Some thing is definitely worn or loose, get it checked out immediately. There are a number of possible causes, ranging from a loose brake calliper or pads, to worn suspension joints.
It depends on how fast you are traveling, how well your brakes work and how much braking force is applied. If you are going 1 mph and slammed down on the brake you would stop instantly. If you are going 100 mph and lightly touched the brake who knows when you would stop.
Vacuum brake booster is defective or the hose going to the booster is leaking.
NO. A knocking noise in the engine is a problem in the engine.
by me knocking u out
If your brakes work going backwards better than forwards, you should replace your front brakes. You can get your rotors turned to save time, as well.
slowly push it along then pull the brakes, if it stops, THE BRAKES WORK!!! if it keeps going, THE BRAKES DON'T WORK!!! IT'S ROCKET SCIENCE!!!
get a new trany or rebildit cuz its going out unless the knocking is from moter it might be timing
water in distributer, wet spark wires
If your feeling that knocking noise in your foot that's most likely going to be your ABS (anti-lock braking system) kicking in. It usually happens alot in the winter to us in the North East, so pretty normal as for the turn..... i would look into an axle being bad do to the skipping of the teeth that it rides in
You wouldn't want to be going down an incline (a hill) and find you have no brakes!
you either need to bleed your brakes, add fluid or get a master cylinder darrellshandyman@live.com
My MX6 was just doing this on the way home. If I stepped on the gas, braked, or turned it would stop. The frequency of the knocking noise would increase with the speed, but seemed louder the slower I was going. The brakes were just done last week. Anyway, in my case the wheel lug nuts were loose, I could just unscrew them by hand! I will be calling the garage tomorrow to let them know.