Anti-lock check warning light on...Why??? - JeepForum.com
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Unread 05-24-2013, 10:49 PM   #1
wrangleryj89jp
Registered User
1989 YJ Wrangler 
 
Join Date: May 2013
Location: Burnsville, Minnesota
Posts: 52
Anti-lock check warning light on...Why???

I have an 89 yj, and the anti lock check warnign light is on ONLY when i push brake pedal in, and when it starts, then it goes off... I get very little braking power. It is very hard to stop the car.. Actually, i have to slam on the brakes to even stop slowly.

I know the brakes used to squeak in the fall. The car has been parked all winter. They only squeaked for a short time, and then stopped, so I let it go.

Is this a sign I need new brakes?

ALSO, every time I brake, with the power brake booster vacuum hose connected, the rpms will go up about 100 - 200 rpms, but if the vacuum hose from the intake to the booster is not connected, the rpms will stay the same.

Is this nromal?

One other thing. The anti lock check light goes on every time i push the brake pedal in... but when i let it go, the anti lock check light will go off...

What problems am i having? Anyone have any input?

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Unread 05-25-2013, 01:00 AM   #2
Joe Dillard
Electric Chair Operator
1991 YJ Wrangler 
 
Join Date: May 2004
Location: King George, VA
Posts: 12,415
What did you observe when you checked the fluid level in the master cylinder?
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Unread 05-25-2013, 05:48 AM   #3
wrangleryj89jp
Registered User
1989 YJ Wrangler 
 
Join Date: May 2013
Location: Burnsville, Minnesota
Posts: 52
The fluid level in the master cylinder is full... Any other solutions to this problem anyone might have?
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Unread 05-25-2013, 09:41 AM   #4
XJ93
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1993 ZJ 
 
Join Date: Apr 2009
Location: Michigan
Posts: 797
My brakes acted that way when I changed the hoses, bled it out and worked fine and no light after that.
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Unread 05-27-2013, 02:05 AM   #5
wrangleryj89jp
Registered User
1989 YJ Wrangler 
 
Join Date: May 2013
Location: Burnsville, Minnesota
Posts: 52
I have found out I am in need of a new BRAKE BOOSTER. I purchased a REMAN online that came with the master cylinder REMAN as well, just in case. I will be installing it within a week, when it comes in the mail.

I recently have restored my YJ from a car fire, and it so happened that the BRAKE BOOSTER diaphragm, or seals inside has took a major beating, and will not seal properly, let alone work. This is most likely what caused the problem to begin with.

I will post my findings and leave you all updated ASAP.

Thanks
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Unread 06-14-2013, 12:20 PM   #6
wrangleryj89jp
Registered User
1989 YJ Wrangler 
 
Join Date: May 2013
Location: Burnsville, Minnesota
Posts: 52
Sorry for the late update. I totally forgot about this post...

I installed the new brake booster, and kept the old master cylinder because I couldnt get the bolts off. After installing power brake booster I finally have working, reliable brakes!

As always, your help is very appreciated. Thanks.
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