You have a severely warped rotor. Have your brake pads replaced and the rotors turned or replaced. Any machine shop can tell you if the rotors can be turned or need replacing. You must replace the pads and do it on both front wheels. Over tightening the lug nuts can cause this. Tighten them to the correct torque setting. Another cause of this problem is running a car through a car wash after hard braking, before the rotors have had time to cool. Because the water strikes only one side of the rotor, that side cools and contracts, bending the metal. It doesn't happen in the rain because both sides get wet at the same time.
The brake pedal and the accelerator pedal can cause a change in speed.
Your brake rotors are warped.
Get some speed up, then brake hard. If you feel the brake pedal pulsating you have ABS:
It's near the brake pedal or brake light switch.... It deactivates cruise control
gearshift, brake pedal, and steering wheel.
This problem is not likely to be directly related to having replaced the front brake pads, although it may be possible that your brake pedal height was altered somehow, especially if you had a leaking brake line or bled the brakes. Check your brake switch, it should be located near your brake pedal inside the cab and under the dash. You should be able to locate it by pressing and releasing the pedal while looking for a button or switch that is contacted (by the pedal) by doing so. Said switch must be adjusted so that the pedal will activate the switch (usually by holding a button switch in) when the pedal is released. Some trial and error adjustments will tell you what works properly and what doesn't. Having a friend watch the brake lights and telling you when they're on or off while you make adjustments will speed up the process.
If traveling, lower speed below 40 mph, put foot on brake pedal and then pull 4x4 lever toward down to 4 high. When parked, put foot on brake pedal and pull same 4x4 lever into 4 high. Brake pedal needs to be utilized (if only to slow down) to do this. Keep foot on brake pedal until in 4x4.
A car will move when the gas pedal is engaged. You can control the speed of the car by the pressure you put on the gas pedal. The brake pedal will either slow the car down or stop the car entirely.
it sounds like to me that your master cylinder might be bad
Upon pressing the accelerator pedal, the fuel/air mixture supplied to the engine increases, which results in a larger explosion and more power, thus propelling the vehicle at a faster speed
In a lot of different ways, if you press the gas too much, to reach a higher speed too fast, if you brake too much and then step on the gas, a car spend more gasoline to reach a certain speed than to maintain it, so let the car reach the speed you want gradually and than try maintain the speed pressing less as possible the gas pedal.
Theres a snake with a need for speed in your car, and he doesent like you slowing down.