A pulsating brake pedal on your Kaiyi E5 is usually caused by uneven brake disc surfaces or runout, not always truly warped discs.
Here is what to check first and whether it is safe to keep driving.
Why your Kaiyi E5 brake pedal pulses
A pulsating pedal under braking is a classic sign of uneven friction at the front brakes. On the Kaiyi E5, the usual culprit is not a literally bent disc but uneven pad deposits or thickness variation on the rotors, often described as warped discs. Less often, actual rotor runout, a worn wheel bearing or hub, a sticking caliper, or an ABS wheel-speed sensor issue can create a similar feel.
I would check the basics first: rotor surface and thickness, lateral runout with a dial indicator, pad wear and contamination, caliper slide pins and piston movement, wheel-bearing play, and tyre pressures. If the ABS light is on or the pedal pulses mainly at very low speed, scan the ABS system and inspect the wheel-speed sensors and tone rings before replacing discs.
