Thread: 3/16" vs 1/4" brake line

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Well actually-since the fluid flow will be increased from the smaller diameter------------the pressure will be reduced----------or is that just in airflow????

Originally Posted by Smockdoiley

I know this is a really old thread but it popped up on a Google search. I just want to say to anybody seeing this post, don't be an idiot. LARGER BRAKE LINES REDUCE PRESSURE!!!!!!!!!!!!!!!!!!!!!!!!!! The increase in volume from the enlarged lines will reduce the pressure because the MC now has to move more fluid. When you increase fluid you reduce pressure. So the moron posting on here about how line size doesn't change pressure is a complete tool. Henry Rifle is flat out wrong!!!!!!!!!!!!!!!!!! Ask me how I know? Oh, I work for the largest aftermarket brake company in the county, pretty easy to figure out.

Please educate, but please don’t sling mud. Let your words of wisdom lead, not names.
BUT, Please show us the correct way.

Originally Posted by Smockdoiley

Nope, I'm good. I think having accurate information in this post is more important than someone's feelings. He's presenting himself as a know it all and correcting everyone else when he is in fact wrong. Change the mc bore, brake line diameter or braking bore sizes and you affect the pedal feel as well as pressure. To say otherwise is inaccurate information which is a very bad thing when talking about brakes.

I agree bad info is bad info. Instead of chastising, please show us your info is correct.

Originally Posted by Smockdoiley

I think it's pretty comical to care more about someone's feelings or reputation than the safety of someone who stumbles upon this thread and grabs wrong information. You think just because it was written 13 years ago that it won't be read by someone now? So no, I don't care how old this thread is if Google is still giving it to people. So you'd rather the forum carry incorrect information for an entire generation of hot rodders? Yea, that's really smart. Sure makes you and the forum look great. But hey, you attached your name defending said practices. Good for you. It's called ego, you should check it. Get a lot farther in life.

Please, I want to learn, teach me…

Line size is determined by the volume of fluid to move the actuator it operates . Pressure is set by the pump . Brakes are either power assist or manual. With manual the brake pedal ratio gives you the assist . bore size controls fluid volume and pedal travel .

I don't think we have that time or manpower to dig up every thread made in the last 20 years and correct any advice that is wrong.

i saw nothing wrong with it . certainly not anything dangerous . drum brakes always use 1/4 in lines .

JMHO, Jack showed impressive math to back up his statements, I would like "Smockdoiley" to show his formulas/data to back up his claims. No disrespect intended, and not arguing either, just want to learn

My analogy of the garden hose/fire hose theory is it speaks of volume supply only. Once the hose size is increased the pressure will drop IF the supply volume can not keep up with the demand.

In a closed hydraulic/brake system (not open ended as the garden hose), in theory the pressure should remain equal as long as the volume supply remains equal.

JMHO, if the smaller line does indeed increase pressure, it would only increase the pressure momentarily and only before the source of the restriction (smaller line size). Thus, in theory the pressure increase would be at the master cylinder and not at the caliper or hydraulic device, at least that's my understanding.

Of course, I'm no expert and welcome any education..

Originally Posted by 36 sedan

No disrespect intended, and not arguing either, just want to learn

JMHO, if the smaller line does indeed increase pressure, it would only increase the pressure momentarily and only before the source of the restriction (smaller line size). Thus, in theory the pressure increase would be at the master cylinder and not at the caliper or hydraulic device, at least that's my understanding.

Of course, I'm no expert and welcome any education..

Nailed it. The entry point of the smaller line will register a higher pressure momentarily, but once the pads / shoes come into contact the pressure will balance across the system.

An extremely small moment, given the extremely small compression factor for hydraulic fluid.

Originally Posted by 36 sedan

Please educate, but please don’t sling mud. Let your words of wisdom lead, not names.
BUT, Please show us the correct way.



I agree bad info is bad info. Instead of chastising, please show us your info is correct.



Please, I want to learn, teach me…

That was beautifully phrased; one of the most diplomatically written put-downs I've seen in a very long time.

In essence you told him to put up or shut up; but cleverly phrased in such a way that no umbrage could be taken.
Bloody gorgeous.
Love it.

I note Smockdoiley hasn't responded nor been onsite in over two months
Do you feel guilty 36 Sedan?
I wouldn't if I were you...
Well done.

As Sgt. Joe Friday (Dragnet) would say, "just the facts". Lol..

Originally Posted by 36 sedan

As Sgt. Joe Friday (Dragnet) would say, "just the facts". Lol..

Actually nothing but a troll trying to stir up s+++ and I am not diplomatic.

Originally Posted by NTFDAY

Actually nothing but a troll trying to stir up s+++ and I am not diplomatic.

WHO you calling a troll???

Originally Posted by 36 sedan

who you calling a troll???

::lol::lol::lol::lol::lol::lol::lol::d

Smockdoily was just parroting what he had been told. No original thoughts had existed, he simply didn't / doesn't know. Maybe he'll come back? With a … Oh Yeah?????? Well my boss says.. blah blah blah.

All good, I'll love the debate, if it comes.