• Hello Guest, we are proud to now have our Wiki online that is completely compiled and written by our members. Feel free to browse our Jeep-CJ Wiki or click on any orange keyword when looking at posts in the forum.

Brakes 1985 CJ7 New Master Cylinder??

Brakes 1985 CJ7 New Master Cylinder??

markwiley2121

Jeeper
Posts
23
Thanks
0
Location
Avon Lake, OH
Vehicle(s)
'77 CJ5
New to me 1985 CJ7 . I recently changed the rear drum brakes, including the wheel cylinders. No apparent brake line leaking. I replaced the brake fluid, and bleed all four brakes (multiple times now). When I took it for a test drive, the brakes responded ok, however I could not lock them up. Also, when stopped and applying moderate pressure the brake pedal slowly went to the floor. When I let up, it returned fine. If I pump it a few times, or push hard suddenly, the pedal stopped halfway down, then slowly sank to the floor. With no leaks, new brake fluid, all bled well, it has to be the master cylinder right? Any other options?
 
Try bleeding fronts first, then rears, then fronts again.
 
Did you bleed the MC, before attaching the lines?
Are you SURE you have the correct MC?
Why did you replace the MC?
 
I didn't replace the MC, I'm wondering if it's bad though. I didn't replace the lines either, they look good with no leaks. I just replaced the drum brakes and the wheel cylinders. I also bleed them twice, once I did it rear passenger, rear driver, front passenger, front driver. Then after a test drive I did rear passenger, front passenger, rear passenger, then the same on the driver side, I read that pattern somewhere before. The second time, no air bubbles came out at all.
 
Replace the MC. Sounds like the internal separator seal is leaking.
 

Jeep-CJ Donation Drive

Help support Jeep-CJ.com by making a contribution.

Help support Jeep-CJ.com by making a contribution.
Goal
$200.00
Earned
$0.00
This donation drive ends in
0 hours, 0 minutes, 0 seconds
  0.0%
Back
Top Bottom