Problem with my 1995 Pontiac Grand Prix
3.1
ABS
Replaced pads rotors.
Recent master cylinder.
tech = JK
question = this is an intermittent trouble after driving for a while
the abs light comes on there are no codes stored in the computer. This
has been an ongoing trouble that began long before this last brake
service.
I have connected the autoxray 5000 scanner to the computer port and had
the car driven when the abs light comes on no fault codes are
displayed. We have replaced the master cylinder and completely bled the
entire
brake system starting at the distribution abs modulator block all the
way to the calipers. The brakes work fine but the abs light still comes
on after driving the amount of driving varies we are leaning heavily to
an electrical and or electronic failure of the abs control module but
would like some assistance to narrow the trouble down
JK:
I am not familiar with this model scanner, but i assume it is capable of
reading codes. An ABS light on with not codes is usually an EBCM problem.
Anytime there is a warning light, there SHOULD be codes. I have not had
many ABS light without codes. Motor packs are common, speed sensors,
harnesses, but ALWAYS codes.
I would suggest checking with a different scanner to be sure.
3.1
ABS
Replaced pads rotors.
Recent master cylinder.
tech = JK
question = this is an intermittent trouble after driving for a while
the abs light comes on there are no codes stored in the computer. This
has been an ongoing trouble that began long before this last brake
service.
I have connected the autoxray 5000 scanner to the computer port and had
the car driven when the abs light comes on no fault codes are
displayed. We have replaced the master cylinder and completely bled the
entire
brake system starting at the distribution abs modulator block all the
way to the calipers. The brakes work fine but the abs light still comes
on after driving the amount of driving varies we are leaning heavily to
an electrical and or electronic failure of the abs control module but
would like some assistance to narrow the trouble down
JK:
I am not familiar with this model scanner, but i assume it is capable of
reading codes. An ABS light on with not codes is usually an EBCM problem.
Anytime there is a warning light, there SHOULD be codes. I have not had
many ABS light without codes. Motor packs are common, speed sensors,
harnesses, but ALWAYS codes.
I would suggest checking with a different scanner to be sure.
/
WARNING LIGHTS
Anti-lock brakes are designed to prevent skidding and help drivers maintain steering control during an
emergency stopping situation. In cars equipped with conventional brakes, the driver pumps the brakes,
whereas in cars equipped with four-wheel ABS, the driver keeps a firm foot on the brake allowing the
system to rapidly and automatically pump the brakes. Because the wheels don't lock up, drivers have the
ability to steer around hazards if they are unable to stop in time.
When the braking force created by the driver is greater than the tire can handle, the wheel can lock up.
Locking wheels can create vehicle instability problems and prevent steering around obstacles in the
road. Stopping distance on many slippery surfaces will also increase with locked wheels. Four-wheel ABS
prevents wheel lock-up in situations in which the wheels might normally lock, such as on slippery roads.
emergency stopping situation. In cars equipped with conventional brakes, the driver pumps the brakes,
whereas in cars equipped with four-wheel ABS, the driver keeps a firm foot on the brake allowing the
system to rapidly and automatically pump the brakes. Because the wheels don't lock up, drivers have the
ability to steer around hazards if they are unable to stop in time.
When the braking force created by the driver is greater than the tire can handle, the wheel can lock up.
Locking wheels can create vehicle instability problems and prevent steering around obstacles in the
road. Stopping distance on many slippery surfaces will also increase with locked wheels. Four-wheel ABS
prevents wheel lock-up in situations in which the wheels might normally lock, such as on slippery roads.
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