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Old 12-04-2018, 04:51 PM   #1
vulvalover
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Default How to cap a brake line on a 740?

Anyone know how to add a cap to a brake line on a 740?

https://www.autopartswarehouse.com/b...rman/rbh380227
This is the line I'm trying to cap. I've taken off the part that screws into my caliper - Or maybe I should say I've taken off the caliper and am trying to cap that part of the line that screws into it.

I grabbed a 3/8th in 16 and 24 thread acorn nut. Neither really screw onto threaded protrusion of the line. I get about 1 rotation with the 3/8th 24 acorn nut.

Did I grab the wrong sized acorn nut? Do I need a M10 1.0 fine threaded acorn nut? I am having trouble finding these if anyone can provide a link? What can I do to cap a line - besides crimping it or destroying it from further use?

Before any trollsone complains I'm not using my caliper - I'm trying to get a rebuild kit but it's going to take a lot more time to refit the caliper than it is to cap the brakes. So in the meantime I'd like to cap it.
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Old 12-04-2018, 05:11 PM   #2
VB242
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If you depress the brake pedal halfway and are clever enough to make something to hold it there, it will keep most of the fluid in the system. The MC only lets fluid in when the pedal is completely up, partially depressed blocks the feed holes.
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Old 12-04-2018, 05:22 PM   #3
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Yep just fold over a stripped out hard line and use that for a plug in the flex line.
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how psi stock cna support?

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Old 12-04-2018, 06:38 PM   #4
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Maybe an 1/8" NPT cap with female threads. 1/8" NPT is nearly the same thread as M10-1.0. If you're trying to do male threads use a 1/8" NPT plug with male threads. 3/8 x 24 threads won't work. 1/8" NPT has 27 threads per inch.
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Last edited by lummert; 12-04-2018 at 06:44 PM..
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Old 12-05-2018, 02:31 AM   #5
MasterBlaster
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Quote:
Originally Posted by vulvalover View Post
I grabbed a 3/8th in 16 and 24 thread acorn nut.
Did I grab the wrong sized acorn nut?
Yes.
Quote:
Do I need a M10 1.0 fine threaded acorn nut?
Yes.

Quote:
Before any trolls one complains I'm not using my caliper


As long as you're not planning on driving on the street, do whatever you want.

If you brake hard and the front end yanks to the side enough for you to plow into a crowded bus stop, be sure to apologize for any deaths that result.

if you're about to stop for those children in the crosswalk and the "wrong size" cap pops off, you lose brake fluid pressure, and you run them all down, explain to the parents at the funerals that you have a rebuild kit coming "real soon".


https://www.dormanproducts.com/p-457...ose&origin=YMM

End 1 Fitting Type: Male - M10 X 1.0
End 2 Fitting Type: Female - M10 X 1.0




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Old 12-05-2018, 08:44 AM   #6
freevolvos
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Rubber hose ,clamp, bolt shoved in the end, another clamp your just trying to keep the fluid from leaking out rite?
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Old 12-05-2018, 10:00 AM   #7
M.H. Yount
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Simply top up the reservoir on the master cylinder, and put a piece of tape over the vent hole in the cap. Nary a drop will leave the open line on the other end.
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Old 12-05-2018, 11:07 PM   #8
freevolvos
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Quote:
Originally Posted by M.H. Yount View Post
Simply top up the reservoir on the master cylinder, and put a piece of tape over the vent hole in the cap. Nary a drop will leave the open line on the other end.
If this works..........BRILLIANT DEAR SIR
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Old 12-05-2018, 11:58 PM   #9
M.H. Yount
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It's in year, oh about 40, for anything with an easily sealable reservoir cap --- it only works every time. Have also put a bit of plastic over the reservoir and then attached cap to seal it off. Important to top up reservoir. If air can't get into the top, fluid can't get out the bottom - like holding your finger over the end of a straw.
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Old 12-06-2018, 08:34 AM   #10
freevolvos
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I never thought of that..That's why I love this board makes total sense
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