Re: Dual brake system necessary part
[Re: SportF]
#3222435
03/23/24 10:55 PM
03/23/24 10:55 PM
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Joined: Jan 2003
Posts: 15,377 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,377
Omaha Ne
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it differentiates in that is serves two purposes. 1. Being a cut off valve as mentioned. 2. Providing a "PRESET" amount of proportioning or delay to the rear brakes. There are valves that do one or the other A. bypass valve for isolating the leaking side. B. Proportioning valve for delaying application of the rear brakes. The pictured valve does both, hence the term "Combination valve". These types of valves are typically non- adjustable so one has to be careful when selecting them as they may or may not work as desired in a modified braking system depending on a bunch of other variables.
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Re: Dual brake system necessary part
[Re: SportF]
#3222468
03/24/24 08:25 AM
03/24/24 08:25 AM
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Joined: Dec 2014
Posts: 5,830 ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,830
ohio
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Here is the best picture of a "proportioning valve" I have seen. This is the valve necessary to give you the dual brake system "cut off the leaking side" brakes. Wrong. A dual circuit master cylinder is what's necessary. Any other valves are for fine tuning. There's numerous OEM applications that are plumbed with the front brakes straight to the master and rear brakes may have a proportioning valve or an ABS valve.
Angry white pureblood male
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Re: Dual brake system necessary part
[Re: ruderunner]
#3222475
03/24/24 09:08 AM
03/24/24 09:08 AM
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Joined: Jan 2008
Posts: 1,212 Minn
SportF
OP
pro stock
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OP
pro stock
Joined: Jan 2008
Posts: 1,212
Minn
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Go to your car without a valve and open a bleeder. The pedal is going to go to the floor. Period. I wanted to stir things up, which I why I posted.
But, I doubt I can change your mind. Last summer, two different tracks, two "dual" masters, brake leak and pedal goes to floor because, no valve. Both mopar type masters.
Also, there is no delay in rear brake apply. The proportion part is a set pressure regulator limiting pressure to rear to prevent lockup.
I'm done, have a nice day.
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Re: Dual brake system necessary part
[Re: SportF]
#3222495
03/24/24 10:52 AM
03/24/24 10:52 AM
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Joined: Dec 2005
Posts: 11,579 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,579
Fulton County, PA
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Is this a race car?
Street car, the brake warning light may need to be functional and all the parts there to pass inspection. Otherwise, it's not used on race cars. Not much chance of rusted brake lines or old hoses blowing out.
Design the system correctly, use the right parts, plumb it correctly, and you likely won't need any kind of band aid valve.
If the results don't match the theory, change the theory.
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Re: Dual brake system necessary part
[Re: SportF]
#3222496
03/24/24 10:54 AM
03/24/24 10:54 AM
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Joined: May 2019
Posts: 6,261 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,261
nowhere
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Go to your car without a valve and open a bleeder. The pedal is going to go to the floor. Period. I wanted to stir things up, which I why I posted.
But, I doubt I can change your mind. Last summer, two different tracks, two "dual" masters, brake leak and pedal goes to floor because, no valve. Both mopar type masters.
Also, there is no delay in rear brake apply. The proportion part is a set pressure regulator limiting pressure to rear to prevent lockup.
I'm done, have a nice day. There most assured is a delay, but it is to the discs. It's called hold off. Then there is hinge point where the rate of pressure increase to the drums is slowed due to the self energizing function of modern drum brakes. And the aforementioned proportioning. What trucks are you talking about?
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Re: Dual brake system necessary part
[Re: SportF]
#3222531
03/24/24 01:10 PM
03/24/24 01:10 PM
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Joined: Dec 2014
Posts: 5,830 ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,830
ohio
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Go to your car without a valve and open a bleeder. The pedal is going to go to the floor. Period. I wanted to stir things up, which I why I posted.
But, I doubt I can change your mind. Last summer, two different tracks, two "dual" masters, brake leak and pedal goes to floor because, no valve. Both mopar type masters.
Also, there is no delay in rear brake apply. The proportion part is a set pressure regulator limiting pressure to rear to prevent lockup.
I'm done, have a nice day. I've been in plenty of vehicles with blown brake lines here in Ohio. So, I've played your game. Yes the pedal has extra travel but, one half of the brake system still works. So here's a challenge to you. Disconnect a line at the master and plug the port. Your pedal may feel ok, but you're still only operating half the brakes.
Angry white pureblood male
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