Brake hoses - preventive maintenance - Page 2 - BMW M5 Forum and M6 Forums
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post #11 of 21 Old 30th October 2018, 06:49 AM
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Mine just ruptured a few days ago, just ordered the ECS stainless lines and hope to install them this weekend.
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post #12 of 21 Old 27th March 2019, 12:51 AM
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I'm about to do this soon and I was thinking about the best way to get the air out of the new hoses. I can't activate the ABS pump so I was thinking of replacing the lines, then going for a drive and activating the pump by slamming on the brakes a few times. That should move the air pocket from the hose downstream to the rest of the circuit, which will then come out once I bleed the brakes.


Thoughts?

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post #13 of 21 Old 27th March 2019, 02:47 AM
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One of my 2 brake lines under the hood sprung a leak a few months ago.

I replaced all my lines with SS stop-tech.
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post #14 of 21 Old 27th March 2019, 03:13 AM
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Happened to me too just last month, hose burst spraying fluid all over the exhaust manifold, makes sense they would fail considering where they are located.
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post #15 of 21 Old 27th March 2019, 05:37 AM
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Quote:
Originally Posted by kiznarsh View Post
I'm about to do this soon and I was thinking about the best way to get the air out of the new hoses. I can't activate the ABS pump so I was thinking of replacing the lines, then going for a drive and activating the pump by slamming on the brakes a few times. That should move the air pocket from the hose downstream to the rest of the circuit, which will then come out once I bleed the brakes.


Thoughts?
That's a pretty common method but can't say it's a 100% guarantee it'll be fully bled.

You can put INPA or DIS on a laptop to bleed the brakes? I did mine with INPA but the last owner used to use DIS.

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post #16 of 21 Old 27th March 2019, 06:04 AM
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Originally Posted by offroadkarter View Post
That's a pretty common method but can't say it's a 100% guarantee it'll be fully bled.



You can put INPA or DIS on a laptop to bleed the brakes? I did mine with INPA but the last owner used to use DIS.
I'd prefer to activate the pump but I have the Bavarian Technic cable (enthusiast version) and last time I checked, it didn't have that capability. I'll see how the pedal feels and if it's really bad, I'll buy the INPA software.

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post #17 of 21 Old 27th March 2019, 06:06 AM
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Originally Posted by kiznarsh View Post
I'd prefer to activate the pump but I have the Bavarian Technic cable (enthusiast version) and last time I checked, it didn't have that capability. I'll see how the pedal feels and if it's really bad, I'll buy the INPA software.
you're in the state with probably the largest collective of m5 enthusiasts, someone in so cal might help you out with bleeding w/ inpa or dis.

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post #18 of 21 Old 27th March 2019, 02:00 PM
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Quote:
Originally Posted by kiznarsh View Post
I'm about to do this soon and I was thinking about the best way to get the air out of the new hoses. I can't activate the ABS pump so I was thinking of replacing the lines, then going for a drive and activating the pump by slamming on the brakes a few times. That should move the air pocket from the hose downstream to the rest of the circuit, which will then come out once I bleed the brakes.


Thoughts?
Why would need to worry about the ABS pump activation if you do not introduce air upstream of the unit? You can mitigate the flowrate of fluid out a connection by filling the reservoir all the way to the top edge and tightly sealing it with plastic wrap stretched over the top and secured with a rubberband. Keep an eye on it to make sure that the reservoir doesn't leak down too far when you have a line open for replacement. Alternatively, you can use one of those tools to hold the brake pedal depressed just enough to block the inflow ports, and I suppose almost no fluid will run out.

Hence, just do one or some version of above, replace all the hoses, and flush the system well. (and then still get stuck with the mr bock issue, lol).

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post #19 of 21 Old 27th March 2019, 06:57 PM
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Why would need to worry about the ABS pump activation if you do not introduce air upstream of the unit?
I can't find a drawing right now that shows the entire circuit, but it's my understanding that power bleeding the brakes doesn't impact lines 1 & 2, hence the air pockets in the new hoses which are downstream of those lines don't get bled out.

As long as the bleeder screws on the calipers are closed, replacing hoses 3 & 4 should have no impact on the fluid that starts at lines 5 & 6 and goes all the way to the rear calipers. Activating the pump forces the air downstream into the part of the circuit that will get bled out. At least that's my assumption without seeing the full circuit diagram.



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post #20 of 21 Old 27th March 2019, 07:42 PM
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Quote:
Originally Posted by kiznarsh View Post
I can't find a drawing right now that shows the entire circuit, but it's my understanding that power bleeding the brakes doesn't impact lines 1 & 2, hence the air pockets in the new hoses which are downstream of those lines don't get bled out.

As long as the bleeder screws on the calipers are closed, replacing hoses 3 & 4 should have no impact on the fluid that starts at lines 5 & 6 and goes all the way to the rear calipers. Activating the pump forces the air downstream into the part of the circuit that will get bled out. At least that's my assumption without seeing the full circuit diagram.
Anything downstream of the furtherest upstream connection that is disconnected will have air bubbles that need to be pushed through it. As long as a connection is not undone (and air is not introduced) upstream of the ABS unit, you should be fine. Brake fluid flows right through #1 & 2 all the time, and bleeding will or course force fresh fluid through them. In other words, all fluid flowing from the master cylinder to the calipers will only be flowing through those lines.

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