I just finished my disc brake conversion and installed all new brake lines front to back. From what I've read in my research, I have to gravity feed the fluid before I can bleed the corners.

Can someone help me with how to perform this process?

Thanks,
Jim

Not sure what you mean by gravity feeding the fluid. I replaced some of the lines & the mc on my 69 & just bench bled the mc & used a vac pump on each wheel cyl. I also used speed bleeders on the wheel cyls, as it's a little less of a monkey circus than trying to open & close the bleeders each time if someone is pushing the brake pedal to bleed the system.
Mike

your best bet is to get a buddy, offer him a couple beers, maybe more???? and do the manual procedure starting at the master cylinder. Crack both of the fittings open, pedal down close the line fittings at the master and repeat till all bubbles are gone. Then go to all the brake bleeders and do the same. The answer to your ? is yes you could gravity bleed the system by just opening all the bleeders, grab a beer or two and by the time you finish them im asuming you should get clear fluid out of the bleeders. DONT LET THE MASTER GO DRY!! and it somtimes doesnt allways work, gravity bleeding that is. Somtimes you may get some air trapped. Thats why i say to get a buddy.

I guess that's what I was curious about. Will the fluid just drain through the m/c and the combination valve on it's own or do I have to do something to the pedal or the "button" on the combination valve for gravity to take the fluid to the wheels?


Jim

nop, gravity should do it all, thats what i end up doing if i cant get a helper, but it will take time!!!!

Ok, I got the front ones to work. But, there is no fluid traveling to the back lines. When I press the pedal, I don't even see the fluid moving in the m/c.

Is it having trouble getting through the combo valve?

Jim

I just got the brand new brakes going on my 69. The only parts that were used, were the sprindles, backing plates, and prop valve and dist block.

I filled with silicone brake fluid, bench bled the master cylinder, then cracked the bleeder screws on all 4 corners and left the cap off the master cylinder. I then got some clear tubing, and 4 empty water bottles. I ran the tubing over the bleeders, and into the CLEAN bottles. One line and one bottle per wheel. After the bleeders were open, and the cap was off the master.... then came the hard part. I went inside and watched television for about 4 hours. Came back and had pretty solid flow in the tubes coming off the front bleeders. The back lines were still full of air. I closed the front bleeders, topped off the master cylinder with fresh brake fluid and went inside to watch more television. 2 hours later I came back out and the fluid had made it to the back lines. I then closed off the remaining 2 bleeder valves, topped off the master cylinder with fluid yet again, and fastened the cap on top of the master. I then had a buddy come over and pump the brake pedal 10 times, and then I would crack the bleeder. Repeat the process until there is no air coming out of the bleeders. Start with the pass side back wheel, the driver side back wheel, next is pass side front wheel, and lastly do the front driver side wheel. Continue this process of pumping and "cracking" the bleeder valve until you have no air, and a super firm pedal. YOu may have to "go around" the car 3-4-5 times. It will come in time tho. Be patient and it will work out great!

Best of luck.

Shahreyar

That's exactly what I did. Worked well.

Tim.

thats the trick! but make sure you crack open the master and let fluid come out of the fittings that will speed up the process and may help some trapped air.

Well, here is what I have discovered...

I originally let the car sit for almost eight hours as described above and the only fluid coming out was at the front two wheels. nothing in the rear. So, I went up to Sears and got a MigtyVac for $25. WOW! Everybody should have one of these in thier garage! I had my wife stand next to the m/c with a bottle of fluid while I went to each corner with the vac pump. The whole thing took 15 minutes!!! The only thing I am ****ed about is that I didn't buy one of these 10 years ago!!

Thanks for all your replys, guys.