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04-11-2005, 02:44 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Is a 3/4" master cylinder too small for front brakes?
I'm using Wilwood GMIII single pot calipers on the fronts......would a 3/4" cylinder be too small? Should I go with an 1"?
I'm trying to find some small-sized cylinders since I have floor mounted pedals. Looking for a cylinder with the output fitting on the top instead of at the rear of the cylinder.
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04-11-2005, 03:07 PM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
Here's what I know about MC sizing... A smaller cylinder will put more pressure on the pads, but increase brake pedal travel. Mine are either 5/8ths or 3/4. The car had a 7/8 and 1 inch on when I bought it.
__________________
Jack
XSSIVE .....
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04-11-2005, 03:14 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
So you went down from an inch to a 3/4? I think my clutch and rear brake master cylinders are 3/4. I need a front one.
Anyone else?
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04-11-2005, 03:25 PM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
Basically yes. There were 2 different sized MC when I bought the car, 7/8 on the front and 1 inch on the rear. I went down in size because I wanted more pressure on the pads...manual brakes, but the pedal travel noticiably increased.
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Jack
XSSIVE .....
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04-11-2005, 03:39 PM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Not Ranked
In the interest of maintaining reasonable pedal force, I use 5/8 bore MCs. Yes the pedal travel is more than I'd prefer, but when I get on the pedal, at least enough pressure is generated to stop the car.
My pedal ratio is about 4:1, so I am disadvantaged in that way.
For 75 lb of pedal force (75 lb is more than you'd think) at a 4:1 ratio, with the balance bar set for 60% front and 40% rear, and using a 5/8 bore in both MCs, I produce about 586 psi front and 391 rear. I'd rather be doing about 750 psi, but for that I have to push harder than 75 lbs.
Just remember, larger bores require higher pedal force to produce the same braking action...
__________________
E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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04-11-2005, 04:38 PM
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CC Member
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Join Date: May 2001
Location: niceville fl,
fl
Cobra Make, Engine: Hunter #28; 396 Cleveland stroker; more than 495 HP; TKO 5 speed
Posts: 442
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Not Ranked
Do you have discs on the back?
My friend with vette brakes(no power) had to go to 5/8 frnt MC and 3/4 back MC inorder to get enough pressure to easily lock them without excessive pedal pressure. Standard is a 6/1 pedal ratio; ie, pedal length being 6in to pivot and 1" length to MC rod
gn
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04-11-2005, 04:54 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I'm using 4 wheel disc brakes.....10" rotors with single pot calipers on the rear, 10" rotors with big single pot calipers on the front.
I'm also using a Tilton floor mounted pedal assembly. It's showing a 4.5:1 ratio.
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04-14-2005, 03:35 PM
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CC Member
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Join Date: Mar 1999
Location: TACOMA,
WA
Cobra Make, Engine: Everett Morrision FE 427 so 2-4s
Posts: 2,025
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Not Ranked
I have an older EM with intermediate GM 10.5" front rotors and Jag inboard rears.I'm usind twin 3/4" Tiltons with an adjustable balance bar, no power assist.
Hydralic clutch came with 7/8" Tilton master cylinder .Not enough travel at slave to get full release and have any free travel clearence for the throwout bearing .I changed to 15/16" master cylinder .Takes a little more effort but have both release and free travel. As i remember a master cylinder kit is about $60.any size.
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Mike H
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