Fren20

Pulsing and a almost grind when I'm coming to a stop under 5 mph in the brake pedal hub bearings are good 2002 grand cherokee

dave1123

First, your Grand Cherokee is a WJ, not a ZJ. Second, it sounds like you have a warped brake rotor, which is common on WJs. They were the first Grands to have dual piston front brake calipers. Quite often one piston will stick and cause a drag that heats up the rotor when you are driving and causes it to warp. Rotor runout must be held to around .002" to prevent this and the mounting surfaces on the bearing hub must be absolutely clean to obtain this spec.

Fren20

Thank you for your info about my Jeep model also the rotor problem. I read on here about ABS problems so I pulled the fuse and problem went away. Pulled the lines going to the wheels cleaned them up put the fuse back in and no problems.

dave1123

Sometimes problems with the ABS on the front wheels can be fixed by cleaning the rust off the tone rings. Rust tends to dull the sharp edges of the rings that the sensors read. The tone rings look like gears with the teeth cut off on the back of the CV joints.

Once in a while you'll get a rotor that isn't machined quite true and it must be indexed or turned one stud at a time until the runout is as close as possible to zero. In other words, if it's not close, take it off and put it back on after turning it one or more wheel studs and check it again.

I've owned one for 8 years and done just about everything you can think of to fix it. It now has 263K miles on it.

For more info, check out wjjeeps.com

Fren20

The tapping is loudest when the engine is cold gets quieter when it warms up.sounds like the tap is coming from the rear of the motor.

dave1123

what tapping? You didn't mention any tapping.

Fren20

You were helpful with the brake pedal issue.so I figured I would throw this out to see if you had any ideas

dave1123

What are you talking about? I don't have long distance ears.