How to replace brake lines

[Bad_dude]

So what do you do to plug the metal line once the rubber hose is off? I don't want all of the fluid to flow out and having to bench bleed the MC. Or do you just lose a little fluid and the static force is keeping the remaining fluid in the line? So you just have air in the beginning part by the caliper.
Thanks.

[Leung]

So what do you do to plug the metal line once the rubber hose is off? I don't want all of the fluid to flow out and having to bench bleed the MC. Or do you just lose a little fluid and the static force is keeping the remaining fluid in the line? So you just have air in the beginning part by the caliper.
Thanks.

You only lose a small amount when you disconnect the rubber line from the hard part at the top, you might not lose anything if youre quick enough to swap the new on as soon as the old one comes off; i had a tiny drop that was it. You lose most of the fluid when you bleed the system to remove air.

[Bad_dude]

You only lose a small amount when you disconnect the rubber line from the hard part at the top, you might not lose anything if youre quick enough to swap the new on as soon as the old one comes off; i had a tiny drop that was it. You lose most of the fluid when you bleed the system to remove air.

Thanks. What about when you replace the calipers? How much fluid do you loose doing those?
Thanks.

[Leung]

Thanks. What about when you replace the calipers? How much fluid do you loose doing those?
Thanks.

Well when i bleed rebuilt calipers, i ususally go through 3/4th of a larger bottle of brake fluid bc im also trying to get the older darker fluid out also. I forget who did it but they used a really long hose and routed it back to the BMC reservoir so to not waste any fluid; basically looping it back full circle.

The shop i work for sells a lot of Centric brand brake hoses; im always delivering them to some dealers and a lot of shops.

[Bad_dude]

Well when i bleed rebuilt calipers, i ususally go through 3/4th of a larger bottle of brake fluid bc im also trying to get the older darker fluid out also. I forget who did it but they used a really long hose and routed it back to the BMC reservoir so to not waste any fluid; basically looping it back full circle.

The shop i work for sells a lot of Centric brand brake hoses; im always delivering them to some dealers and a lot of shops.

What I am worrying is when you replace the calipers, before you put the new caliper on, the fluid will all drip out and you have to bench bleed the MC. I saw a few videos the plug the line up while putting on the new caliper to avoid losing all of the fluid. Of course you need to bleed after the install but I want to avoid the bench bleeding part.
Thanks.

[Leung]

What I am worrying is when you replace the calipers, before you put the new caliper on, the fluid will all drip out and you have to bench bleed the MC. I saw a few videos the plug the line up while putting on the new caliper to avoid losing all of the fluid. Of course you need to bleed after the install but I want to avoid the bench bleeding part.
Thanks.

To keep the fluid from just dumping out, i just bend the rubber line, where it connects to the caliper with a banjo bolt, upward a little. I've never had fluid gush out or anything, it's not like anyone is pushing down on the brake pedal. so just have the new caliper right next to you when you undo the banjo bolt and quickly connect it to the new one as soon as you remove the line from the old one. At tops maybe a drop of fluid is lost.

When i was making a delivery before to a Tire Discounters, i had to deliver two calipers, i was told to wait a few minutes to take back the cores with me. That mechanic that was working on the car had the old ones off in a matter of seconds and the new reconnected faster than i could blink.