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seized brake line union??

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Old Apr 13th, 2018, 21:23   #1
Greybeard
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Default seized brake line union??

Hi all, whilst replacing discs and pads I noticed a damp area round the flexi hose to solid pipe union in the left wheel arch, I needed to remove the caliper anyway so thought to fix the leak at the same time. So tried disconnecting the union, no go, apparently seized, am I missing something? If you look at the attached pic it shows the upper flexi pipe and lower solid pipe but there's some weird oval spring thing? is this locking the union? or does it just need more muscle? Don't want to bugger it up!
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Last edited by Greybeard; Apr 13th, 2018 at 21:44.
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Old Apr 13th, 2018, 22:06   #2
jpliddy
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Default 940 tdi auto 1995

hi you can see this how it comes apart on tube i think . been wanting to swop my hoses for a while now and service brake calipers quite a few on here know how to do this job im sure too
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Old Apr 13th, 2018, 22:22   #3
manxdog
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Pipe nut screws into your flexi hose, there is some "nobbles" that locate flexi onto that bracket and spring clip is supposed to hold it steady so you can undoe your pipe nut.
Works ok on a new car but when its approaching 30, its a differant story.
Take 2 smallish hammers, hold 1 against the flexi where nut is and give opposite side a good square crack or 3.
Then use a pair of mole grips (carefully) hold flexi just above bracket then use a good tight fitting spanner and it should come undone.
Good luck!
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Old Apr 13th, 2018, 23:01   #4
Laird Scooby
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Worth dousing it before you start with a 50/50 mix of acetone and synthetic ATF - give it a good shake after mixing then squirt it on so it can get at the threads. Let it soak a few minutes and it should undo nicely.
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Old Apr 13th, 2018, 23:39   #5
Greybeard
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Thanks Guys thought it was straightforward, will have a crack tomorrow.
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Old Apr 14th, 2018, 20:17   #6
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Quote:
Originally Posted by Laird Scooby View Post
Worth dousing it before you start with a 50/50 mix of acetone and synthetic ATF - give it a good shake after mixing then squirt it on so it can get at the threads. Let it soak a few minutes and it should undo nicely.
Like that one ....
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Old Apr 15th, 2018, 19:35   #7
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Quote:
Originally Posted by Laird Scooby View Post
Worth dousing it before you start with a 50/50 mix of acetone and synthetic ATF - give it a good shake after mixing then squirt it on so it can get at the threads. Let it soak a few minutes and it should undo nicely.
Can you mix a bottle full and keep it
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Old Apr 15th, 2018, 19:45   #8
Laird Scooby
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As long as you seal it to prevent the acetone evaporating off, yes. Don't forget to give it a good shake before decanting it for use to make sure it's still mixed as it has a tendency to separate when stored for some reason.
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Old Apr 14th, 2018, 17:15   #9
kelvinp
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Quote:
Originally Posted by manxdog View Post
Pipe nut screws into your flexi hose, there is some "nobbles" that locate flexi onto that bracket and spring clip is supposed to hold it steady so you can undoe your pipe nut.
Works ok on a new car but when its approaching 30, its a differant story.
Take 2 smallish hammers, hold 1 against the flexi where nut is and give opposite side a good square crack or 3.
Then use a pair of mole grips (carefully) hold flexi just above bracket then use a good tight fitting spanner and it should come undone.
Good luck!
Try and clean the solid pipe up as well so the union will unscrew. I also prefer to use a proper brake flare spanner, these grip better on all sides rather than just flats with an open ended spanner.
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Old Apr 14th, 2018, 18:40   #10
Ian21401
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Default Found this when I did mine.

I'll try to describe it as I wrote it up in my log.
The flexi pipe and the rigid pipe join at a substantial steel bracket on the inner wing panel. The hexagonal end of the flexi (14 mms.) positively locates into a hexagonal hole on the bracket and is retained by a spring clip below the bracket. This clip is itself retained by the male union on the rigid pipe. (11 mms. ) Once the rigid pipe union has been loosened it should be possible to remove the spring clip and then the flexi pipe from the bracket. As suggesterd by kelvinp clean up the rigid pipe as much as possible to allow the union to turn and move along the pipe. I doused the whole lot with plusgas and invested in a set of brake flare spanners which kelvinp also suggests. Some patience and care should then work.
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