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Ecklers AutoMotive
Username Post: Make all brake lines 1/4"?        (Topic#357924)
Eth727 
Silver Supporting Member
Posts: 204
Eth727
Loc: San Diego
Reg: 04-17-19
09-03-19 02:45 PM - Post#2774758    

Hey gang I bought 3/16" and 1/4" brake lines. I was wondering if I could just make all of the lines 1/4 just to keep it simple.
Thanks



 
Ecklers AutoMotive
Mel Foye 
*VIP* Founding Member
Posts: 4839
Mel Foye
Reg: 09-29-00
09-03-19 07:33 PM - Post#2774778    
    In response to Eth727

I do not see a reason to change size from stock. My thinking is the larger the line the more pedal travel will be needed. I maybe wrong.
Why are you changing existing lines?



 
Eth727 
Silver Supporting Member
Posts: 204
Eth727
Loc: San Diego
Reg: 04-17-19
09-03-19 07:57 PM - Post#2774779    
    In response to Mel Foye

I'm putting a dual MC so I need a new rear line. I had another line that was rusty. So I have one line going to the MC which is 1/4. I thought stock was a combination of mostly 3/16 and two lines going to the MC 1/4". What do y'all think?



 
japete92 
"5th Year" Silver Supporting Member
Posts: 1239
japete92
Loc: No. Virginia
Reg: 01-18-13
09-04-19 07:56 AM - Post#2774807    
    In response to Eth727

Because pipe diameter impacts pressure, I think you are treading into an area of design that has risks.

Are you confident you know what impact the increase in line diameter will have on your brakes (parts and performance)?

I like to stay within the GM engineers' parameters.

Your call.

Pete





 
Eth727 
Silver Supporting Member
Posts: 204
Eth727
Loc: San Diego
Reg: 04-17-19
09-04-19 08:53 AM - Post#2774813    
    In response to japete92

I don't know that's why I put this post.



 
threeimpalas 
Senior Member
Posts: 1183

Loc: Central Iowa
Reg: 02-21-02
09-09-19 07:46 PM - Post#2775198    
    In response to Mel Foye

1/4" line will be a bit more difficult to bend and route than 3/16" line, but if you'd prefer to use it from pedal to wheel, go ahead. It won't cause any adverse issues.

  • Mel Foye Said:
...the larger the line the more pedal travel will be needed.



The larger diameter won't affect pedal travel. It will simply require slightly more brake fluid when initially filled.

  • japete92 Said:
Because pipe diameter impacts pressure...



It's a closed system. The pipe diameter does not affect the line pressure.

You're likely thinking of the master cylinder and caliper/wheel cylinder piston diameters (and their related areas). The former area affects how much pressure is generated for a given input force, while the latter affects how much force is exerted by a given line pressure.

Mike
'58-62s and 348/409s


 
LtFrankDrebin 
Super Senior Member
Posts: 5252
LtFrankDrebin
Loc: Coopersburg, PA
Reg: 01-25-01
09-10-19 07:46 PM - Post#2775297    
    In response to threeimpalas

With a larger pipe diameter, you're moving a larger volume of fluid, but I don't think that really matters. However, the larger pipe diameter -> the less resistance in moving that fluid. I know in the electrical world, going with a bigger wire gauge than necessary is OK, because resistance becomes less; you don't want to go with a smaller than necessary wire gauge. At what point do the factory brake lines go from 1/4" to 3/16"? Curious to see if maybe the change in brake line sizes was used as a crude method of proportioning more braking power to the front.

'56 210 Townsman wagon 6cyl/3spd OD | '58 Impala Sierra Gold 348


 
threeimpalas 
Senior Member
Posts: 1183

Loc: Central Iowa
Reg: 02-21-02
09-11-19 10:33 PM - Post#2775375    
    In response to LtFrankDrebin

  • LtFrankDrebin Said:
With a larger pipe diameter, you're moving a larger volume of fluid...



The same amount of fluid moves whether the lines are 3/16 or 1/4. Remember, it's a closed system that's supposed to be full (no empty air space in system). The only volume that moves is the amount that's displaced at the wheel cylinder in order to activate the pads/shoes.

Mike
'58-62s and 348/409s


 
Original58 
Contributor
Posts: 517
Original58
Loc: Manitoba, Canada
Reg: 10-30-13
09-12-19 05:57 AM - Post#2775380    
    In response to threeimpalas

The way I understand it is that it is piston size...whether its in the master cylinder or wheel cylinder that determines the amount of force exerted not the line size.

Jeff

1958 Biscayne 283 Turbo-Glide 31,000 mi (now 35,000 and counting) driven daily
1966 Mustang Inline 6- C4 57,000 mi and growing daily
1929 Graham - Paige 612- the eternal headache that I will never sell


 
Ecklers AutoMotive
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