How to find the problem with truck's braking system

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February 6, 2010

Auto Scanner The Salem News Sat Feb 06, 2010, 06:00 AM EST

Q: I have a 1998 Ford Ranger with 100,000 miles, and I am having issues with the anti-lock braking system. A few days ago, when I stopped very quickly in highway traffic, the ABS engaged. Now, whenever I stop quickly, at 15 to 20 mph, the ABS will engage and the wheels feel like they're gliding to a stop. The brakes were making a soft, rubbing sound with the vehicle rolling. When I engage the brakes softly, there's normal stopping.

I've had my trusted buddy mechanic check all the brake issues. The ABS sensor was replaced, and for the most part the brakes are OK, except for the hard-stopping issue. The rubbing sound is greatly diminished. Also, the major auto repair CD-ROM database my buddy uses did not have any issues referring to this problem, and the computer scanner did not detect any issues from the braking system.

A: Let's start with the year and make of the vehicle. The 1998 Ranger had many issues with the rear spring shackles rotting out. When the shackles rot, the rear end can move on its own, independent of the body. So when you step on the brake, they will indeed lock up and cause the ABS system to be active.

The rubbing sound could be anything from a bent backing plate to a piece of anti-rattle hardware rubbing, and even a bad wheel bearing. That would have to be seen. So, first thing to check is for the rear shackles, right? Now if they are OK, go with your buddy for a road test, and attach a good scanner to the ALD port. Monitor wheel speeds. When you apply the brakes, see which one falls out first, and you have your culprit right there. Sometimes, especially with Fords, the rust under the sensor will give it a false reading.

Next issue is the AllData monthly subscription your friend has. There is a wealth of information in the AllData system, and I consider it one of the best out there. I use it each and every day along with millions of shops worldwide. Here's the deal on AllData or any other information source: You have to know where to look for it. And that's where the problem is.

There is no lesson that teaches you how to look within the system. This takes time, experience and experimentation. The nice thing about AllData is they have an A-Z look-up in the middle upper area of the menu. There, you can find just about anything. If your friend needs help with the AllData, have him give his area representative a call, or he can call me and perhaps I can help him out.

Car Care Tip: Did you know Sylvania now sells a new and improved back-up light bulb? It's called the Silver Star Signal. This is a must for anyone who has a back-up cam on their car. It gives 30 percent brighter and 20 percent whiter light when backing up. Installing is just like changing any car light bulb.

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Larry Rubenstein is a master technician who owns a North Shore service station. His column appears every Saturday. Write to Larry at The Salem News, c/o Auto Scanner, 32 Dunham Road, Beverly, MA 01915, or send e-mail to scanauto@aol.com.

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