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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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I would suggest changing the whole master cylinder with a quality part or rebuild yours. One sensor is for the cruise control. That's the one that was catching trucks on fire. I think there is another one for fluid level - but maybe not on ours. A lot of models have that.
Making your own brake lines isn't a huge deal. Most auto supply's will have tubing with premade ends in various lengths that you can bend with a tubing bender or you can get a good flaring tool and make whatever lengths you want. Get stainless lines if you are in a rust prone area.

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