No brakes on anything work because of gravity. Pressure and friction are what stop anything utilizing brakes. On a bike, you pull the brake lever on the handle bar and it pulls the line connected to your brakes. The two brakes pads on either side of your wheel compress, applying friction and thus stopping your bike. The harder you pull, the faster you stop.
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!!!
Yes, a bike will work in space. If it is a mountain bike it will work perfectly on the moon, but the tires may burst because of the pressure change in space. Since there is no oxygen in space, you can ride a bike perfectly, but on the moon there is no gravity so the bike will go faster and you may even fly with it. If you are pedaling hard there will be more resistance, if you are going slower the bike will ride smoothly just like on Earth.
Impossible to answer from such a short description, but probably you need to tighten the cables one way or another. Try the related links.
because of gravity
Because it depends on gravity to work. -Gravity doesn't work horizontally .
MAYBE - , frame size has nothing to do with tire size. Style does, and if its a mountain bike, it will not work with a 27 (road racing) wheel and tire. Brakes will not fit.
Don't stomp on the accelerator, because with no brakes you couldn't stop.
Make sure that the bike is in working condition, that the chain engages properly, that brakes work, that tires are decently inflated and in good shape.
check the brakes work. check the wheels spin freely (lift the bike up off the ground). adjust the saddle height to suit. adjust the handlebars. pump up the tyres. lubricate the chain soon. then ride it!
Rim brakes don't work well in the rain, because the rims get slippery when wet. But not all hand brakes are rim brakes. A hand activated drum brake will work just as well in the wet as in the dry.
Sorry. They can't, because gravity is real and centrifugal force isn't.
The best way is to open the cylinder bleeder and let gravity work,when fluid flows without bubbles close the bleeder.