ON MY 77 THE FRONT BOWL IS FOR FRONT REAR BOWL REAR brakes

If it has the correct style master on it both "bowls" will be the same size...the front does usually work the rear brakes, and the rear section supplies the fronts...

  Thanks guys I let you know what I find when dig into it.

Come to think of it, they are both the same size, Joel. I haven't worked on mine in so long I forgot. I've been looking at a lot of others.

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Just to be sure I checked the brake lines on my 77 incase I had something wrond and check my Haynes manual. the front brakes are controled by the front bowl . the line at the master cylynder for front is 3/16th the rear bowl suplies the rear brakes and is a 1/4 in line from master cylender to the perportional valve so they should not be able to be crossed. this is confirmed by the pictures in the hayes manual.  I have scan the pictured and if needed can post them

  My brake mystery just turned into a nightmare from hell! Today was nice so I thought I bleed the brakes. I didn't get that far,when I sat the driver's side down onto the jack stand it went throught the frame.It seams that whoever had the car before me, at one time fiberglassed a rust hole in the frame. They did avery good job of hiding it with the glass and paint repair .I had the car in the shop several times since I have had it and they didn't catch it.I MEAN IT WAS DONE REALLY WELL!I am going to take it to a vette shop next friday and see how much and if it can be fixed right.

Hey Rick,

Man, Rick, you're sure taking a hit lately.  I guess I shouldn't tell you that I'll have mine back tomorrow and mechanically it should be almost as good as new.  Where are you taking it? Hope everything works out for you!

Wow man sorry to hear that. Hope it can be fixed

WOW!! Sorry to hear that. If it's only in one or maybe two spots it can be replaced with segments. I really hate to say it but, if that's a hole from rust-through, chances are your frame needs to be replaced!!! GOOD LUCK.