Bleeding front brake and brake fluid
Thread Starter
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Elite HDF Member
Joined: Jan 2006
Posts: 4,357
Likes: 11
From: The Lone Star State
Bleeding front brake and brake fluid
When swapping my front master cylinder is it necessary to completely bleed the line if I am just going to unhook the brake line from the old master cylinder and put in on the new one? \\; Also, I have the same bottle of DOT 4 brake fluid I used two years ago when I added the new brake line, is it still good or should I buy a new bottle? \\;
Extreme HDF Member
Joined: Sep 2006
Posts: 10,114
Likes: 29
From: Vancouver B.C. Canada
RE: Bleeding front brake and brake fluid
As long as the bottle is sealed tight, I don't see a problem. If the cap wasn't sealed properly, brake fluid could be contaminated.
This is how I look at it, if it is going to cost $10, I will get a new bottle, know what I mean?
This is how I look at it, if it is going to cost $10, I will get a new bottle, know what I mean?
Advanced
Joined: May 2006
Posts: 82
Likes: 0
From: Tennessee
RE: Bleeding front brake and brake fluid
I would say yes to both questions. \\;\\\\\\; Anytime you disconnect the brake lines you will get air in the system and bleeding is necessary to remove the air. I would get a new bottle of brake fluid if the seal is broken.
Intermediate
Joined: Jun 2008
Posts: 44
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From: bartlesville,oklahoma
RE: Bleeding front brake and brake fluid
if you have trouble bleeding brakes you can take a pump type oil can that is clean inside fill it with brake fliud,attach a rubber hose to oil can.then open bleeder in caliper and push clean brake fliud up into the master cyl.this will push the air out of the line.i would also get a new bottle of fliud
Elite HDF Member
Joined: Apr 2007
Posts: 4,984
Likes: 8
RE: Bleeding front brake and brake fluid
I dont think i would do the pump method with dot 4. if any is left in your line and it sprays it can get on your paint. dot 4 will eat your paint. I would change to dot 5 works fine and wont hurt your paint. just flush system and fil with dot 5.
ORIGINAL: custom roadglide
if you have trouble bleeding brakes you can take a pump type oil can that is clean inside fill it with brake fliud,attach a rubber hose to oil can.then open bleeder in caliper and push clean brake fliud up into the master cyl.this will push the air out of the line.i would also get a new bottle of fliud
if you have trouble bleeding brakes you can take a pump type oil can that is clean inside fill it with brake fliud,attach a rubber hose to oil can.then open bleeder in caliper and push clean brake fliud up into the master cyl.this will push the air out of the line.i would also get a new bottle of fliud
Extreme HDF Member
Joined: Sep 2006
Posts: 10,114
Likes: 29
From: Vancouver B.C. Canada
RE: Bleeding front brake and brake fluid
Or this (see picture) 
Pain in the S to manual bleed the brake
Pain in the S to manual bleed the brake
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Thread Starter
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Elite HDF Member
Joined: Jan 2006
Posts: 4,357
Likes: 11
From: The Lone Star State
RE: Bleeding front brake and brake fluid
thanks guys, I was leaning towards getting a new bottle anyway, it's cheap insurance and peace of mind. \\; Changing to DOT 5 won't damage the seals or anything in my calipers?
 \\;
What about DOT 4 residue in the line mixing with the DOT 5? \\;
 \\;
Thanks for the reccomendations on the tools, I will look into that. \\; I'm sure this won't be the last time I bleed the brakes. \\; I know \\;I will be swapping out my rear brake line for a SS braided one and I will eventually go to 16" apes which will require changing front brake lines again, plus I can add another tool to the box. \\;
 \\;
What about DOT 4 residue in the line mixing with the DOT 5? \\;
 \\;
Thanks for the reccomendations on the tools, I will look into that. \\; I'm sure this won't be the last time I bleed the brakes. \\; I know \\;I will be swapping out my rear brake line for a SS braided one and I will eventually go to 16" apes which will require changing front brake lines again, plus I can add another tool to the box. \\;
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