In most cases on these older GM vehicles it is much easier to replace the lines from the master cylinder all the way to the rear wheels. You should be able to find brake lines that are preferred and have the correct fitting for what you need to do. Compression fittings are a definite No No
Some things to check ahead of time
1. Do all the bleeder screws open? If not you may be replacing wheel cylinders and calipers.
2. Are the brake hoses cracked? If they are might as well replace them at the same time.
3. Are the pads and shoes in good shape. If they are getting thin might as week replace them as well.
4. Do all the brake lines you need to replace come loose from the hoses, cylinders, master cylinder, proportioning valve, etc.
Just about every GM that I get in the shop with rusted brake lines to the rear end up with a $800 +/- bill. 3 hours labor, 20+ feet of line, proportioning valves (later models), fittings, wheel cylinders. And a bleed and flush.
The lines don't have to look pretty they just have to work!
good luck and let us know how it goes.
I’m happy to assist further over the phone at
https://www.6ya.com/expert/jeremy_d728a59f986299fa
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