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#1
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E39 ABS/ASC Problem
When I drive away in my 97 528 and hit the brakes it feels like a wee man is
hammering away on my brake peddle - the sensation you get when ABS kicks in normally - but after a short distance/time the ABS warning light and traction control warning lights come on and everything feels fine from then on. Simple problem/solution or is this the start of something worse? |
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#2
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"lviren" > wrote in message ... > When I drive away in my 97 528 and hit the brakes it feels like a wee man is > hammering away on my brake peddle - the sensation you get when ABS kicks in > normally - but after a short distance/time the ABS warning light and > traction control warning lights come on and everything feels fine from then > on. Simple problem/solution or is this the start of something worse? Check the ABS sensors and be sure they're clean, intact, and connected properly. -Russ. |
#3
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Somebody says to check the sensors, this is always good, but I do not think
it is your trouble. It sounds to me like your ABS is activating any time you use the brakes and the ABS light is off. This is not normal operation, and the ABS system eventually figures out that it is doing stuff that it hasn't been asked to do - this is a fault that sets the ABS light on. When the ABS light is on, the ABS system is DISABLED, and you then feel the brakes working normally. The trouble is, they are working the same way automotive brakes worked in the '60s, the brakes can make the tires lock and this can put you into a skid. HERE IS WHAT ABS IS SUPPOSED TO DO WHEN IT IS WORKING RIGHT When you step on the brake for a normal stop, approaching slower moving cars, stop signs, entrance to the liquor store, whatever, the brakes stop the car smoothly and evenly. If you are doing any sort of panic stop, hauling the car down from freeway speeds to a stop in a very short distance, or even a normal stop but there is ice on the road, one or more tires might lock up and skid. This is where the ABS kicks in. It will automatically release then reapply the braking pressure to that (or those) tire(s) several times per second to maximize the braking process AND let you retain steering control and directional stability of your car. There is considerable argument that it can shorten or lengthen the overall stopping distance, but there is no argument that the car can be steered under full braking if the car has ABS and the ABS is working. The ABS is a system that can not fix itself once it has detected an error in its operation. That is, the car is turned on and the ABS does a self test and the ABS light goes out. The system constantly moniters itself, and if it detects an error, it will shut down and revert to the same braking capability that was available before ABS was ever used. There can be errors with the sensors that tell the system the tires have stopped turning, and there can be an error in the valve body that controls the pulsating feeling you report. The valve body costs in the neighborhood of $1500 to replace. I said the system can not fix itself, this is true but deserves deeper exploration. When the engine is shut off then back on again, the self test repeats and the trouble might not be detected again until the brakes are used or the car begins moving. Any error in the ABS system will turn the ABS light on. If the ABS light comes on when the car begins moving, or soon afterward or an any time that is not related to actually using the brakes, then the odds favor one or more wheel sensors not functioning properly. If the ABS light comes on after using the brakes and there is a pulsating feeling (little man hammering on the pedal) and you have no reason to think the ABS should have kicked in, then you have trouble with the ABS controller or the valve body. When the ABS light is ON, the ABS system is disabled. The brakes still work fine, but the ABS feature will not be there and you should operate your car accordingly. Do not engage in behaviors that can result in skidding, if you drive on snow and ice, then do not expect to be able to steer if you need to stop quickly. "lviren" > wrote in message ... > When I drive away in my 97 528 and hit the brakes it feels like a wee man is > hammering away on my brake peddle - the sensation you get when ABS kicks in > normally - but after a short distance/time the ABS warning light and > traction control warning lights come on and everything feels fine from then > on. Simple problem/solution or is this the start of something worse? > > |
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