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Help with C5 brakes, maybe Master Cyl?

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Old Jun 15, 2022 | 07:51 PM
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Default Help with C5 brakes. Brake line under car?

I was backing out of the driveway today and the brakes felt a bit odd. Like less pressure but still working. Then the pedal went to the floor. Brakes still working but the pedal was very loose. With the pedal to the floor they only lightly stop the car.

Smoke then started pouring out from under the hood, near the firewall, driver side. The master cylinder doesn't look like it's leaking but the reservoir is empty and the bottom of the headers have some drips..

Suggestions on where to start? It looked like the smoke was coming from brake fluid leaking onto the headers, but again, the master cylinder doesn't look to have any leaks around it. I haven't gotten under the car yet.

edit: 1998

After getting under the car, its leaking brake fluid somewhere underneath bit I cant tell exactly where.

Last edited by charles_b; Jun 17, 2022 at 08:15 AM.
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Old Jun 15, 2022 | 08:15 PM
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It sounds like you blew a brake line or hose. Refill the master cylinder (put the cap back on) and have someone pump the brakes while you look under the hood. Rinse the car really thoroughly when done.
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Old Jun 15, 2022 | 08:37 PM
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Originally Posted by ThomasR
It sounds like you blew a brake line or hose. Refill the master cylinder (put the cap back on) and have someone pump the brakes while you look under the hood. Rinse the car really thoroughly when done.
I'm thinking the same thing. After a closer look, the master cylinder and area around it are dry but there's some sort of liquid on the headers right under the firewall. probably a line..
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Old Jun 16, 2022 | 07:48 AM
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Its leaking down right where the headers meet the cats.. are the brake lines running through there as well? Having a hard time getting that far under it in the garage
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Old Jun 16, 2022 | 08:38 AM
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The master could be leaking into the booster and dripping from there
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Old Jun 16, 2022 | 10:52 AM
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Originally Posted by Old School
The master could be leaking into the booster and dripping from there
How would I diagnose that? take the master off and check for bad seals somewhere?
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Old Jun 16, 2022 | 12:25 PM
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Originally Posted by charles_b
How would I diagnose that? take the master off and check for bad seals somewhere?
This actually happened to my sons Tacoma. It was losing brake fluid, it has to be going somewhere. It was leaking past the plunger on the master into the booster. It was obvious once I removed the master from the booster.
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Old Jun 17, 2022 | 08:14 AM
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I think i found my problem. Fluid is all over everything here. On the walls and surfaces, dripping off the fuel lines (i think those are the braided lines)

Are those small lines the brake lines? If so, i believe the rusted one may be busted..

This is in the trans tunnel above the exhaust pipess

The trans is covered in fluid too...


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Old Jun 17, 2022 | 09:38 AM
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Yep, looks like corroded steel brake lines leaking fluid. You got some work ahead of you.
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