Replaced front brake line, now no front brakes

K

killer305

Member

May 19, 2003

27

0

• Apr 17, 2005

• #1

I crashed a couple weeks brack, and took out my front brake like in the process, litterally ripping it in half. So anyway i got a new moose front brake like and brake lever and went out today to install it. So at first i left the cover off the master cyclinder and just keep on trying to bleed the brakes. I would pull the lever about 5-10 times, hold it, open up the bleeder screw and close it, then let go of the lever and repeat the process. so after doing that for a hour and a half i figured i must be doing something wrong so i looked at the service manual and it said to keep the cover on. Ok so i put the cover on and did it again. still no pressure at all. So i go and get my one man bleeder and try that. There was no air in the system. So now im getting bull****, The MC is pushing the fluid out to the bleeder valve so i dont know what is going on. I have no pressure whatsoever. Can someone give me a little help? Thanks :bang:

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

8,575

0

• Apr 17, 2005

• #2

When I cchange brake lines I use a MityVac to get the air out. You can also use a plastic syringe and a piece of aquarium tubing to pump fluid in from the bottom. Works evry time :cool:

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

8,575

0

• Apr 17, 2005

• #3

Here is a website CLICK ME

 

K

killer305

Member

May 19, 2003

27

0

• Apr 17, 2005

• Thread starter
• #4

im pretty sure all the air is out of the line, Ill try using a syringe to suck the brake fluid out and make sure, but if that dosnt work what do you think would be the problem

 

K

killer305

Member

May 19, 2003

27

0

• Apr 17, 2005

• Thread starter
• #5

also when i am sucking the line with the syringe, i should have the lever pulled in right?

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

8,575

0

• Apr 17, 2005

• #6

What you want to do with the syringe is open the bleed screw and PUMP fluid in from the bottom until all the air is out. Make sure you have no air in the syringe or tubing and pump it thru. It helps to have another person with a rag to catch the overflow from the reservoir

 

K

killer305

Member

May 19, 2003

27

0

• Apr 17, 2005

• Thread starter
• #7

Wouldnt it make more since to suck the fluid out than blow it threw? Im not going to be damaging the MC at all by backfeeding it? Im guessing using your method until no more air is coming out the the resevoir. I will try it tommorow and check back in with the results.

 

N

nickyd

Member

Sep 22, 2004

873

0

• Apr 17, 2005

• #8

follow the directions you're being told - with a new brake line it will be full of air and you might pump it for 3 weeks before you get pressure - it needs to be reverse bled (push fluid with a syringe from the bleed screw UP to the master cylinder - you will not damage it - don't touch the lever - leave it out).

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

8,575

0

• Apr 18, 2005

• #9

Works EVERY time :nod:

 

G

Gazza2005au

Member

Mar 27, 2005

117

0

• Apr 18, 2005

• #10

when bleeding the brakes u should have a tube on the bleeder so it stops the air from rushing back into the brakes ;)

 

R

Rcannon

~SPONSOR~

Nov 17, 2001

1,886

0

• Apr 18, 2005

• #11

If the seals in the mastercylinder go bad, thsi can happen. However, your brake was working before the change. The new line will hold a lot of air. Way more than the stock mastercylinder can push out.

Do what was suggested by the other members before getting worried about the mastercylinder. I always dred changine a front line for the same reason.

It is slightly easier if you attach the top of the new line, fill the cylinder and line, then wait for fluid to drip out of the bottom before you attach it to the caliper.