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Re: Brake prop valve install - front or rear - what’s your logic
[Re: Stanton]
#3226729
04/12/24 01:38 PM
04/12/24 01:38 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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Well, i don't run one. Just a standard, aluminum Omni ( if i remember, been 27 years) since i put it in. I do remember putting in a new one a few years back). If they have built in bias, mine is hooked up backwards to boot . Works great, at 158 mph, no problem! When you consider the difference in braking capacity differance between a 25x3.5 tire up front and a 33x 15 in back, plus rhe rears are a race compound, it all worked out perfectly for my Dart, even if by accident
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Brake prop valve install - front or rear - what’s your logic
[Re: gregsdart]
#3226741
04/12/24 02:41 PM
04/12/24 02:41 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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I ASSume we are talking discs all around, this is the race section after all. If so NO prop valve is needed, the piston size, just as in drums with a cylinder will "self regulate". Do yourself a favor and buy a brake pressure gauge and learn about the relationship of pedal ratio and pressure. If you simply want to be able to adjust the amount of fluid moved between the front and rear then by all means ad a prop valve. But it is not a REQUIREMENT for a 4 wheel disc set up.
FWIW I have NEVER run one with a 4 wheel disc set and never had an issue. This includes cars I have built for myself and other to include cars with carbon and carbon/steel rotors. I've owned two ex pro stockers and they do not use one. All my cars we use a brake pressure gage to set them up and with pedal pivot/arm relationships and m/c bore size to achieve the correct pressure its never been an issue.
If you have front disc and rear drums then yes you will need a prop valve. The reasoning is the area of the wheel cylinder and disc piston being different.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Brake prop valve install - front or rear - what’s your logic
[Re: Stanton]
#3226781
04/12/24 08:56 PM
04/12/24 08:56 PM
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Joined: Jun 2005
Posts: 5,102 Western Md.
skicker
"The Champ"
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"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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I noticed in the other post about someone using one on the fronts and thought it was a little weird...
Then I think back to last summer when I put a few passes on the Dart on a less than ideal road and understand why they do it...
Under hard braking you can hear the fronts trying to squeal and have to let off the brake a little...
Had I had a valve on the front I could have used more brake and not had a problem...
FWIW mine is just standard 73 A Body spindles up front with 3.5" skinnies...
While the rear is the typical 10" x 2.5" rear drums...
Mines slow and only runs about 110 mph...at speeds earlier discussed I would add a prop valve to the front of mine...
...FAFO...
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