The brakes pulsate with a feeling like the abs is engaging everytime I stop. It usually starts to pulsate at 5mph, and it doesn't matter if I am in drive or reverse. I think it may have something to do with the vacuum tubes coming off of the abs system but I cannot seem to locate where they plug into. My question is where does the vacuum line connect to the abs system on a 2000 GMC Jimmy V-6.

SOURCE: Front drive, 4 Wheel drive won't engage

Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel

Dar

• 2007 Answers
• Posted on Aug 03, 2009

SOURCE: 1997 GMC Jimmy: power windows, power locks, and

Check the wires that go to your wheels for the ABS. They are probably bare from stones hitting them, and shorting out the system.

Harvey N Tawatao

• 3854 Answers
• Posted on Nov 04, 2009

SOURCE: i have a 1997 gmc jimmy. the abs unit locks up

There was a recall on the ABS system on your truck. The problem was the ABS sensor on the front wheels were getting dirty and corroded causing a faults signal to the ABS module. The fix was to inspect the ABS sensor and clean them with brake parts cleaner and re-gap the sensor to the speed ring on the hub. The ABS sensor and speed ring is on the inside of the front wheel hub, spry brake parts cleaner and re-gap the sensor to the speed ring with paper folded 5 times. I feeler gauge will work but put a paper between the sensor and gauge cause the sensor is magnetic and the gauge will stick. Look for damages to the lead wire to the abs, but i think that's all fine since you did not mentioned any abs light on. You may be even lucky with just a good spray of the brake parts cleaner. Good luck and keep me posted.

SOURCE: 1998 GMC 1500 4x4 4.3L ABS brake problems

Or you could just pull the fuse for the abs and not have abs but you won't wreck from pulsating pedal.

Johnny Brown

• 5763 Answers
• Posted on Feb 22, 2010

SOURCE: ABS Problem in my 2000 Jimmy 4x4

the best way to diagnose this problem would be with a scan tool while driving and watching the speed sensors, or check all your wheel tone rings make sure there are no cracks and they are clean, also have the computer scaned for abs codes there should be a code that may tell you which wheel speed sensor is acting up,you can also check the wiring, these seem to chaf the wiring by the control arm .a bad wheel bearing may also cause this problem, i would start with a scan of the abs system,good luck.