Forum Home Forum Home > CJ-2A Discussion Area > Tech Questions and Answers
  New Posts New Posts RSS Feed - Brake bleed process
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Brake bleed process

 Post Reply Post Reply
Author
Message
cj2a1946jeep View Drop Down
Member
Member


Joined: 19 July 2021
Location: WI
Status: Offline
Points: 9
Post Options Post Options   Thanks (0) Thanks(0)   Quote cj2a1946jeep Quote  Post ReplyReply Direct Link To This Post Topic: Brake bleed process
    Posted: 14 Sep. 2021 at 11:52pm
I just installed a complete brake system including all lines, MC, y sections, flex hose and wheel cylinders. It took some work but it’s all in now with no leaks or drips I can see. I was able to bleed the brakes. During that process I did find one small leak. I tightened the fitting and it fixed the issue. I decided to fill the MC fluid, topped it off and tried to bleed again starting at the passenger rear.  I have a hard pedal but can’t move fluid through the bleeders for some reason.  When I spin the wheels while jacked up and have someone press the pedal they seem to work fine at all four wheels.  

Some common questions I can answer. I did not bench bleed the MC.  My method of bleeding is an old water bottle with brake fluid attached to a hose connecting to the bleeder.  The hose in the bottle is below the fluid level. I drilled a small hole for the air to escape in the cap.  This system has worked for me in the past. 

Like I said pedal is pretty firm and the pads are moving stopping the drum so fluid must be flowing.  I have not taken it for a test drive yet with higher speeds and forces. Any ideas as to why I can’t move fluid through any of the bleeders?  I would assume if it was air the pedal would be softer.  For reference I have been able to bleed all four wheels. It seems like after fixing the last leak something changed.  Trying to see what else I could be missing… I am sure not bench bleeding set me back but I have moved a lot of fluid through.
Back to Top
Joe DeYoung View Drop Down
Member
Member
Avatar
Sponsor Member x 2

Joined: 20 July 2005
Location: Madison WI
Status: Offline
Points: 3102
Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe DeYoung Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 44 minutes ago at 8:14am
Have you removed the bleeder screws to see if the passages inside them are open? Will fluid exit the bleeder screw hole without a screw in them?
Joe DeYoung
to many jeeps, parts, and accessories to list here, but apparently enough to keep me in trouble with my wife.





Back to Top
SE Kansas 46 CJ-2A View Drop Down
Member
Member
Avatar
Sponsor Member x 3

Joined: 22 Jan. 2016
Location: S.E. Kansas
Status: Offline
Points: 2446
Post Options Post Options   Thanks (0) Thanks(0)   Quote SE Kansas 46 CJ-2A Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 7 minutes ago at 8:51am
Check your brake free pedal. there should be a small amount of free pedal before the brakes actually apply. If you don't have this the master cylinder won't allow the brakes to release.
46 CJ-2A #64462 "Ol' Red" (purchased April 1969)

U.S. Coast Guard Chief Petty Officer (ret.)
U.S. Army Vietnam veteran and damned proud of it.



Back to Top
cj2a1946jeep View Drop Down
Member
Member


Joined: 19 July 2021
Location: WI
Status: Offline
Points: 9
Post Options Post Options   Thanks (0) Thanks(0)   Quote cj2a1946jeep Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 2 minutes ago at 8:56am
I have not taken them fully out.  I get some fluid through into my hose set up. Just not a constant flow where it would fill the bottle and hose setup. 

You can feel a change in the pedal when the bleeder is open.  I have a feeling it’s a pressure thing with the hose / bottle set up.  It might be sucking air back in each pump.  I might try the old fashion way opening pressing pedal and closing with the pedal down. 
Back to Top
Joe DeYoung View Drop Down
Member
Member
Avatar
Sponsor Member x 2

Joined: 20 July 2005
Location: Madison WI
Status: Offline
Points: 3102
Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe DeYoung Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 51 minutes ago at 9:07am
Sounds like your bleeders are working just fine. You will only get a significant amount of fluid coming out the open bleeder while the master cylinder is displacing fluid.
Joe DeYoung
to many jeeps, parts, and accessories to list here, but apparently enough to keep me in trouble with my wife.





Back to Top
JohnB View Drop Down
Member
Member
Avatar
Sponsor Member

Joined: 01 June 2014
Location: Saint Louis
Status: Offline
Points: 270
Post Options Post Options   Thanks (0) Thanks(0)   Quote JohnB Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 3 minutes ago at 9:55am
Adding on to SE, you also need enough free play in your brake pedal so that the piston in the MC can fully reset every time you press on the pedal. 
Back to Top
cj2a1946jeep View Drop Down
Member
Member


Joined: 19 July 2021
Location: WI
Status: Offline
Points: 9
Post Options Post Options   Thanks (0) Thanks(0)   Quote cj2a1946jeep Quote  Post ReplyReply Direct Link To This Post Posted: 19 hours 19 minutes ago at 10:39am
Would that be push rod adjustment then? 
Back to Top
SE Kansas 46 CJ-2A View Drop Down
Member
Member
Avatar
Sponsor Member x 3

Joined: 22 Jan. 2016
Location: S.E. Kansas
Status: Offline
Points: 2446
Post Options Post Options   Thanks (0) Thanks(0)   Quote SE Kansas 46 CJ-2A Quote  Post ReplyReply Direct Link To This Post Posted: 19 hours 10 minutes ago at 10:48am
Originally posted by cj2a1946jeep cj2a1946jeep wrote:

Would that be push rod adjustment then? 
Yes.
46 CJ-2A #64462 "Ol' Red" (purchased April 1969)

U.S. Coast Guard Chief Petty Officer (ret.)
U.S. Army Vietnam veteran and damned proud of it.



Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.04
Copyright ©2001-2019 Web Wiz Ltd.