1998 Mazda 626 Mazda 626 Brake Problem

1998 MAZDA 626
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FDQX
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Brakes problem
1998 Mazda 626 Front Wheel Drive Manual

I have had a problem with my brakes for a while. When I brake from higher speeds (over 50mph) the brake pedal vibrates and steering wheel shakes violently. The car sounds and feels like an earthquake from the front end, the noise comes from ABS unit or brake cylinder. Sometimes the wheel shakes so much I almost lost control of the car. The power on the brakes is very weak.

ABS doesn't work, if I press the brakes harder the vibration is not so bad but the brakes lock. ABS module doesn't give any fault codes and the light never comes up.

Every brake rotor and pads are changed as well as the lower balljoints, but the problem is still there. When the rear brake rotors and pads were replaced, the problem went away for about a week but then came back worse. Before the change only the pedal was shaking and the earthquake noise didn't appear.

One day I kicked in the brakes hard several times in a row when at high speeds, and the brakes started to work a little better. But the problem comes back in one day.
Jun 21, 2010 at 1:47 PM
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RASMATAZ
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Hi fdqx, Welcome to 2carpros and TY for the donation

My suggestion here is you need to have all the brake rotors checked for out of roundness and parallelism-could be warped though its new

Make sure your lugnuts are torqued to specs, check for looseness on the caliper bolts/guide pins to include the wheel bearings
Jun 22, 2010 at 2:32 AM
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AUTOZONEBRAKESEXPERT
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If your pedal pulsates when you apply the brakes:
* Pedal pulsation is caused by excessive run-out in the rotors or drums that are out of round. These conditions occur due to excessive heat.
* It is important to differentiate a warped rotor condition from ABS operation. When the ABS kicks in the driver may experience pulsation in the brake pedal. This could be confused with a warped rotor.
Apr 10, 2011 at 9:20 AM
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