I changed the brakes and the rotor on my 02 c240 Benz and it still making a clunking noise and shakes when braking.

it could be but you would probably get that w/o braking too.Have it ckd out

replace the caliper and rotor and brake pads

Check all brake part's are seated correctly and all fitting bolt's are tight. As for A.B.S light plug in to test port to find which wheel is causing the problem it is posible to damage sensor tip's when servicing the brake's or it maybe a connection problem. Hope this help's.

The rear suspension has no drive parts as your car is a FWD, front wheel drive. There are parts on the wheel axles which have bearings and also Brakes.
If you have rear disc brakes, the inner part of the rotor has a drum for Emergency brakes and these linings often peel off their brake shoe. The loose lining can get ground up in the turning rotor hub. The Emergency brakes are pinned to the brake backing plate and can clunk when the shoes shift. If you have rear drum brakes the shoes may be out of adjustment or worn out leaving room to rock as vehicle direction changes.
Bearings, excess play can cause noise. Suspension brackets, bushings within the mounts for these components can wear out. When parts are moving in 1 direction a "set" is grooved into the rubber parts. Changing direction of travel will unseat the part and make noise.
Traveling sound. You may be hearing a sound you suspect is in the rear of the car, but is actually a cradle mount around the Firewall. Sound travels through metal.
You need to get the rear wheels off the ground and check for play in all the components. For the cradle mounts, have someone ride the brake pedal and shift the transmission forward and backward to see if noise is generated or excess play is seen.

check front end bushings and suspension setup sounds like bushings are worn out.or shocks are needing replaced

your break pads are out you need to replace them asap before you damage your rotor. good luck

If fluid leaking from the master cylinder finds a way into the servo or booster it could cause an entirely different sort of trouble. Master cylinders are usually very reliable unless contamination of the fluid has taken place - usually indicated by a darker than usual fluid colour and sediment in the reservoir, evidenced when a strong light is used.

A loss of brake pressure could signal the master cylinder is failing (the pedal creeping towards the floor) or a brake booster problem, perhaps caused by insufficient vacuum or an air leak. An assistant is useful when looking for such problems and also when searching for noises.

The steady clunk being felt on the brake pedal might be something fairly obvious like a wheel balance weight just touching a caliper when the brake is applied. It is time to become a detective - I recently had one of those. One wheel had a second row of balance weights that caused no problems until I fitted new brake pads.

If a close and careful examination and a vigorous shake of everything by an assistant provides no clues, it could be worth checking the air gap between the ABS sensor(s) and the reluctors if they are the exposed type. Sometimes corrosion reduces the diameter of the reluctor and increases the air gap so the signal is lost at low speed. The ABS brain thinks the wheel is not turning and tries to operate the ABS on that wheel. Usually not a steady clunk but you never know, it could be worth checking...

This could be one of 2 problems,a warped brake rotor or bad wheel bearing.

sounds like u need to see the dealer on the start problem, to many possibilities, if I had to guess I would say engine problems, the brake issue is warped brake rotors, they need to be taken off and replaced or turned true on a brake rotor lathe.

Check your brake hardwares make sure its in proper places and not loose. you would also want to check the caliper sliders, clean and lubricate with silicon lube. and lastly make sure that rotor backplates are not touching the rotors, you can do this by spinning the rotors while the wheel is off, if it is, then pry the backplates a little. hope this would help, goodluck.!