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Unread 10-20-2013, 06:26 AM   #1
kleedian
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1984 CJ7 
 
Join Date: Sep 2013
Location: fort worth, texas
Posts: 19
77 chief brake problem

Went to help a friend work on his 77 yesterday, he purchased it a few weeks, it has been sitting for 15 or so years.
We have added a spring over axle lift, rebuilt the motor, replaced the rear brake drums and have done a complete brake job, he finally got in his exteneded brakes lines yesterday so we decided to hook them up and bleed the brakes
Filled the master cylinder, he pumped the brakes i went to passenger rear to bleed, no air no fluid coming out, checked the fluid level it dropped a bit. topped it off and tried again, same result EXCEPT he noticed a grinding sound as he depressed the brake pedal and fluid was pumping out of the master cylinder..

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Unread 10-22-2013, 04:14 PM   #2
kleedian
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1984 CJ7 
 
Join Date: Sep 2013
Location: fort worth, texas
Posts: 19
77 chief brake problem

so do you guys think its the master cylinder or the brake assist or both?
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Unread 10-23-2013, 04:59 AM   #3
jeepdaddy2000
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1971 CJ5 
 
Join Date: Jan 2002
Location: Eagle Point Oregon
Posts: 6,116
Might try bleeding them again.
Try cracking the lines at the MC and bleeding it first. This will entail blocking the outlets with your fingers to keep it from sucking air back into the MC. You may want to remove it in order to keep fluid from getting all over the paint.
Insure that the bleeders are closed and he gets a bit of pedal before starting the bleeding process.
You can also use gravity to help by cracking a bleeder and keeping an eye on it. When it begins to leak, close it and crack another. This will take time, but can be done concurrently with other repairs. Once your system is charged, bleed normally.
Be sure the lid is on the MC. Fluid spurts are common when pumping brakes.
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