2003 Chevy Astro brake pedal noise

Tiny
PALAFORNARA
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 114,000 MILES
Intermittent noise. When car is nearly at a stop, there is a slight vibration and resistance(pushback on the pedal) and a low buzzing type sound from the pedal. This feels like the ABS is being engaged, but the car is dry surface. I checked the DOT 5 brake fluid. It seems ok, but might be just a little low and may be dirty since the fluid appears to look like dirty motor oil. The brakes are otherwise fine.
Friday, March 5th, 2010 AT 9:42 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It does sound like the ABS is kicking in. Check all sensors. Something is telling me that one of the stators is dirty and causing a sensor to kick in because it thinks the wheel locked up.

Let me know what you find.
Joe
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Friday, March 12th, 2010 AT 10:30 AM
Tiny
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  • 4 POSTS
Can I clean the stator(s) are they eaisly accessible or WHERE ARE THEY?
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Sunday, March 14th, 2010 AT 5:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
THe stator is an start like item that will be located right infront of the sensor. When the tire spins, the sensor (magnut) identifies a small electrical signal because the stator is close to the sensor then there is a slight break. When a magnetic field is broken then received over and over, it creates an electrical current. WHen the wheel locks, the current stops and the ABS identifies that lose and releases pressure to that wheel. Regardless, yes you can clean it and it is right next to the sensor.
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Sunday, March 14th, 2010 AT 8:59 PM
Tiny
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  • 4 POSTS
Sorry, im a dope. Where is the sensor for the stator. Near the brake pad, near the calipers, on the inside or outside the tire/wheel rim. Are there sensors for all four wheels. See ! Im a real dope. Also What does it look like! Do I just squirt water on it, do I rub it with a cloth or brush?
I can save a bundle of money if I just need to clean it/them

Thanks
Paul
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Monday, March 15th, 2010 AT 9:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It is behind the backing plate at each wheel.

Let me know if you have other questions. You could even use something like brake cleaner if they have grease or dirt on them and then wipe them clean.

Let me know if you have other questions.

Joe
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Monday, March 15th, 2010 AT 10:19 AM
Tiny
PALAFORNARA
  • MEMBER
  • 4 POSTS
What if I just disconnect the sensors. The brakes woulkd still work, I assume.
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Tuesday, March 16th, 2010 AT 12:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
The brakes will work but you will loose ABS.

Joe
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Tuesday, March 16th, 2010 AT 1:11 PM

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