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Unread 06-12-2013, 04:29 PM   #1
larock
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1983 CJ7 
 
Join Date: Feb 2013
Posts: 115
Brake problems

I have a 1983 jeep cj7(disc front brakes/drum rear), I have just replaced wheel cylinders, master cylinder, and rear brake shoes. We have bled the system twice, first time a fair amount of air came out and the second time absolutely none. The brakes are now very spongy and go basically all the way down to the floor, also when the brakes are pressed down the brake light on the dash comes on. There are no readily apparent leaks at any of the lines or joints. What could this be?

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Unread 06-12-2013, 06:58 PM   #2
Jeepin72
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2005 TJ Wrangler 
 
Join Date: Apr 2009
Location: "The Kingdom", Colorado
Posts: 1,501
Did you bench blead the MC. That may pushing a large amount of air into the lines it wasn't bled.

Check the push rod (if a CJ has one). I know when I did a recent axle swap and toyed with a different MC the push rod was crucial. I assume it was just a new part and not a change, but it could be a bit off.
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Unread 06-12-2013, 08:43 PM   #3
larock
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1983 CJ7 
 
Join Date: Feb 2013
Posts: 115
Quote:
Originally Posted by Jeepin72
Did you bench blead the MC. That may pushing a large amount of air into the lines it wasn't bled.

Check the push rod (if a CJ has one). I know when I did a recent axle swap and toyed with a different MC the push rod was crucial. I assume it was just a new part and not a change, but it could be a bit off.
We did not bench bleed but we did the one person on the breaks and one person under the car style and we did that twice
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Unread 06-12-2013, 09:07 PM   #4
Jeepin72
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2005 TJ Wrangler 
 
Join Date: Apr 2009
Location: "The Kingdom", Colorado
Posts: 1,501
I can tell you that when I did my MC swap I had to push a whole lot of fluid to get the system bled. So many repetitions I didn't count. I bench bled the MC. But I was working with a lot of new lines so that accounts for a lot my experience. But if the MC had air, you will need to push that from the beginning spot of the system to the end at the bleeder screw. It may take a long time.
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