what size master cylinder bore?

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bluefish

bluefish

mopar dave
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3400# A body with 511, 10" Wilwood discs on front and 11" Dana drums on rear. Whats needed for bore size on the master cylinder?
 
I have a similar setup, but only 3.23 gears. 11" front disc, 11" drums in the rear. I am converting to manual brakes from power, and I'm using a 15/16" master cylinder. Larger bores get you shorter pedal throw but harder pressure needed to stop. Smaller bores get you longer pedal throw but easier pressure needed to stop.
 
Seems a large brake drum for that size car. Aussie A bodies had 9" drums, & 62-64 B bodies had 10" drums.
 
I'm running Wilwood 11" front and 11" drum on the rear of my 68 Barracuda with a 15/16" MC.
 
Bewy said:
Seems a large brake drum for that size car. Aussie A bodies had 9" drums, & 62-64 B bodies had 10" drums.
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US A-bodies had 9” drums too, and they were then, and are still, pathetic.

Better braking is never a bad thing.

For the OP, I run 15/16” master cylinders on all my manual disk cars. Best of both worlds. Good feel and brake modulation without too hard of a pedal or too long of a pedal stroke.

And I have run the 15/16” master with 11.75” disks up front and 11x2.5” drums out back, as well as with DoctorDiff’s 13” cobra kit up front and 11.7” disks out back. Like I said, better braking is never a bad thing.
 
Ok, I'm looking to up date my current master cylinder with 1 1/8 bore to a wilwood MC.
 
bluefish said:
Ok, I'm looking to up date my current master cylinder with 1 1/8 bore to a wilwood MC.
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1-1/8” is a pretty hard pedal. The 15/16” should give a longer stroke and a softer pedal comparatively.
 
72bluNblu said:
US A-bodies had 9” drums too, and they were then, and are still, pathetic.

Better braking is never a bad thing.

For the OP, I run 15/16” master cylinders on all my manual disk cars. Best of both worlds. Good feel and brake modulation without too hard of a pedal or too long of a pedal stroke.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^same here , but I cant lock them up -----------??
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I liked that 1 1/8 bore MC, on my factory disc E body but, as everyone has said, it was a little numb at the brake pedal. You could stomp on it and it would stop, without any fuss but, if I were gonna do any street driving smaller may have been better and that’s what is on my current toy. Now to be fair, I never played with pedal throw because, the leverage ratio can be used to correct some of the ills.
 
sst3193 said:
I liked that 1 1/8 bore MC, on my factory disc E body but, as everyone has said, it was a little numb at the brake pedal. You could stomp on it and it would stop, without any fuss but, if I were gonna do any street driving smaller may have been better and that’s what is on my current toy. Now to be fair, I never played with pedal throw because, the leverage ratio can be used to correct some of the ills.
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Thanks guys and i will give Wilwood a call to get their opinion as well.
 
Spoke with Wilwood today. They need your brake pedal ratio and the piston sizes in the calipers and or wheel cylinders. I have the 10" Abody 10.75 front disc kit and 11" Dana rear(1.8754"). They suggest a 15/16 or 1" bore MC. I found a slightly used Wilwood MC 260-13375P with 15/16 bore for $99 on Ebay. With see how this goes. Thanks guys.
 
I don't know if this helps but look at this


Screenshot_20180425-033759_Facebook.jpg
 
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