A day after I talk with the rockauto.com representative, I recieve my Wagner 7/8" bore 1978 Chevrolet Malibu manual brake master cylinder in the mail.

See something wrong with this picture? Reservior is on backwards. I will turn it around before i bench bleed it.

Made in the Good Ol' U. S. of A.

7/8" bore master cylinder piston with the pushrod "dimple"

I pushed in the piston with a brake pedal pushrod I had laying around. Travel was a little over an inch.

Weight of 7/8" Manual Brake Master Cylinder
3 lbs 5 1/8 ounce

Weight of Aluminum Step Bore S-10 Master (24mm / 1 1/4" step bore)
2 lbs 8 1/4 ounce

Only a little over a 3/4 of a pound difference.

I need to grind down some of the casting flash and shoot is with some aluminum or black colored paint to keep it looking fresh and not like a peice of rust after about a year.