Sunday, April 29, 2012

2008 Toyota Tacoma: ABS causes Brake pedal fade?

Soft or Spongy Brake Pedal when ABS not getting Activated.
Many Toyota Vehicle owners and other car owners having ABS system in the car have complained and noticed this problem.

Basically what happens in this problem,that Normal braking is perfect on Smooth pavement and brick roads.But on rough roads such as wash board type roads the Brake pedal gets soft and Driver has to apply complete/ more pressure to stop the vehicle.

On basis to Toyota Tacoma Truck vehicle models i will say that,These trucks are so light in the rear when on a bumpy road and applying the brakes the ABS will activate prematurely. Are you feeling the abs actuator motor come in and pulse the pedal. If this is the case there is not much you can do about it short of putting weight in the bed or disable the abs to see if this is what is going on.

Other Option is that ,You are experiencing premature ABS activation and your hearing the actuator pump activate and you can feel the brake pedal flutter.

But if this is not the case then i will say ,
The ABS is going to activate on any car that is on wash board type roads due to the tire being in a non contact situation with the road even if for a split second and if the brakes are being applied that one or more wheels will have a tendency to stop or slow faster then the rest of the wheels and the computer interprets this as sliding or skidding and will active the abs system. I get this complaint a fair amount when customers life on old brick roads. If there are no codes triggering the computer and the normal braking action is good with no pedal fade there is not much your going to be able to do with the wash board type problem. The only other thing that I have seen is if the rear shocks get bouncy which if they are the Bilstein shocks it will aggravate the problem even more on wash board type roads.

TO understand about how the ABS causes pedal fade.OR Why the ABS causes Soft Pedal.
Read the further details with more explanation:-----

When any of the wheel speed sensors detect a rotational deviation or different from the others it causes the actuator assembly to activate the pump motor which generates brake fluid pressure to the other wheels causing the wheels to brake which in turn causes a slight pedal fade for pulsation in the actual brake pedal itself. If you are not feeling this pulsation occurring or any buzzing from the actuator motor when this situation is occurring then it is not related to the ABS or actuator motor activation. Bumpy roads or washboard type roads should have no effect on the brake pedal travel unless the ABS is prematurely coming on. If you're feeling a soft or spongy pedal and the ABS is not activating then you have a hydraulic pressure problem. This possibly could be something intermittent in the master cylinder. However to correctly diagnose the problem you or your mechanic has to measure pedal pressure or distance traveled or fade. The bottom line is you need to determine whether not the ABS system is activating when you're noticing this problem.

This details will help.

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