We have a Pontiac Sunfire year 2000. My wife has been complaining "on and
off" about vehicle braking problem that it slip from time to time with no
specific pattern (day or night, rain day or hot condition) . Basically she
said that when she apply the brake at the stop sign or red light, sometime
it would slip once causing the car to take off then stop. No ABS pump noise
and no wheel lock. I have the car brake done a month ago with new rotors
and new pad (old one were worn and old rotors rust a bit but still
acceptable from vehicle safety inspection point of view), rear brake shoes
are like new. This vehicle has ABS and traction control that always on
while she is driving. I took the car out for test drive many times and
could not duplicate the problem. I believe her braking diagnostic problem
because she is usually never wrong about car develop new symptom that is out
of the norm. My driving habit and her is not the same as she is gentle with
her acceleration and stopping but that should not be a factor. Does anyone
has similar braking concern as this and how did you solve it?
I sometimes drive a 99 GMC 3/4 ton, at work, that does the same thing. My
theory is that when the a/c kicks on or off, the rpm's change enough to
cause the truck to move a little. Not my truck, so I haven't really
investigated it but that's what it feels like. If I make the concious effort
to press the pedal a little harder at stop lights, it doesn't move.
This problem of mine might be related. I have Pontiac Montana 2001 and I
recently noticed that whenever I brake to come to a full stop, I can
feel pulsating vibration like I am hitting a "regularly intervaled small
bumps". I can feel it not from the brake pedal so I guess it is from
Could someone give me some pointers about this problem before I go to my
mechanic? I would really appreciate it.
Thanks in advance.
(PS: To reply, please remove "nospam". Thanks.)
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