If your brake pedal is getting harder to push you may have a faulty vacuum pump in your brake booster system. Used on power brake cars, they accept a vacuum hose and pump from the engine manifold, and use that vacuum pressure to assist in the movement of the master cylinder.
The ABS sensors and relays measure the different information within the braking system and send the information to the ABS control unit. If your ABS is starting to act up check your sensors and relays right away.
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