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Blow By Tube Leak

Elk1111

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My truck is leaking something that has the consistency of brake fluid out of the blow by tube. Any ideas on what this might be. Before inspecting I thought I had blown a break line.
 

doghead

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It's probably brake fluid.

The truck's master cylinder was originally vented into the road draft tube.

There was a WMO to eliminate this.

Your air pack probably needs repair.
 

doghead

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A few minutes searching should find you all you need to know.

Please try searching before posting a thread, you'd be amazed what we have covered in 20 years!
 

Elk1111

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Is there another route for the brake fluid to get there? I have the vent tube from the top of the master cylinder running up in front of my firewall in anticipation of putting a remote reservoir.
 

Elk1111

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Got it. I did overfill the MC a bit, but I will probably just rebuild the air pack for good measure. I’ll add that to the ever growing list of things this truck needs. Some days I gotta keep reminding myself that I do this for fun and it’s a hobby. For Christmas I want more tools and more parts. 😂
 

frank8003

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"Some days I gotta keep reminding myself that I do this for fun and it’s a hobby".
Your hobby can last at least another 50 years and will be very satisfying.
Just think about how much the government paid for your truck and you paid like 15% of that for a forever truck.

Make yourself a brake fluid sightglass/ bleeder/ reservoir and you can watch the level go up and down with brake application and will instantly know if fluid is leaking someplace. And put an LED in the dash somewhere that illuminates with brake pedal application; won't tell you if lamps actually light but that the switch is working.
View attachment master cylinder remote roscommon nn17.pdfIMG_2115.jpgbrake reservoir 1.jpg

When you put "remote reservoir" then do like it says beginning of page two in the PDF and remove the splashplate from inside the MC.
IMG_9202.jpgIMG_9201.jpgIMG_9205.jpgIMG_9203.jpg
 
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