Question about 2003 Mazda Mazda6

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Brakes make a stuttering noise ... ABS light has come on infrequently ... had it on a Mazda diagnostic machine ... comes up as ABS hydraulic unit needs replacing ... cost is over $2000 ... looking for a better option if this is a common Mazda 6 fault

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I have had the same problem with my 2003 Mazda 6. It was a misaligned abs sensor on the passenger side wheel.

Posted on Feb 08, 2009

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Have you looked at the wheel bearings,I had same problem,I replaced every thing before I found the bearing problem.

Posted on Dec 16, 2008

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Can't get brake fluid to flow out antilock. Can't bleed brakes because no fluid coming out of the antilock system. Fliud going to antilock none coming out. Any fix on this.


did you read the FSM book first, or alldata.com pages on how to bleed your ABS system?, some cars require a scanner that can cycle the modulator to bleed out air.
97 626, ill look.
did you remove any parts , up stream of the modulator?
(called the hydraulic unit by mazda)
is the ABS lamp glowing?

here is page on HU swap. (would be worst case)
seems its not special bleeding type. "says "in the usual manor"

  1. If necessary, remove the fuel filter and igniter mounting nuts and move them out of the way.
  2. Remove the charcoal canister from the vehicle and if the vehicle is equipped with cruise control, remove the cruise control actuator.
  3. Disconnect the brake lines from the hydraulic unit. Correct reassembly is critical. Label or identify the lines before removal. Plug each line immediately after removal.
  4. Disconnect the electrical harness connectors to the hydraulic unit.
  5. Remove the 2 nuts holding the hydraulic unit. Remove the unit upwards.
0.) disconnect battery first.
The hydraulic unit is heavy; use care when removing it. The unit must remain in the upright position at all times and be protected from impact and shock.
  1. Set the unit upright supported by blocks on the workbench. The hydraulic unit must not be tilted or turned upside down. No component of the hydraulic unit should be loosened or disassembled.
  2. The bracket assemblies may be removed if desired.
To install:
  1. Install the brackets if removed.
  2. Install the hydraulic unit into the vehicle, keeping it upright at all times.
  3. Install the retaining nuts and tighten.
  4. Connect the electrical connectors.
  5. Connect each brake line to the proper port and double check the placement. Tighten each line to 113-190 inch lbs. (12.9-21.5 Nm).
  6. Fill the reservoir to the MAX line with brake fluid.
  7. Bleed the master cylinder, then bleed the brake lines.
  8. If removed, install the cruise control actuator and the charcoal canister.

Apr 15, 2015 | 1997 Mazda 626

2 Answers

ABS light on dash is stuck on how do I get it off on a 95 Ford Explorer Eddie Bauer edition


Unhook the negative battery cable for a couple of hours, then reconnect. If the code comes back, you may have a bad abs wheel sensor.

Feb 05, 2015 | Ford Cars & Trucks

1 Answer

What should I do when the ABS light comes on and won't go off?


AS long as the brakes are still functioning then you should be able to get home safely. The light is generally an indicator for a problem in the ABS system and with it on, the ABS system will not work. This means that in the event of an emergency braking, the brakes could lock causing you to skid.

My suggestion is to get the vehicle to a technician or workshop who has appropriate diagnostic equipment to read the fault codes. Keep in mind that the problem could be with a sensor on each of the wheels, a wiring problem, a hydraulic problem or an issue with the actual ABS unit itself. Without having it electronically diagnosed it will be guess-work and a costly affair.

The ABS system is a great safety feature and I would get it checked sooner rather than later. It is the type of thing that you don't realise its importance until you need it!

Apr 27, 2014 | 2004 Toyota Tacoma

1 Answer

ABS light comes on intermitantly and when the brake pedal is pressed on you hear a noise like a humming..pedal jumps up...


CAR IS NOT SAFE TO DRIVE.SOUND LIKE YOU HAVE PROBLEM IN THE HYDRALIC MODULATOR SOLENOIDS IN THE ABS HYDRALIC MODULATOR UNIT.THE DEALERSHIP NEED TO CHECK AND FIX.WHEN WORKING WITH ABS BRAKE SYSTEM YOU NEED DIAGNOSTIC EQUIPMENT TO FIX ABS BRAKES.

Jun 03, 2011 | 2003 Buick Century

1 Answer

Had new front brake pads and rotors installed last week. Get grinding noise in reverse when first starting out then it goes away. ABS light and 4 wheel drive light come on and flash. Brakes work fine, what...


First have the brakes checked, the abs and 4wd lights need to be checked, this is done with a scan tool, the computer stores codes telling you what part of what system has failed this will help in finding the problem, the noise my be a bad wheel bearing and has gotten bad to the point it has damaged the abs sensor and has made the lights come on , this is a guess you will need to have the computer scanned to get the codes. hope this helps, good luck.

Dec 10, 2010 | 2005 Mazda Tribute

1 Answer

ABS light intermittant, groaning noise


a sensor on one of the axles may have come loose & is being ground away!!
urgent inspection needed!!!
Cheers Rob

Aug 15, 2009 | 1994 Mazda 626

2 Answers

Abs light stays on


It sounds like you have a bad sensor on one of the wheels.Sometimes you can take the veh to autozone or advanced auto parts and they can hook it up to thier scanner and tell you which one is bad(they do this for free) if they have an abs scanner.

Mar 30, 2009 | 2002 Isuzu Rodeo

1 Answer

Both the abs and brake light is on and stays on what could be wro


Your ABS systems use a combination of electronic and hydraulic systems to modulate the brakes individually to prevent them from locking up. Antilock systems consist of wheel speed sensors, a hydraulic control unit (HCU), and an electronic control unit (ECU). Because of how complex the system is your computer does a self-test. If the check is successful, the ANTILOCK and BRAKE lights will go out within a few seconds. If one of the component of the ABS system fails to pass the test one or both lights will remain lit. One or both warning lights may also come on while driving, also indicating a problem. If just the ANTILOCK warning light comes on, some ABS component has failed, but the car still has hydraulic brakes. You or a technician will have to perform further testing to pinpoint cause and the proper repair.

Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 30, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Abs sensor light wont go off my 2005 polo


Your ABS systems use a combination of electronic and hydraulic systems to modulate the brakes individually to prevent them from locking up. ANTILOCK systems consist of wheel speed sensors, a hydraulic control unit (HCU), and an electronic control unit (ECU). Because of how complex the system is your computer does a self-test. If the check is successful, the ANTILOCK and BRAKE lights will go out within a few seconds. If one of the component of the ABS system fails to pass one or both lights will remain lit. One or both warning lights may also come on while driving, also indicating a problem. If just the ANTILOCK warning light comes on, some ABS component has failed, but the car still has hydraulic brakes. The grinding noise could the the ABS pump or your brake pads could to worn to the metal backing and grinding against the brake rotors. I recommend a inspection soon for your safety.

Mar 04, 2009 | Audi S4 Cars & Trucks

2 Answers

Anti lock brake light


abs relay some times go bad

Dec 05, 2008 | 1999 Oldsmobile Alero

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