Question about 1999 Mazda 626

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Mazda 626 (2000) ABS light comes on sometimes

I replaced my front discs and brake pads and since then the ABS light comes on and goes away intermittently. Otherwise the brakes are working fine.

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  • axs1276 Jul 26, 2009

    Thanks for your comments. I checked the sensors and their wires and they look undamaged.

    I remember that I did push the pistons almost to the bottom and I did not have the bleeder valve open. So I think that dirt getting into the module is a possibility. Will it go away if I do the bleeding?

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Try the folllowing: 1. Check the clearance between the wheelspeed sensor and the sensor rotor, must be between 0.3 - 1.1mm. 2. Disconnect wheel speed sensor connector and check the resistance at the ABS wheel speed sensor, must be beween 1.4 - 1.8Kω.

Posted on Jul 30, 2009

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This is most likely caused by an erratic wheel speed sensor when the car is turned on it does a abs system check. When the light goes on and off it is because probblem only shows up when wheel speed sensor signal is vaulty. Since you just did the front brakes and know the problem started, it is most likely that the sensor got damaged or misaadjusted. The other thing you need to check is, the sensor is magnetic and can catch alot of debris, like metal shavings from a freshly turned rotor or other metal particles. I would see if there clean and the reluctors are clean to, also check connection and wire make sure it was not damaged. The other thing that can happen but is least likely is that, materials can be pushed into the hydraulic control module. This happens by forcing the piston to the very bottom without opening the bleeder valve since, this is where dirt and corrosion usually accumulates.

Posted on Jul 25, 2009

  • carl Jul 27, 2009

    I got an email with the problem you are having, you can try bleeding the hydraulic system but it usually dosent do it. If the sensors where clean and aligned correctly to insure the right air gap, which would have to be measured and compared to specifications, and the reluctor wheel had no debris also. I havent seen this much but the sensor could have been demagnetized, but honestly, if bleeding the calipers dont do it see if a paper clip sticks to the sensor. I recommend having it diagnosed by a qualified technician who will have a good scan tool and is familiar with abs systems.

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