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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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How to undo seized brake-line to hose nuts? Any ideas?Views : 1409 Replies : 25Users Viewing This Thread : |
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Nov 22nd, 2021, 15:57 | #1 |
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How to undo seized brake-line to hose nuts? Any ideas?
Hi all,
I'm at my wits' end with this one! I've had to replace the rear calipers on my 740 estate. All went well until trying to remove the old hoses from the brake lines. The nuts are absolutely solid, having been on there for 32 years. They also appear to be brass and even the use of a proper split-ring brake spanner resulted in turning over the corners. I've since bought a special locking wrench (4LW size - https://www.irwin.com/tools/locking-...cking-wrenches) which is designed to clamp on to the alternate triangular faces of the nut so as to avoid slipping over the corners and it doesn't slip but I still can't shift them. I've tried heating the metal ends of the hoses to try to break any rust seal and tried to get some 'plus gas A' up there (though tricky because of the angle - hose pointing downwards) but to no avail. Even putting a lever between the grips and the 14mm spanner on the hose just ended up trying to twist the bracket. I had a similar problem with one of the O/S/F pipes when replacing calipers there a year or two back, so I had to dismantle back to the master cylinder and take it into my local motor factor who made up a complete new pipe. It wasn't too bad there, as it was the shortest run. However, that's absolutely the final resort on the rear as, with split diagonal circuits, both pipes individually run the entire length of the car and would be a nightmare to remove and replace. Does anyone have any ideas? Ta, David.
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740 GL Est '89 (pre-f’lift, daily 'shed') 740 SE Est '89 (post-f’lift, laid-up) 940 Celebration Est ‘98 2.3 LPT (for 'best') 440 Xi '93 (barely run-in!) |
Nov 22nd, 2021, 16:31 | #2 |
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I know very little about hydraulic lines on cars but would one option be to cut off a section of the hard line, install a fresh union, and extend the flexi to meet it?
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'93MY Volvo 940SE 2l Petrol Manual non-a/c "Valhallarama" |
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Nov 22nd, 2021, 16:49 | #3 | |
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Quote:
I am wondering whether I'll have to cut through the metal section of hose to be able to get some plus gas up from the 'inside' and try to shift it that way ... but it's high risk. Thanks anyway.
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740 GL Est '89 (pre-f’lift, daily 'shed') 740 SE Est '89 (post-f’lift, laid-up) 940 Celebration Est ‘98 2.3 LPT (for 'best') 440 Xi '93 (barely run-in!) |
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Nov 22nd, 2021, 16:58 | #4 |
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Heat and reheat, interspersed with application of penetrant. Also try and tighten the connection, then loosen, sometimes that will break up the corrosion and allow penetrant to enter.
Many swear by a mix of ATF and Acetone as a penetrant, more effective than off the shelf products. |
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Nov 22nd, 2021, 17:03 | #5 | |
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Quote:
Thanks for the thought.
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740 GL Est '89 (pre-f’lift, daily 'shed') 740 SE Est '89 (post-f’lift, laid-up) 940 Celebration Est ‘98 2.3 LPT (for 'best') 440 Xi '93 (barely run-in!) |
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Nov 22nd, 2021, 17:12 | #6 |
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Be very careful when heating brake lines as they can explode in a big way.
It's not good practice to cut lines and join them either.
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Nov 22nd, 2021, 17:16 | #7 | |
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Quote:
Ta. D.
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740 GL Est '89 (pre-f’lift, daily 'shed') 740 SE Est '89 (post-f’lift, laid-up) 940 Celebration Est ‘98 2.3 LPT (for 'best') 440 Xi '93 (barely run-in!) |
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Nov 22nd, 2021, 19:03 | #8 |
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