Rear brakes won't bleed - Chevelle Tech
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post #1 of 15 (permalink) Old Oct 13th, 15, 12:33 PM Thread Starter
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dale
 
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Rear brakes won't bleed

OK guys I have a 1966 chevelle. It has all drums ATM. I upgraded to a duel master cylinder. I bought a new distribution block. I got it installed and plumbed yesterday. I did bench bleed the master. I can bleed the front but not the rear. I get nothing out of the rear. I've looked for leaks and triple check all connections. I did not replace to hard lines. Any ideas? Thanks
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post #2 of 15 (permalink) Old Oct 13th, 15, 12:58 PM
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Re: Rear brakes won't bleed



Is your distribution block for a drum/drum system? Did the spool shift while you were bleeding the brakes?

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post #3 of 15 (permalink) Old Oct 13th, 15, 1:07 PM
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Re: Rear brakes won't bleed

On the distribution block is there a place for a wire to hook up. If so you may have to reset the valve that is in the distribution block. With the bleeders closed push the pedal down hard with your hand and listen for a pop. If you hear the pop open up the rear bleeders and try a gravity feed. If that doesn't seem to work bleed one side at a time the normal manual way. You could have a bad rubber line on top of the rear end too.
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post #4 of 15 (permalink) Old Oct 13th, 15, 1:23 PM Thread Starter
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I bought the one from opgi that does not have the wire hook up.
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post #5 of 15 (permalink) Old Oct 13th, 15, 1:28 PM
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Re: Rear brakes won't bleed

When ever I see this issue it requires that the rear of the master needs to be bench bled again, making sure to get all the air out and that's it's pumping plenty of fluid as you depress the plunger.

Plug the holes once you are done then install the master onto to the car and use a brake man to push the pedal as you bleed the brakes as gravity feed usually does not work.

It's best to loosen the bleeder screw as the brakes are being depressed and tighten as the pedal is released. Use a clear hose going from the bleeder into a jar of brake fluid so you can visually see the last of the bubbles coming out.

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post #6 of 15 (permalink) Old Oct 13th, 15, 2:54 PM
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Re: Rear brakes won't bleed

On my 69, I could not get the rears to bleed after switching to front discs (from drums all around). I eventually figured out that the short rubber brake line atop the differential housing had deteriorated over the years to the point that it was completely clogged. A quick trip to NAPA for a new hose and I was back in business

If that flex hose is original to your car, it's 50 years old. Probably a good idea to replace even if it isn't causing your problem. Also, just FYI, I've heard many folks chime in that they had the same problem - deteriorated flex hose over the differential.

Good luck! Hope you get it fixed soon.

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post #7 of 15 (permalink) Old Oct 13th, 15, 2:57 PM
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Re: Rear brakes won't bleed

There is some people who claim to have to get the rear of the car up higher to aid in bleeding the rear brakes.

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post #8 of 15 (permalink) Old Oct 13th, 15, 4:47 PM
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Re: Rear brakes won't bleed

And how old are the rear wheel cylinders? If they are old, they are probably full of muck.

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post #9 of 15 (permalink) Old Oct 13th, 15, 6:44 PM
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Re: Rear brakes won't bleed

If the master got stroked to full travel when bleeding the master it can invert a cup and block fluid travel. Look for a geyser in the center of the fluid reservoirs as someone pumps the brakes. Try stroking the pedal but avoid pushing it all the way to the floor until you have good fluid flow to the rear. If you have bleeders on the master, make sure they are closed off and tight. Seen one loose once and it prevented the rears from working.

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post #10 of 15 (permalink) Old Oct 13th, 15, 8:02 PM Thread Starter
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Thanks for all the great info guys! I will try it again tomorrow. Going to pick up a new center line and new wheel cylinders for the rear tomorrow. They need to be replaced anyway! Lol
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post #11 of 15 (permalink) Old Oct 15th, 15, 1:54 AM Thread Starter
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Just a update.

I got the center line changed tonight. Before I put the new one on I pumped the brakes a few times and fluid shot out of the hard line so it looks like that was the problem! I will be putting on the new wheel cylinders tomorrow morning. I will check back in after that so wish me more luck!
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post #12 of 15 (permalink) Old Oct 15th, 15, 11:47 AM
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Re: Rear brakes won't bleed

Quote:
Originally Posted by Daleo View Post
Just a update.

I got the center line changed tonight. Before I put the new one on I pumped the brakes a few times and fluid shot out of the hard line so it looks like that was the problem!
Glad you got it figured out. I was stumped for a day or two on mine. I finally pulled that flex hose off, and couldn't even blow compressed air through it. I cut it in half with side cutters, and it was just amazing how deteriorated/gunked up it was inside.

Good luck the rest of the way!

Mike

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post #13 of 15 (permalink) Old Oct 15th, 15, 3:20 PM
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Re: Rear brakes won't bleed

A long time ago, I had a Rt. Frt. on my 70 SS hanging up. Changed the Cal. SAME hang up , Change the short rubber line,,, All is now ..OK ! The short rubber line was comming apart (inside) at the crimp and blocking the return of fluid. It acted like a check valve, Fluid into the Caliper and would not return.
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post #14 of 15 (permalink) Old Oct 17th, 15, 7:45 PM Thread Starter
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Got the new wheel cylinders on today and bleed. Thanks again guys for all the help!
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post #15 of 15 (permalink) Old Oct 20th, 15, 2:29 PM
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Re: Rear brakes won't bleed

Coolness!

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