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Brake fluid leak

1515 Views 7 Replies 5 Participants Last post by  Steve83
So last night I lost about 90% of my breaking power. I popped the hood and noticed I was almost completely out of fluid and it was spewing out all over the leaf springs below. I filled it back up to get me to my destination and monitored it very closely. It has since gone down some, so there is a slow leak somewhere. I pulled the driver sides wheel well liner and inspected the lines that run on top of the frame and they all look good. From underneath, I reached up to the bottom of the fluid reservoir and my hand got coated in clear fluid so I think the leak is coming from there. Couple questions. There is a sensor plug on the bottom of the reservoir...what is that even for? And secondly, do I just replace the reservoir or the whole master cylinder? Truck has 303k miles and I've never touched the master cylinder and I don't believe the previous owner did either. Thanks!
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If you can't tell what's leaking, post a BUNCH of pics, and maybe we can help you ID it. This caption contains a link to a free image hosting site:

The reservoir level sensor can't cause a leak - it's magnetic, so it doesn't penetrate the reservoir. The reservoir grommets are extremely tight, and the fluid agains them is at very low pressure, so they wouldn't be "spewing".

The SCCDS (cruise) doesn't leak to the outside; it leaks through its connector & into the wiring harness - into the actual strands of wire going to the cruise servo.

This has to be between the MC & slaves.
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Yep - just buy a premade straight line the right length, and bend it to fit.
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