Brakes low brake pedal car dont stop right away when you applied sudden brake. brake shoes & pads are new & so are the drumbrakes.the mechanic already adjusted the rear brakes but problem stll exist when i can replace the brakes drum

If all brake system good and not jam you probably got air in the brake system you got to bleed the system that mean starting from the right rear open the bleeder by gravity fluid will start coming out make sure you top off the fluid . On the master cylinder where the brake oil goes use dot3 oil DONT press the brake peat just leave it open and the gravity will do the job and you see only oil coming out of the bleeder close it and the same thing on the rear left and after the right front after the left front DONT FORGET TO FILL THE MASTER CYLINDER KEEP IT ALWAYS FULL after closing everything your brake should be good take your time the clean the brake oil that leak out simple apply water good luck

Once you have bled the air from the brake lines,clamp off the front brake hoses carefully.Does the pedal feel better now?
Then the pad /caliper fit is allowing too much play.Is the pedal the same?Then clamp the rear hose and try the pedal.Is it fine with the rear hose clamped?If so we now know the problem is at the rear brakes.One common low pedal rear brake cause is brake shoes that do not fit the drums.Remove the drums and look at the shoes,are they showing contact wear fully or just in the middle of the shoe?Remove a shoe and place it in the drum.Can you rock the shoe against the drum surface?Once drums have been resurfaced,the shoes will not fit fully against the drum allowing the shoe the flex when applying pressure to it and this can easily create a low soft brake pedal. Of course rear brake adjustment must be correct once brake shoe contact is correct.To correct brake shoe contact,have your shoes re arc-ed to fit resurfaced drums or install new drums.Don't overlook brake master cyl /brake pedal push rod adjustment too.

Pedal, not peddle. First make sure reservoir is full at the brake master cylinder. Then check your brake pads (for disc brakes) and/or brake shoes (for drum brakes). When the pads or shoes are very worn down, you will get a low pedal. If you have disc brakes on the front and drums on the rear wheels, first try just replacing the front brake pads. If you get a good pedal after the front is done, many people tend to let the rear brake shoes go unless they are making noise. These systems are designed to put most of the braking force on the front discs, so the rear shoes do not need changing as often.

Most likely the brake shoe in that wheel is worn down to the rivets and those metal rivets are scraping on the drum. If you have a new brake shoe installed right away you will be ok. if you wait, you may also have to have the drums turned. By the way brake shoes come in pairs so they will change both front brake pads. Joe

FIRST adjust rear brake starwheel while spinning tire FOWARD. then alongside drivers side of car find emergency brake cable adjustment (long threaded rod with nut) . hold one end of rod with vise-grips and turn nut until emer. brake cable has less slack in it. now go inside car and apply e-brake.you dont want the pedal to stop right away but u also dont want too much"travel" in the pedal.so about halfway is IDEAL. IMPORTANT- once the brake cable is adjusted and the car wont roll foward in gear with the brake on and applying a little "gas"-make sure with brake OFF that rear wheels turn freely. hope this helps.

There's speed sensors at each wheel. You may have got some contamination in front of one of them... sounds like the abs is trying to compensate for un equal speed at each wheel... and something may be blocking a proper read at one of the wheels...

1- brake system low on fluid,
2- improperly bled (air in lines).
3- Master cylinder (applies equal pressure to all 4 cylinders) is bad.

You may have a bad brake Booster and it could have brake fluid in it.
Also you may want to try a complete brake fluid flush.

Sounds like air in the fluid or low fluid level. Check the brake fluid level under the hood and make sure it's adequate. If not, top it off. If it is, have the brakes bled and the fluid topped off again, and you should be OK, as long as nothing was damaged during the recent brake job.

First you need to check the brakes lines and the brake pads must be replaced on your car they may be worn out........ Get it checked from the local service center........