Go Back   DIY Go Kart Forum > Building Plans And Advice > Go Kart Discussion

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 05-23-2010, 09:44 AM
r_chez_08's Avatar
r_chez_08 r_chez_08 is offline
Should be in the shop...
 
Join Date: Jan 2009
Location: Cornwall, UK
Posts: 4,847
Thanks: 182
Thanked 310 Times in 305 Posts
Default Bleed brakes

How do you do this?
__________________
My process of thought:
Anyone can drive a fast car, few can drive a car fast.
  #2  
Old 05-23-2010, 10:16 AM
devino246's Avatar
devino246 devino246 is offline
Official DIYGK Chem Nerd
 
Join Date: Sep 2009
Location: Lynchburg, VA
Posts: 3,871
Thanks: 270
Thanked 277 Times in 243 Posts
Default

Heres how i was taught to do it.

Your going to need a helper to pump the brakes. You'll need a bucket to catch the brake fluid. There should be a little bleed screw on the caliper.

Have your helper apply pressure to the brake pedal and open the bleed screw. Brake fluid will squirt out along with little bursts of air. Close the screw and tell your helper to let off the brake pedal. Your helper MUST keep their foot on the pedal while the bleed screw is open. If they let off it'll suck in air. Repeat this until only fluid squirts out.
__________________
ASE Certified
  #3  
Old 05-23-2010, 10:35 AM
anderkart's Avatar
anderkart anderkart is offline
Moderator
 
Join Date: Apr 2009
Location: Phoenix Arizona USA
Posts: 5,345
Thanks: 300
Thanked 772 Times in 683 Posts
Default

Gravity bleeding is another method I use sometimes. With this you simply loosen your calipers (or wheel cylinders) bleeder screw and let gravity slowly force brake fluid (and the air pockets) through the system. You'd just need to make sure you keep the master cylinder full while bleeding.

On go karts, sometimes its necessary to elevate the front of the kart up so your master cylinder is quite a bit higher than the caliper or wheel cylinder for this method to work.
  #4  
Old 05-23-2010, 01:16 PM
r_chez_08's Avatar
r_chez_08 r_chez_08 is offline
Should be in the shop...
 
Join Date: Jan 2009
Location: Cornwall, UK
Posts: 4,847
Thanks: 182
Thanked 310 Times in 305 Posts
Default

K thanks. Somehow when I put a bolt on my sprocket, it caught the caliper, and the bolt loosened, and fluid came out of the hole, letting air in.
__________________
My process of thought:
Anyone can drive a fast car, few can drive a car fast.
  #5  
Old 05-26-2010, 12:13 PM
r_chez_08's Avatar
r_chez_08 r_chez_08 is offline
Should be in the shop...
 
Join Date: Jan 2009
Location: Cornwall, UK
Posts: 4,847
Thanks: 182
Thanked 310 Times in 305 Posts
Default

Ok I bought some new fluid and put it in, but now I hear you shouldn't mix fluids, will this really matter on a kart? I am not sure what the original is.
__________________
My process of thought:
Anyone can drive a fast car, few can drive a car fast.
  #6  
Old 05-26-2010, 12:47 PM
Eric492 Eric492 is offline
Member
 
Join Date: May 2010
Posts: 89
Thanks: 2
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by devino246 View Post
Heres how i was taught to do it.

Your going to need a helper to pump the brakes. You'll need a bucket to catch the brake fluid. There should be a little bleed screw on the caliper.

Have your helper apply pressure to the brake pedal and open the bleed screw. Brake fluid will squirt out along with little bursts of air. Close the screw and tell your helper to let off the brake pedal. Your helper MUST keep their foot on the pedal while the bleed screw is open. If they let off it'll suck in air. Repeat this until only fluid squirts out.
easiest way to do also if you slide a clear hose on the bleed screw and run the hose to your catch can and step on the brake till you stop seeing bubbles of air in the hose.
  #7  
Old 05-26-2010, 12:53 PM
The_Machine The_Machine is offline
Senior Member
 
Join Date: Apr 2010
Location: GA/AL
Posts: 136
Thanks: 1
Thanked 9 Times in 8 Posts
Default

tapping along the length of the brake line with something like a screwdriver helps get the little air bubbles out. before installing a brake line to a kart i usually hang the resevoir to the tree, tap along the line and let it sit for a long time
The Following User Says Thank You to The_Machine For This Useful Post:
ck123 (01-20-2013)
  #8  
Old 05-26-2010, 05:55 PM
anderkart's Avatar
anderkart anderkart is offline
Moderator
 
Join Date: Apr 2009
Location: Phoenix Arizona USA
Posts: 5,345
Thanks: 300
Thanked 772 Times in 683 Posts
Default

Chez, I'm pretty sure any Dot 3 (or better yet) Dot 4 type brake fluid would work just fine in your kart. Some race karts use the Silicone Dot 5 type but I really think yours would of had just regular old brake fluid in it.

There's some pretty good info about the 3 different types here:
http://importnut.net/brakefluid.htm
  #9  
Old 05-26-2010, 08:41 PM
bajagokart's Avatar
bajagokart bajagokart is offline
Senior Member
 
Join Date: Jan 2010
Location: Red Deer, Alberta, Canada
Posts: 781
Thanks: 0
Thanked 17 Times in 17 Posts
Default

why the frick do you need Dot 5 for lol
__________________
I'M SO PUMPED! - Adam Savage
  #10  
Old 05-26-2010, 10:28 PM
fowler's Avatar
fowler fowler is online now
Senior Member
 
Join Date: Nov 2009
Location: Bullsbrook West Aus
Posts: 5,382
Thanks: 64
Thanked 468 Times in 413 Posts
Default

does the arrow on the master cylender point up or down
__________________
That's not an oil leak
It's horsepower sweat
  #11  
Old 05-27-2010, 06:56 AM
Chris T. Chris T. is offline
Junior Member
 
Join Date: Jan 2010
Location: Ontario, Canada
Posts: 16
Thanks: 1
Thanked 0 Times in 0 Posts
Default

Dot 4 is all you need and that's the recommended fluid to use. Just be sure to keep a eye on your reservoir, if this gets to low and sucks air, you'll have to start all over again. Just keep it topped up and you'll be fine
  #12  
Old 05-27-2010, 12:39 PM
r_chez_08's Avatar
r_chez_08 r_chez_08 is offline
Should be in the shop...
 
Join Date: Jan 2009
Location: Cornwall, UK
Posts: 4,847
Thanks: 182
Thanked 310 Times in 305 Posts
Default

Ok, I will check what the stuff I bought, all I know is it is sinthetic.
__________________
My process of thought:
Anyone can drive a fast car, few can drive a car fast.
  #13  
Old 05-27-2010, 05:21 PM
freakboy's Avatar
freakboy freakboy is offline
the names 'mater
 
Join Date: May 2009
Location: hick town
Posts: 4,012
Thanks: 134
Thanked 91 Times in 80 Posts
Default

Quote:
Originally Posted by bajagokart View Post
why the frick do you need Dot 5 for lol
sprint car racing.. drag cars without chutes.. purpose built race cars like modifeds nascar... that kinda stuff the fun FAST stuff.
__________________
Pardon me, sir gangster! but it apears your pants are declining in elevation!
  #14  
Old 05-05-2012, 03:25 PM
R∆√∑Я R∆√∑Я is offline
Junior Member
 
Join Date: May 2012
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default

hello everyone I bought a go kart yesterday its mission impossible bleeding the brakes no matter what i try the fluid dont wanna come through an i checked the cylinder seals and checked for blockages etc an it appears fine to me. im really stuck on this 1. anyone got any ideas how to force the fluid through?. or knows if its supposed to take ages to bleed brakes on a go kart?

dunno if i did right thing postin here but couldn't see point starting new thread about brakes lol.
  #15  
Old 05-05-2012, 05:19 PM
Doc Sprocket's Avatar
Doc Sprocket Doc Sprocket is offline
Moderator
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 15,517
Thanks: 684
Thanked 2,072 Times in 1,638 Posts
Default

First, describe your bleeding procedure in great detail, to make sure you're doing it right. Failing all else, you may need to bench-bleed the master first, and/or use a vacuum-bleeder rig.
__________________
Treat it as you would an aircraft frame and you should have no problems. -Name Withheld
The Manual- "Just the manufacturer's opinion of how to put this together."- Tim "The Tool Man" Taylor
Put down the wrench, and come out with your hands up!- Me!
Wrench, Wheel, Wreck, Repeat...
  #16  
Old 05-05-2012, 05:25 PM
Rustydog2010's Avatar
Rustydog2010 Rustydog2010 is offline
NZ Nutta :|
 
Join Date: Jan 2010
Location: New Zealand
Posts: 946
Thanks: 13
Thanked 42 Times in 37 Posts
Default

Pressure bleeder?

If you need to do it by yourself you can use a special trick. set it up normally, but put some clean fluid in the bottom of the container. When then put the hose in, making sure it is at the bottom, submerged in fluid. Open the nipple. Now just pump the brake a dozen times. Close the nipple, and check the pedal travel and feel.

Easy as.
__________________
I weld naked, for an all over tan!
The Following User Says Thank You to Rustydog2010 For This Useful Post:
ck123 (01-20-2013)
  #17  
Old 05-05-2012, 05:33 PM
christeeezy christeeezy is offline
Custom User Title
 
Join Date: Dec 2011
Location: Cali grown.
Posts: 39
Thanks: 6
Thanked 1 Time in 1 Post
Default

Or you can get a clean grease canister from your auto parts store, throw brake fluid in it, and attach the hose to the caliper bleed screw. Open up the bleed screw half a turn and pump the canister until no more bubbles come out of the reservoir.
__________________
:ninja: Custom Ninja 250cc shifter project in the works :ninja:
  #18  
Old 05-06-2012, 02:19 PM
R∆√∑Я R∆√∑Я is offline
Junior Member
 
Join Date: May 2012
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default

thankyou 2 everyone who replied u have given me some good info. i been trying to work on it today by 1 of us on the pedal and the other 1 doing the bleed nipple on the caliper with no luck yet again. im going to try most of above tomorrow when car shops open so can get some hosing.

other than that i found a complete used set on ebay.
im just hopin i can get him to sell buy it now or find someone else to sell me a set who aint chargin rip off prices in the uk.

thanks again.
  #19  
Old 07-02-2012, 09:26 AM
timbowuff timbowuff is offline
Member
 
Join Date: Apr 2012
Location: ontario
Posts: 60
Thanks: 2
Thanked 0 Times in 0 Posts
Default

also when putting new fluid in, how much do you put in? do you just fill up the spot where the fluid goes in or what??? lol i know im a real noob especially with brakes like this.
  #20  
Old 07-02-2012, 09:35 AM
Fabroman's Avatar
Fabroman Fabroman is offline
Moderator
 
Join Date: Nov 2011
Location: Sydney, Australia
Posts: 11,304
Thanks: 530
Thanked 1,806 Times in 1,517 Posts
Default

That depends on whether or not you have an external reservoir. If you do, fill it to the max line. if not fill the master slowly until it's full
__________________
Nothing is impossible to fix if you have enough time, money & patience

2013 Build-off Winner http://www.diygokarts.com/vb/showthread.php?t=21076
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:42 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.