jps
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| posted on 27/7/23 at 06:43 PM |
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Best ways to blank hydraulic brake lines
It looks like I’m going to be left with one or possibly two ports to blank off in my brake system.
1 - an outlet from my brake master cylinder. I have 4 but am only using 3, leaving a 10mm outlet that needs blanking off.
2 - one of the outlets from a brass t-piece on the bulkhead. I *might* use this to fit a pressure switch but if not the t-piece is still a very useful
way to break up a long run of brake pipe so I will install it regardless. If I don’t use the third port on the t-piece it’ll need blanking off.
These are both female ports which take m10 threaded unions with concave seats in the port. To blank off do I use a suitably short m10 bolt with a
copper washer so it seals on the outer shoulders of the ports? Are there specific blanking unions I should use? Should I be putting bleed nipples into
these ports? Or is there a mystery 4th solution…?
[Edited on 27/7/2023 by jps]
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rusty nuts
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| posted on 27/7/23 at 06:49 PM |
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Once upon a time some master cylinders came with blanking pugs made for the job . I had a couple I used to blank off pipes when making up new metal
brake pipes
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JAG
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| posted on 27/7/23 at 07:47 PM |
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I've used a male fitting and a suitable ball bearing in the past.
Find a ball bearing that fits in the port. It should sit low in the port so that you can then screw the male fitting in, on top of the ball
bearing.
Works a treat 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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theconrodkid
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| posted on 28/7/23 at 06:15 AM |
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bleed nipple , why make life more complicated and therefore prome to failure ?
who cares who wins
pass the pork pies
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Mr Whippy
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| posted on 28/7/23 at 08:15 AM |
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Use the spare line it to add a pressure gauge to the dash and say its a race thing 
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jps
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| posted on 28/7/23 at 12:38 PM |
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quote:
Originally posted by theconrodkid
bleed nipple , why make life more complicated and therefore prome to failure ?
I guess my concern on this is whether it will seat sufficiently well to seal. Maybe I’m overthinking the DIN/SAE issue but thought the concave seats
were different angles - I understand it’s negligible when there’s a brake pipe being crimped up in the join, wasn’t sure whether it might be
problematic when it’s steel bleed nipple onto brass t-piece…
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JAG
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| posted on 28/7/23 at 01:20 PM |
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Bleed Nipple will work perfectly well - if you have a spare it's probably the best solution 
But a brake pressure guage would be a cool addition to the dashboard. It needs to read 0-80 bar or 0-1200 psi.
[Edited on 28/7/23 by JAG]
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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adithorp
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| posted on 29/7/23 at 07:13 PM |
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Bleed nipple. Designed for the job.
Some slave cylinders have 2 identical outlets and just use different holes for pipe and bleed on opposite sides of the car.
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gremlin1234
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| posted on 30/7/23 at 05:53 PM |
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quote:
Originally posted by jps
wasn’t sure whether it might be problematic when it’s steel bleed nipple onto brass t-piece…
it certainly used to be possible to get brass bleed screws
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pigeondave
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| posted on 31/7/23 at 12:37 PM |
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Yep another vote for nipples (again)
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adithorp
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| posted on 31/7/23 at 06:27 PM |
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quote:
Originally posted by pigeondave
Yep another vote for nipples (again)
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