78 brake problems
Thread Starter
3rd Gear
Joined: Aug 2013
Posts: 3
Likes: 0
78 brake problems
Hey guys, new here and kinda new to corvettes and seem to have a problem..
I bought my 78 as a non runner and have basically given it a full body on restoration, last weekend new motor (350) finally turned over for the very first time and i was very happy as the car was basically 'finished' however a new problem has arose..
Brake pedal feels good when the engine is off, one pump then gets rock hard, however when i start the motor,the brake pedal has no resistance and goes straight to the floor when i press it. I have vacuum going to the booster and booster seems to be holding vacuum fine.(valve also fine) Im very sure i have got all the air out of the system. Have gravity bled, 2man bled about 10 times and pressure bled. (gone thru alpt of brake fluid lol, but mc never sucked in air
)
Have replaced master cylinder and have converted all 4 callipers to o-ring with ss sleeves. None are leaking, all lines are dry really not sure where to go from here, could it still be the booster?
Thanks.
I bought my 78 as a non runner and have basically given it a full body on restoration, last weekend new motor (350) finally turned over for the very first time and i was very happy as the car was basically 'finished' however a new problem has arose..
Brake pedal feels good when the engine is off, one pump then gets rock hard, however when i start the motor,the brake pedal has no resistance and goes straight to the floor when i press it. I have vacuum going to the booster and booster seems to be holding vacuum fine.(valve also fine) Im very sure i have got all the air out of the system. Have gravity bled, 2man bled about 10 times and pressure bled. (gone thru alpt of brake fluid lol, but mc never sucked in air
)
Have replaced master cylinder and have converted all 4 callipers to o-ring with ss sleeves. None are leaking, all lines are dry really not sure where to go from here, could it still be the booster?
Thanks.
Thread Starter
3rd Gear
Joined: Aug 2013
Posts: 3
Likes: 0
Thanks for the replies. No i didnt bench bleed it. Im sure all the air is out of it tho, when i depress the pedal no air bubbles come out of the MC. going to do a full blees again today and see how that goes...
More bleeding resolved the issue.
