That's why there really isn't an ideal MC for a Sn95 front disk/rear drum setup. The stock MC actually gets you the closest unless you want to try and plumb in an 79-81 Fox MC with power brakes which has a 7/8" bore in it (~10% larger than stock). I wouldn't. Only thing I can say to try with your setup, OP, is to install the prop valve plug on the front of the combo valve, and install the adjustable unit. Bleed the brakes with it full open and see if that allows you to stock. Those front calipers are pretty powerful and you should be able to put yourself into the windshield (not literally) when you hit the pedal. [/QUOTE]
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Brake problems after 5 lug swap..
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