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Manual master cylinder

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Old 12-23-2014, 11:56 AM
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what difference between OEM brake cylinder bore 1.00 and aftemarket cyl.bore 1.032?
I agree what 1981TA's post #19.
Old 12-23-2014, 01:14 PM
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The smaller bore master will produce more pressure, but not move the volume. If you have say a 4 piston caliper setup in the rear and a 2 piston(race caliper) in the front then the smaller bore is fine as it will not require the volume to move the pads like a full 4 piston system will.

Both will stop the car, it is common if you have too small of a bore to have to pump the pedal a time or two to get the pedal to come up. The larger bore will require a bit more effort, but the pedal will not move as much. The smaller bore will require less effort, but travel further.
Old 12-30-2014, 02:10 PM
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I am running a tandem master for manual brakes (old school Mopar aka Strange master) with factory LS1 brakes. You will need a new pushrod, it will require some basic fabrication along with pedal drilling for more pedal leverage.

Personally I prefer the feel of manual brakes because I'm used to sensitive braking. GM has a bit of dead space at the top of the pedal travel and it pisses me off. If I hit the brake pedal I expect calipers to bite immediately. Oh and I can still brake with the motor off.
Old 01-02-2015, 11:53 AM
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Originally Posted by axe murderer
The Strange Mopar MC comes in 2 bore sizes, 1.031 & 1.125.
For some reason everyone that sells the kits on here push the 1.125 bore, I've talked to the guys from Strange on the phone & in person and they ALWAYS have said with stock brakes use the 1.031 bore.
Kind of curious why the manufacturer recommendation differs from the ls1teech vendors.
MOST with manual brakes are ditching the booster for weight as a race car. Race cars with bigger brakes need the larger bore master to compensate for larger piston volume.
Old 01-18-2015, 09:58 PM
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All the Ls1tech vendors and a couple race shops I talked to offered the 1.032 and 1.125 cylinders in their kits. Vendors and Strange all told me to go with the 1.032 if I was using the stock brakes and 1.125 for race brakes.

I went with the Burkhart Chassis kit, I liked the way the line lock was attached to the master cylinder. I use the 1.032 bore master with stock brakes, the car stops so much better than I thought it would.
Old 01-20-2015, 06:58 PM
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I've wondered about doin this also. Good thread op.

Did you leave the abs in place?
Old 01-20-2015, 10:51 PM
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Originally Posted by HioSSilver
I've wondered about doin this also. Good thread op.

Did you leave the abs in place?
No, ABS is completely gone on my car.



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