www.DTSFab.com Desert Sand and Trail Fabrication for the off road enthusiast, driver, and builder - discussion forums, on line store, and advice - your one stop off road shop.

  • September 22, 2017, 10:56:36 AM *
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search  

News:

Aftershock Motorsports:

Custom Buggy Parts     Honda 250 Odyssey Buggy Parts     Honda 350 Odyssey Buggy Parts     Honda 400 Pilot Buggy Parts
Pages: [1] 2   Go Down

Author Topic: Brake Line Size  (Read 1595 times)

0 Members and 1 Guest are viewing this topic.

Welcome to DTSfab.com. Please post a short introduction .


YOU MUST BE LOGGED IN TO VIEW PHOTOS / ATTACHMENTS.

We are very glad you found us. Membership is free to all.
If you like what you are reading why not sign up as a member so you can see all of what DTS has to offer?

For those that like a bit more risque,less PG atmosphere we have the VIP room for only $20.00 a year.

Whichever membership you choose you will find a wealth of information to help you along with your project whether it be for Desert Trail or Sand.



Please enjoy the site.


By the way; this pesky message goes away when you join! What are you waiting for? Join Now.


fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Brake Line Size
« on: July 14, 2014, 06:23:39 PM »
What size lines are you guys running for hard lines from master cylinder/s to calipers? Reason I ask is because on this buggy with 4 piston calipers front and rear using separate m/c's for front and rear and 1/8 inch lines the brakes have always felt"sluggish" both on apply and release. I can't describe it any better than that. I'm thinking the 1/8" lines between the m/c and the T to each caliper are the issue. Any opinions?
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

fastcorvairs

  • Lifetime VIP
  • *
  • If it is worth doing!!!!!! Do it in the sand

  • Offline Offline
  • Posts: 2713
  • Location: Clearwater Kansas U.S.A.
Re: Brake Line Size
« Reply #1 on: July 14, 2014, 06:47:47 PM »
What size lines are you guys running for hard lines from master cylinder/s to calipers? Reason I ask is because on this buggy with 4 piston calipers front and rear using separate m/c's for front and rear and 1/8 inch lines the brakes have always felt"sluggish" both on apply and release. I can't describe it any better than that. I'm thinking the 1/8" lines between the m/c and the T to each caliper are the issue. Any opinions?

I'v never got a firm turn brake handle using -3 braided line.  I get a good firm foot brake but never the turn brakes.  I power bled vacuum bled and foot pumped and still can't get a firm turn brake.  No air in lines.  Even put die in it one time to be sure there was no air.   
Logged


If I believe I cannot do something it makes me incapable of doing it. But when I believe that I can, then I acquire the ability to do it , even if I didn't have it at the beginning.

BDKW1

  • Hero Member
  • ****
  • Offline Offline
  • Posts: 896
  • Location: Easton, KS
Re: Brake Line Size
« Reply #2 on: July 15, 2014, 12:14:17 PM »
1/8" hard line and -3 braided line on everything including 6 piston CNC calipers. Have someone step on the brakes and watch the calipers for movement. Not having them perfectly lined up with the rotor is the #1 cause of crappy brake feel.
Logged

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #3 on: July 15, 2014, 07:05:14 PM »
Yep,checked that a long time ago.  1/8" lines and -3 braided just as you.   Wilwood cylinders with balance bar.   It's not crappy pedal. It's a sluggish response I feel. Like a time delay of application.    Never had this on anything before.
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #4 on: July 15, 2014, 07:31:07 PM »
Gear One brakes.
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

BDKW1

  • Hero Member
  • ****
  • Offline Offline
  • Posts: 896
  • Location: Easton, KS
Re: Brake Line Size
« Reply #5 on: July 15, 2014, 09:09:59 PM »
I would not run Gear Ones if they were paying Me. Wiwood or Brakeman. Or Brembo if you have the money.
 
Also, Tilton MC's work by far the best of any I have used. Wilwoods are second and CNC's are garbage.
 
 
What pads are you running?
Logged

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #6 on: July 15, 2014, 09:41:55 PM »
I agree. No more G1 ever again.  I think they were the green pads.
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

Dunebound69

  • Hero Member
  • ****
  • Time flies when drinking rum!

  • Offline Offline
  • Posts: 995
  • Location: Lincoln, NE
Re: Brake Line Size
« Reply #7 on: July 17, 2014, 06:53:33 AM »
Try a larger master cylinder.  Do you have a residual pressure valve in the system?
Logged

Time flies when having rum!
Famous last words, Watch this
Government can not give you anything it dose not take from someone else first. When we stop laughing we start dying.
"When you stop doing things for fun you might as well be dead" Hemingway

Carlriddle

  • Another build? What are you thinking?
  • VIP
  • *
  • Online Online
  • Posts: 4341
  • Location: Rome, Georgia
Re: Brake Line Size
« Reply #8 on: July 17, 2014, 08:22:20 AM »
I'm running 3/4" mc(i think bought from DS) and 1/8" hard line all way to single 4 piston wildwood caliper.   I had less than 1" pedal movement before lockup, so I put air into line so I had a little more pedal play.  Crazy but work well.  Got an eye on a steal on front brake setup for car then mc will be sized proper, I hope. 

But brakes may have to wait as I've made offer on new love pad for mistress.  Then all my girls will be back under one roof?   rofl rofl
Logged

You can keep your CHANGE, I'd like to keep my DOLLAR.

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #9 on: July 17, 2014, 11:43:41 AM »
I'm running 3/4" mc(i think bought from DS) and 1/8" hard line all way to single 4 piston wildwood caliper.   I had less than 1" pedal movement before lockup, so I put air into line so I had a little more pedal play. Crazy but work well.  Got an eye on a steal on front brake setup for car then mc will be sized proper, I hope. 

But brakes may have to wait as I've made offer on new love pad for mistress.  Then all my girls will be back under one roof?   rofl rofl
WHAT??????????????????????? ??? ??? ??? ???
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

Carlriddle

  • Another build? What are you thinking?
  • VIP
  • *
  • Online Online
  • Posts: 4341
  • Location: Rome, Georgia
Re: Brake Line Size
« Reply #10 on: July 17, 2014, 12:21:24 PM »
Brake pedal moved maybe 1" before lockup.  So I cracked the bleeder and now its perfect.  Mc was too big for single caliper system.

This is no way correct I guess.   nono
Logged

You can keep your CHANGE, I'd like to keep my DOLLAR.

dsrace

  • VIP
  • *
  • my one true weakness

  • Offline Offline
  • Posts: 5091
    • WWW
Re: Brake Line Size
« Reply #11 on: July 17, 2014, 01:47:06 PM »
if you only had to throw the pedal 1" and it would lock up the rear while moving with little effort in the 1" then you had it pretty much right on, if you felt that was too touchy then you actually need the next largest bore master cyl. if the pedal goes rock hard in 1" but doesn't lock up or apply the brakes solid then you have 1 bore size master cyl to large. this is the way i have always judged it, all of course if your close to begin with.
Logged

Don't never argue with an Idiot!
Because he will drag you down to his level and beat you with experience

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #12 on: July 17, 2014, 08:03:13 PM »
Brake pedal moved maybe 1" before lockup.  So I cracked the bleeder and now its perfect.  Mc was too big for single caliper system.

This is no way correct I guess.   nono
I guess I'm missing something. Cracking the bleeder would do nothing for pedal travel.  ??? ??? ???
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)

Carlriddle

  • Another build? What are you thinking?
  • VIP
  • *
  • Online Online
  • Posts: 4341
  • Location: Rome, Georgia
Re: Brake Line Size
« Reply #13 on: July 18, 2014, 05:47:59 AM »
I guess I'm missing something. Cracking the bleeder would do nothing for pedal travel.  ??? ??? ???

Its the opposite reason most bleed brakes I'd guess?  I also wrapped brake line where it passes exhaust.  Heat worked like parking brake Enemy is looking to use.  That seemed to help a lot too.  Whatever I did fixed the issue in my eye.
Logged

You can keep your CHANGE, I'd like to keep my DOLLAR.

fabr

  • Administrator
  • *
  • Online Online
  • Posts: 90536
  • Location: SE Kansas
Re: Brake Line Size
« Reply #14 on: July 18, 2014, 06:05:54 AM »
You should not have but 2 PSI residual pressure in the brake line with disc brakes. Not enough to apply brakes or even move the caliper pistons but enough to keep air out of system. If you were holding enough pressure to have exhaust heat expand the brake fluid and cause issues,your MC was not traveling to fully retracted position between brake applications or you have a MC for drum brakes that hold 10-20 psi line pressure. Fully retracted pressure in the MC is zero for either disc or drums. The residual valve is holding line pressure at approx 2 psi but the MC itself will have zero pressure till reapplication of brakes. 
« Last Edit: July 18, 2014, 06:13:04 AM by fabr »
Logged

"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein  (IT'S OFFICIAL THAT DAY IS HERE NOW!)
Pages: [1] 2   Go Up