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Old 07-27-2018, 08:39 AM   #1
Hotcorner
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Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 890
Vanishing Brake Fluid

So the rear half of the master cylinder slowly loses fluid until empty. I suspected that the front wheel cylinders might be leaking, but I pulled back the rubber and they were dry inside. I see no evidence of leakage inside the drum. I have looked and can’t seem to find a leaking line anywhere.

It’s a 69 K25 with PB and drums on all 4 corners.

I’m stumped. Ideas? Pump the fire out of the pedal and keep looking, I guess.
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1969 GMC K25
2007 Chevy 2500HD Classic Duramax
1999 Tahoe 2DR 4WD Base Model 5.7l
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