Need brake help, Can,t bleed fromt
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 754
Likes: 37
From: Connelly Springs NC
Need brake help, Can,t bleed fromt
I just purchased a 1970 Vette about 2 months ago. When I got the car home the next day I noticed a puddle of brake fluid under one wheel. I decided to do the entire brake system. I had the master cylender rebuilt and had the calipers rebuilt with o-ring seals with SS sleaves, new hoses and new front lines. I just finished putting it all together and I am in the process of bleeding the brakes. The MC is bleed and I was able to use a vacuum bleeder on the rear brakes, but I can't get any flow out of either front caliper???
Is is possible that the pressure distribution block/swtich is stuck? How do I tell and how can I get it moved back? Is there anything else that I should check?
Is is possible that the pressure distribution block/swtich is stuck? How do I tell and how can I get it moved back? Is there anything else that I should check?
Le Mans Master
Joined: Oct 2004
Posts: 5,269
Likes: 54
From: Orlando Florida
St. Jude Donor '05
Since the front caliper was leaking you can say for sure that you had flow to the front calipers before the re-build. Did you do anything to the distribution block/valve ??
What happens when you pump the brake pedal ? Any flow to the front ?
What happens when you pump the brake pedal ? Any flow to the front ?
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 754
Likes: 37
From: Connelly Springs NC
No flow to front
I had my wife help me. The usual pump & hold, then I open the bleeder and close. We then repeated several times. Nothing out the front and no change in the pedal.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by Greg G
I bench bleed the MC, no air in MC. I pulled a vacuum on the bleeder on both front calipers and got no flow.
Gregg i have had lots of cars and used the Mity Vac on all of them to bleed the brakes....on the vettes they just don't work well....i have heard people say the the seals on the pistons will suck in air instead of pull brake fluid through...try it all over again the old fashion way or use a pressure bleeder... I did and it fixed my issues it almost drove me nuts (using the vacuum bleeder)
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Instructor
Joined: Jun 2004
Posts: 220
Likes: 0
Had the same issue with my 69. The press diff valve is spring loaded. If it moved you need to equalize the pressure between front and rear systems, opening the bleeders should do this. If you bleed using the brake pedal, use only enough force to get the pedal to move ,very slowly and very gently. Be patient and tap the calipers with a mallet while you are bleeding. Remember the rear calipers have more than 1 bleeder. You can also open all the bleeders and let it gravity bleed. I prefer the pedal bleed method.
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 754
Likes: 37
From: Connelly Springs NC
Got then bleed, but have a bad fitting on MC
Thanks everyone for all the suggestions. My calipers have o-rings with no springs. I was concerned that maybe the pistonds were too far back and blocking off the flow, so I usede a little air from the bleeder to push the pistons out. I then rebleed the MC on the front and then used the manual pupm and hold until I got fluid. It finally worked.
Now I found a leak from fitting on the front MC to the dist block. Tried to tighten but did not want to strip it. I do not wnat to take it apart again to check the flare so I will order a new line and when it cones in I will try again
Again thanks everyone.
Now I found a leak from fitting on the front MC to the dist block. Tried to tighten but did not want to strip it. I do not wnat to take it apart again to check the flare so I will order a new line and when it cones in I will try again
Again thanks everyone.