New Brake Bleeding

Oklacarcollecto said

Is the one ton wheel cylinders using all the fluid capicity of the master cylinder because of their large bore? You master cylinder may not be able to push enough brake fluid to operate the larger id ehrrl cylinders. The bore on one ton master cylinders is larger to match the other larger cylinders.

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That right there is the answer.

That being said, I've also seen MANY bad master cylinders (new), right out of the box. On my Dodge D50 I must have tried 4 or 5 master cylinders in a row (new) and each one the pedal would travel to the floor.

My front brakes barely worked, if at all. And the rear brakes were only slightly better. Tried gravity bleeding, vacuum bleeding, etc. Finally I swapped the Master Cylinder off of a Parts Truck (the used m/c was about 2 years old, from Napa) and within a couple minutes I had a full brake pedal.

Sent the new one back to Advance and got my money back. Ironically enough, every time I've seen a defective Master Cylinder or Clutch Cylinder, they had been purchased at Advance or Autozone :wack: