Brake fluid reducing but could not find where was leaking

1998 CHEVROLET LUMINA
214,000 MILES • 3.1L • 6 CYL • FWD • AUTOMATIC
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XJSHEN
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My car is a 1998 Chevrolet Lumina. there was AutoLock light on the dash. I replaced Fuse 16 and fixed the problem. But after I foot on brake pad strongly three times before start engine there was Brake light on the dash board, and the brake does not apply efficiently, brake only slightly work. And that time brake fluid level in muster cylinder was full, but after one day the level is go to bottom surface of tank. After I fill full but once again it gone to bottom.
I found thin brake line rusted line attached to body where was leaking at rear left tire. Is it possible replace the brake pipe line by myself? How
How much cost for the repair?
Thanks!
Steven
Jan 23, 2014 at 10:47 AM
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HMAC300
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you can replace it but make sure to get correct fittings on it. you will have to bend it as well then bleed it. we dont' have costs of stuff like that due to different lengths. check at auto parts.
Jan 24, 2014 at 7:02 AM
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XJSHEN
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Thanks for your comment. I found rear right side brake tube line was rusted and leaking. So, it caused brake fluid reduce to the bottom of muster cylinder. At this case need I replace muster cylinder also? or just need to replace tube line only? I want to do all these work by myself.
Appreciate your comment and help!
Jan 25, 2014 at 9:19 PM
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HMAC300
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fix the brake line, fill the master an dbleed the system.
Jan 26, 2014 at 8:15 AM
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XJSHEN
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Thanks!!!
So do not need to replace muster cylinder?
XJ
Jan 26, 2014 at 11:15 AM
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XJSHEN
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There were two different brake tube lines, thick and thin connected to the rear tire. What is different function? My thin tube was leaking.
Thanks for your instruction!
Jan 26, 2014 at 11:18 AM
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HMAC300
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Fix the brake line that leaks fill the master and bleed the system. How much simpler do you want it?
Jan 26, 2014 at 12:14 PM
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XJSHEN
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Hello!
I replaced leaked brake line after flare, banding and fitting and connected.
should I replace Muster cylinder first, fill brake fluid, then breeding?
Or just fill muster cylinder, fill brake fluid, then breeding?
When brake line leaking overnight, the muster cylinder was empty.
Thanks for your input and instruction.
Steven
Jan 31, 2014 at 3:50 PM
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HMAC300
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fill the master cylinder with brake fluid then bleed the system if the master cylinder leaks after you are done bleeding and fluid goes down after youhave refilled it after bleeding then replace the master cylinder otherwise leave it alone.
Jan 31, 2014 at 5:05 PM
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XJSHEN
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Great!
Thanks a lot!
After fill brake fluid, I foot brake pad several times but there was no pressure on the brake.
I will bleed tomorrow. I only have one Bleeder.
So, I want to go left front - right front- rear left and right rear.
Does it work?
Steven
Jan 31, 2014 at 9:19 PM
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XJSHEN
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I read some one wrote that Brake system bleed sequence on 1998 Chevrolet lumina is:
1. Rear right 2. Front left 3. Rear Left 4. Front right

When I repair brake line, the rear right tire connected was longest. So, bleed rear right should be 1st. If left front bypassed with rear right? if yes, should bleed it for 2nd for time. as so on for the rest.
If you have different view on the issue?
Thanks!
Jan 31, 2014 at 11:27 PM
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HMAC300
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right rear left rear right front left front. this may have to be professionally bled though. I have no further suggestions. if you run into problems look on our site on how to bleed brakes. under how to repair.
Feb 1, 2014 at 6:21 AM