I have a 2000 Jeep Cherokee Sport 2wd. I just bought the vehicle and on test drive could feel it needed new brakes. The vehicle sat for about a year. I'll explain what is happening and then explain what I've done so far.
When driving the vehicle, I have a great pedal until I just about have to stop. Right before I completely stop, the brake pedal gives out and a loud noise is coming from the front of the vehicle(under the hood). In the pedal, you can feel somewhat of a knock when it does this. The vehicle, for a brief moment, discontinues braking then immediately brakes again bringing the vehicle to a stop. The ABS light doesn't come on.
What I've done: I noticed a lot of rust on the calipers, rotors and very thin brake pads, i guess from sitting. I replaced the calipers, rotors and pads and the problem still exist. My next thought was Brake lines, so I inspected them and appear to be in really good shape, no "ballooning" what so ever and no signs of dry rot or leaks. I can't find a single leak anywhere in the brake system. My next thought was Master Cylinder. I was driving to pick up a new one, but pulled over to try something...I pulled the fuses from the ABS Sol and ABS Motor. ABS light came on and I started down the road, got up to about 25 mph and began to breke and my initial problem went away. The Jeep slowed down great and came to a complete stop with no problems and the pedal felt great. So, now I figure I am in the right area. I checked the sensor's(they are fixed and cant be adjusted for distance) and they were really dirty so I cleaned them up and put them back on. I plugged the fuses back in and problem came back...I did try just plugging the ABS Motor back in without the ABS SOL, the Jeep comes to complete stop with no issues, but one thing I noticed, when holding the brake pedal down at a complete stop, If I slowly let off the pedal, I can feel the "pulsing" so I know something is working, but it just doesn't work when I have everything plugged in...
I was wondering if anyone else has had this issue and where do I go from here. I can't think of anything else besides replacing the ABS Sol. I want to hear what others have to say before I start diving into replacing the ABS, just in case I don't have to...
Do a search using the word antilock. You will get some hits. I recently had an ABS issue, but not like yours. Mine ended up being the small black plastic device under the rear seat (drivers side), that mechanically senses acceleration and deceleration - it must be mounted properly to work or the ABS light illumuinates. I had a hard time finding anything on it, but got the most hits using the word antilock, not ABS. I recall seeing posts similar to your issue. JB
I'd start with a good cleaning of tone rings (I know you said you cleaned the sensors, but did you clean out the teeth of the tone rings?) and connections having to do with the wheel speed sensors. Erratic wheel speed readings can cause all sorts of funky things. If that doesn't work I'm wondering if the problem may be that the ABS controller isn't getting an accurate vehicle speed reading... it's supposed to disable the ABS at low speed (probably <5 MPH) does your speedometer work OK?
well went to dealer plugged in the drb 2 or 3 scanner and no codes at all .another dead end. mechanic drove jeep and inspected system. said to clean the tone rings so i said do it 135 bucks later same bs not all the time i ordered a abs sensor for front ( both the same) im going to switch it out to isolate which wheel is simulating the lock up my money is on a sensor problem lets face it chrysler has cheap wiring & defective abs control modules.check out youtube . my friend has a 01 sport and his obd 2 is not reading anything at all ! go fiqure will let you know more along the endless search good thing it runs ok
been looking all over the internet for an answer to this problem. i have a 2000 xj that has the same problem with the brakes just before i stop
Did you find out what the problem was?
I have the same with my 2001 xj 60 th ann after an overhaul of my rear diff. Cleaned the sensor and tonering but no change. Next week to the jeep dealer for a obdIII scan. But I am interested if your problem is solved and how exactly?