How can "brake assist" be disabled on a yaris 2014
If the brakes appear hard, you are likely not getting effective braking to all wheels evenly. First, check your brake fluid. If the fluid has become cloudy or black, replace the brake fluid, then bleed all lines.
Inspect all brake calipers for fluid leakage, rotor scoring, and pad wear.
I would suspect that the cause of your "hard" braking is either dirty fluid, a bad master cylinder, or a defective proportioning valve.
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