On most cars the handbrake is applied to the rear wheels only. The footbrake applies to both the front and back brakes, with a bais to the front to help avoid the rear wheels locking up under heavy braking.
If you apply the breaks quickly on a slick road, the wheels' rotational movement will come to a complete stop, but the car itself will keep moving forward, causing the car to slip. It happens because the force of friction, Ff, is small. The traction of the wheels on the ground (which requires that the wheels continue to roll at the speed that the ground moves past them, which is what normally happens) is what allows the driver to maintain control of the car. If the wheels suddenly were not gripping the ground, which would happen if their rotational motion stopped, the driver would have not control over the car. Slowly applying the breaks is advised because the force of friction is not exceded by the force of the breaks. In otherwords, friction (traction) still causes the wheels to roll, mainting the driver's control over the car. If the force of the breaks exceeds that of friction, then the wheels will come to a stop before the car does.
it moves
Parking brakes apply generally on rear wheels to control enough sliding of the vehicle.
IF THIS ONLY HAPPENS WHEN YOU APPLY THE BRAKES THE MOST LIKELY PROBLEM IS THAT YOUR FRONT BRAKE ROTORS ARE WARPED. YOU CAN EITHER HAVE THEM MACHINED AT A QUALITY AUTOMOTIVE SHOP OR REPLACE THEM WITH NEW ROTORS.
Yes, the parking brakes can be used to stop the vehicle in emergency. But remember that, in most of the vehicles parking brakes apply only to one pair of wheels, so if the vehicle is in high speed, one has to apply them carefully and save the vehicle from skidding.
What is stab braking?Apply your brakes all the way.Release brakes when wheels lock up.As soon as the wheels start rolling, apply the brakes fully again. (It can take up to one secondfor the wheels to start rolling after you release the brakes. If you re-apply the brakes before thewheels start rolling, the vehicle won't straighten out.)This is directly from the NYS CDL Manual.
Your power brake booster is probably bad.
What is stab braking?Apply your brakes all the way.Release brakes when wheels lock up.As soon as the wheels start rolling, apply the brakes fully again. (It can take up to one secondfor the wheels to start rolling after you release the brakes. If you re-apply the brakes before thewheels start rolling, the vehicle won't straighten out.)This is directly from the NYS CDL Manual.
1) they will feel mushy 2) the breaks will not apply as much force as usual, thus poor breaks.
Centric Breaks or the most common variety of breaks and most cars have them. To check and see if they are working, pump them a few times. If the breaks are hard to apply then you might need to replace them
turn your wheels right and apply parking brake
That definition could apply to any volcano.