1968 Manual Disk Brake Master Cylinder - Vintage Mustang Forums

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post #1 of 8 (permalink) Old 09-24-2002, 08:22 PM Thread Starter
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What type of master cylinder should I use when upgrading to manual disk brakes from drums (1968). I looked at Autozone site for a 68 manual disk master cylinder and they don't show one? Another parts store also could not find one and Mustangs Unlimited catalog doesn't show one either, just the power brake MC. Is their such a part or are the drum and disk MC interchangable? If I use a 74 Maverick MC will I be able to use my existing rod?


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post #2 of 8 (permalink) Old 09-24-2002, 08:38 PM
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I used the 74 Mav. Use the 68 rod.
post #3 of 8 (permalink) Old 09-24-2002, 08:45 PM
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the reason nobody shows one is because manual disc brakes weren't an option.
post #4 of 8 (permalink) Old 09-24-2002, 09:34 PM
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Use a 69-70 power brake master cylinder. Bore should be smaller than 1 inch and with correct manual brake pedal they work but not as good as a power disc brake set up Gary

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post #5 of 8 (permalink) Old 09-24-2002, 09:35 PM
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Do you have to change out the master cylinder? Why can't you just leave the Manual MC that is there in place?

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post #6 of 8 (permalink) Old 09-24-2002, 09:50 PM
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You need more fluid to move those big disk brake pistons!
post #7 of 8 (permalink) Old 09-25-2002, 12:02 AM
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You can, but the end result is that the car won't even begin to stop until the pedal is almost to the floor. This tends to cause soiled underwear (and other accidents).

.... it wouldn't be the first time reality took theory and conjecture out behind the woodshed and gave them a good thrashing.
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post #8 of 8 (permalink) Old 09-25-2002, 06:44 AM
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I don't know for sure but Mav MC doesn't have any larger bowls or piston diameter. Aftermarket MC might be needed if you have aftermarket saddles. However, if you use larger piston bore MC, the brake pressure will decrease unless you change your pedal to piston rod -ratio.

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