Trying to figure out brake problem with rear disc upgrade

[Apogee]

Originally Posted by CreepinDeth

Man, I really don't know. LOL

I bled EACH caliper at least 5 times with a vacula, then my hand with a 2nd person (old fashioned way), and then with the 1 man bleeder bottle with help again. I don't see anymore bubbles coming out. So I just ASSUMED there was no air because hell it should have came out by now I thought. If I couldn't get it out that many times, I figured it will never come out so it's GOTTA be clear.

I'm going to bench bleed the master though because while I had it hooked up to the booster , I left it unplugged while I was flaring some new fittings. It's possible air got back in the MC. Thanks for replying to my email too bro. I will try that, then if it's fine, I'll just install the new Raybestos premium 79 new MC I just ordered. My Camaro used the same MC and went like a BREEZE the 1st time around. This one is being a real bitch to me.



BTW what did you mean by "A single master cylinder" ??
The 79 Vette MC has 2 equal size chambers and is 1 1/8".....so you lost me. I'm still kinda new to this so excuse my ignorance.

Wow...I should buy some stock in whatever brand brake fluid you're using.

By single master cylinder, I meant a single tandem master cylinder, one with one bore size and two pistons and outlets so that you have some safety should one circuit fail. The alternative being dual master cylinders like those used in a race pedal setup with a balance beam between the two. These setups allow you to run different bore MC's front and rear, giving you the flexibility to run huge caliper mismatch's should you want to and still getting the bias you want/need.

As for the MC fittings, I'll usually bleed the MC fittings first by cracking them one at a time while under pressure just so I don't have to push those air bubbles all the way through the system, especially if it's already been filled. It also helps if you run your hard lines to the MC slightly uphill so that they hold more fluid prior to installation. The air that I've had difficulty bleeding from the MC at times seems to be tiny bubbles trapped in or around the seals. No amount of moving fluid through the MC seems to remove them without some tapping with a dead-blow hammer to help dislodge them.

Tobin
KORE3