brake line fitting

[Exoter175]

Originally Posted by cdcox

I'm not sure what you mean by contained. Yes, the brake fluid is contained in the brake system consisting of the reservoir, master cylinder, brake lines and slave cylinders at the wheels.

I am not assuming the system is pressurized. It transitions from unpressurized before breaking to pressurized while you are breaking.

If the fluid were truly incompressible, the length of the line would not matter theoretically. Because brake fluid is slightly compressible, it has a very small effect that is not important in a practical sense.

What I mean is that your assumption is that reduction of brake line length from wits design, won't matter because fluid can't be compressed.

However, what I am getting at is that while the pressure of the fluid at contact won't be likely to change, the time at which it takes the pressure to contact at each caliper will change. The braking system is specifically designed so that each wheel when the brake pedal is applied,w ill brake simultaneously. If you remove the distance that the fluid needs to "travel" it applies before the other and we create a problem.

What I keep trying to point out here, is that the braking system here isn't completely fluid filled like you guys are envisioning, there is travel involved due to the design of the system, and because of that travel, reduction or addition of designed length, will change the braking dynamics of the vehicle.

Again, I want to reiterate the fact that I fully understand, agree, and comprehend what you are saying about a system where it is completely fluid filled full of a liquid that cannot be compressed, and how that makes length no longer matter.

I'm just here to tell you that the scenario you are juxtaposing, isn't applicable because that is not how the braking system is designed.

[cdcox]

Originally Posted by Exoter175

What I keep trying to point out here, is that the braking system here isn't completely fluid filled like you guys are envisioning,

Assume I am a tiny man and I am dropped onto the fluid surface of the master cylinder reservoir and I have to travel to the pressure face of the slave cylinder. Are you telling me that I don't have to swim through brake fluid the whole way, but that I will need to hike part of the distance because the system is not completely filled with fluid? Show me a schematic.

[Exoter175]

Originally Posted by Dallas Chief

Yeah...you. You have been at this for two hours bro. Your a fuggin mechanic, and you work for the man. Piling on Jason about your Pitt State schooling (I wouldn't be tooting my horn too loudly about that yeeesh!) and your tardo certification tests. At least he has the balls to strike out on his own AND stick with it. I figure his business probably pulls in $300k a year based on what he said. Right nice little operation for a small town I would say.

Quit being an obnoxious n00b around here and . Olathe... explains it all.

I take it you didn't read much, at all. In all likelihood I have more experience owning and operating a business than he does. And according to him, I've struck out twice now. Which makes your point moot. On top of that, I take it you have no idea what you are talking about in terms of automotive schooling, as Pitt State is one of the very BEST in the region. I actually make more money because of my degrees and certs than my buddy who went to UTI, which is widely regarded as "the best" school in the country. Obviously my Pitt State experience isn't as bad as you seem to think it is.

I'd actually be surprised if his business is even marginally profitable going off of his ticket numbers, I can't say for certain what he should be pulling, but I'd doubt it is at 300k given his location and "competition" he touted earlier.

Originally Posted by Flachief58

So, you're saying that when there is no pressure applied to the pedal there is no fluid in the lines?

This is going to be hard to describe unless you have the understanding of the system that I do, but I'll attempt to answer the question.

On one hand, no. I am not saying that. On the other hand, you are under the assumption that the lines are 100% filled, 100% of the time. That isn't the case here, which is the point I keep trying to drive through to you.

Originally Posted by cdcox

Assume I am a tiny man and I am dropped onto the fluid surface of the master cylinder reservoir and I have to travel to the pressure face of the slave cylinder. Are you telling me that I don't have to swim through brake fluid the whole way, but that I will need to hike part of the distance because the system is not completely filled with fluid? Show me a schematic.

Terrible analogy here, but basically, sort of yes.

I'll try my best to explain in the most basic of forms and to a degree it will be inaccurate, only to get you into the broadened idea of how this works.

In a sense, when the car is on and running, the system is almost always pressurized to a degree, so that you won't have to hike your happy ass from point a to point b. However, it is impossible for the braking system to operate under constant pressure. There has to be a relief. Furthermore, different braking pressures must be applied at different points of the vehicle (proportioning valve). Furthermore, there are times when the system is not "pressurized" (IE, the lines are not 100% full) and the mechanic action of the system itself is required to sufficiently work the brakes.

If I can give you any example that doesn't require extreme cranial usage to understand, I'll put it like this. When your car is off, key off, and you pump your brakes a few times, you notice a change in pedal pressure. Do you know why?

[cdcox]

Originally Posted by Exoter175

If I can give you any example that doesn't require extreme cranial usage to understand, I'll put it like this. When your car is off, key off, and you pump your brakes a few times, you notice a change in pedal pressure. Do you know why?

No. Enlighten me.

[Exoter175]

Originally Posted by cdcox

No. Enlighten me.

Now you're just trolling. Goodnight.

[cdcox]

Originally Posted by Exoter175

Now you're just trolling. Goodnight.

No, honestly I'm not. I'm one of the straightest shooters on here. I'm still skeptical, but curious and willing to learn.

If the lines are not full all of the time I would think there has to be a way to vent air from the lines. This is the part that makes me skeptical.

[Exoter175]

Originally Posted by cdcox

No, honestly I'm not. I'm one of the straightest shooters on here. I'm still skeptical, but curious and willing to learn.

If the lines are not full all of the time I would think there has to be a way to vent air from the lines. This is the part that makes me skeptical.

Ever put brake fluid into your master cylinder? Ever seen bubbles come out of it?