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68gmsee · 10-09-2012, 07:20 PM

Yes, replace the master cylinder. Replace all three rubber lines if they are the original. They may look okay on the outside but the rubber will swell on the inside and prevent the fluid from passing through or restricts it. Not worth the trouble later on.

While you're at it, you may as well do a complete brake system rebuild. I spent a little over $200 but it was well worth the effort. All new shoes, springs kits, wheel brake cylinders, turned the drums and replaced all three rubber brake lines.

10-09-2012, 07:20 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Brake Problems - Won't bleed, leaking out of master Yes, replace the master cylinder. Replace all three rubber lines if they are the original. They may look okay on the outside but the rubber will swell on the inside and prevent the fluid from passing through or restricts it. Not worth the trouble later on. While you're at it, you may as well do a complete brake system rebuild. I spent a little over $200 but it was well worth the effort. All new shoes, springs kits, wheel brake cylinders, turned the drums and replaced all three rubber brake lines. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...