TimC
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| posted on 28/1/18 at 06:39 PM |
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Leaky brakes - Male 3/8 stainless threads into brass 3-way union.
Hi All,
I’m wondering if I’ve missed a trick (or golden rule) here. I’ve gone to fill my front brakes for the first time and have leaks - two I think on the
same brass 3-way union where flexible hoses with male fittings are screwed in. Should I not have used this method? Should I have used a stainless
3-way connector? Any other idea what’s gone wrong? The hex-heads on the flexi hoses are tight against the union body.
On the plus side, I’ve used silicon fluid so I don’t have a whole lot of nasty stuff leaking all over the car but it looks like all the lines will
have to come off which is bad news!!
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cliftyhanger
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| posted on 28/1/18 at 07:05 PM |
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. My thoughts are that "normally" a flexi will seal by it pressing against the copper flare. Otherwise it will need a copper washer to
seal the shoulder of the flexi against the body of the union. ( like they are used on a caliper)
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ste
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| posted on 28/1/18 at 07:07 PM |
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If the hex head is touching the union it means the flexi hoses don't have long enough threads to get the end to meet the bottom of the union.
That is where it seals.
take them apart and measure the depth of the union, you may be able to trim a small amount off to get them to bottom out and seal. otherwise
it's new ends on the flexis, or a shallower union or an adapter.
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voucht
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| posted on 28/1/18 at 07:21 PM |
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also check that seats on the flexi hose fittings match the seats in the bottom of the tee piece : convex seat should seal against a concave seat. If
you have convex seats on both the flexi (male) and the tee-piece (female), then here is your problem. Same if you have concave seats on both of them.
https://vouchtroadster.blogspot.com/
https://cafrazx550.blogspot.com/
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TimC
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| posted on 28/1/18 at 07:26 PM |
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Thanks all,
It all makes sense - I think Ste probably has root cause. I never thought about it which is dull in hindsight. This will be painful - lots of rivets
holding p-clips to drill out.
Bugger.
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CosKev3
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| posted on 28/1/18 at 07:32 PM |
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I would use copper washers as suggested above 
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mark chandler
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| posted on 28/1/18 at 07:54 PM |
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Copper washers here as well, lasted 12 years so far without issue
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TimC
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| posted on 28/1/18 at 08:21 PM |
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Really Chaps? Good (safe) enough?
I’ll get some ordered.
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CosKev3
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| posted on 28/1/18 at 08:23 PM |
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Yeah,as suggested above they use them on some caliper's
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CosKev3
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| posted on 28/1/18 at 08:40 PM |
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They will only work if the ends are fixed though,not swivels?
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TimC
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| posted on 28/1/18 at 08:44 PM |
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quote:
Originally posted by CosKev3
They will only work if the ends are fixed though,not swivels?
They are all fixed.
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