Rear brake drums lock up after driving - Team Camaro Tech
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post #1 of 8 (permalink) Old Jul 6th, 10, 10:34 AM Thread Starter
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Rear brake drums lock up after driving

My car has been restored for 12 years with all new brake parts. Emergency brake works as it should.

After driving a few miles the rear drums hold the car like the emergency brake is on. Wheels get very hot. After everything cools the wheels turn freely.

Whats the problem? Wheel cylinders, proportion valve?

Lee (in Louisville, Ky)

Second owner 69 SS Camaro 350 A/C Stick

I specialize in Muncie 4 speeds. Rebuilding tranys for 20 years with over 50 Muncies to select from. If your looking for a certian date code I should be able to help.
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post #2 of 8 (permalink) Old Jul 6th, 10, 10:51 AM
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Re: Rear brake drums lock up after driving

First possibility: Rear flex line is collapsed. Also check wheel cylinders while you're at it. Make sure fronts are operating correctly also. Vehicles don't welcome extended idle time.

Last edited by Sauron67MM; Jul 6th, 10 at 11:48 AM. Reason: clarification
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post #3 of 8 (permalink) Old Jul 6th, 10, 11:08 AM
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Re: Rear brake drums lock up after driving

your rear wheel cylinders are bad..the rear brake hose wont collaspe and open up again.

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if you have an all original 1st gen camaro 67-69 click on the link below and enjoy the veiw and post your up!!
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post #4 of 8 (permalink) Old Jul 6th, 10, 11:26 AM
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Re: Rear brake drums lock up after driving

Quote:
Originally Posted by SPARKY69 View Post
your rear wheel cylinders are bad..the rear brake hose wont collaspe and open up again.
No it won't open up again once it's failed to any degree, But partial or total constriction will allow the system to hold pressure, heating up the brakes until cooling allows them to release. That is a symptom the OP stated.
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post #5 of 8 (permalink) Old Jul 6th, 10, 05:19 PM Thread Starter
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Re: Rear brake drums lock up after driving

Thanks guys! I'll try wheel cylinders.

Lee (in Louisville, Ky)

Second owner 69 SS Camaro 350 A/C Stick

I specialize in Muncie 4 speeds. Rebuilding tranys for 20 years with over 50 Muncies to select from. If your looking for a certian date code I should be able to help.
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post #6 of 8 (permalink) Old Jul 9th, 10, 10:58 AM
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Re: Rear brake drums lock up after driving

Lee, I would go ahead and replace the hose too while you are under there and you have to bleed everything anyway. Cheap part and easy to replace, and if the wheel cylinders are not the problem, you will be beating yourself upside the head.

I had front brake hoses collapsing on that junky old blue 67 that I used to own many years ago, and it too would release pressure after awhile. You can't tell by looking at the rubber hoses that there is anything wrong with them.

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post #7 of 8 (permalink) Old Jul 11th, 10, 10:14 AM Thread Starter
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Re: Rear brake drums lock up after driving

For everyone's future reference to this problem I posted about:

My wheel cylinders were fine. I replaced my rear rubber brake line (old one was callapsed) and now my brakes work fine.

Lee (in Louisville, Ky)

Second owner 69 SS Camaro 350 A/C Stick

I specialize in Muncie 4 speeds. Rebuilding tranys for 20 years with over 50 Muncies to select from. If your looking for a certian date code I should be able to help.
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post #8 of 8 (permalink) Old Jul 11th, 10, 10:39 AM
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Re: Rear brake drums lock up after driving

Quote:
Originally Posted by mrmuncie View Post
For everyone's future reference to this problem I posted about:

My wheel cylinders were fine. I replaced my rear rubber brake line (old one was callapsed) and now my brakes work fine.
Just as I suspected. Now replace the front flex lines. Internal failure is a common problem and often the last thing checked.
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