Serious Brakes Issue

bhai car koon c hay ? model kia hay ? Secondly get the genuine disc pads problem will be rectified smoke was coming out coz the pads got heated up.

it's Coure.ok i have Coure too.I tell you the problem.but i have a question,when come down from the hill ,,,,you are using you gear to reduce the speed or only breaks?your engine was start or you off the engine?
So for safe driving always in hilli area when you come down from hill reduce the speed by using low gear.and never ever switch off the engine.
Coure is nice car having boster breaks.
open you can bonet and you can see that break master cylinder in the car is not directly bolted to body but the boster.now that boster breaks only work when engine is in starting condition.when you switch off the engine the breaks become so hard seems very less working.
Boster has a pipe connected to car exast manifuel.if that pipe damage or leak the boster break never works and some time the break seems ok but during driving suddenly fail.
if break suddenly fail press again the padel and it will work.
ok now you need to change the pipe or may be your need to replace the boster.
normally the boster come with the master cylinder and buy it new or kabli with master cylinder.
the pipe also has a non return valve also check that.
it cost you arround 1500 to 2000 boster break with master cylinder.
ok you can ask toyota for new booster.
SO i tell you in steps
1- tell mechanic to check boster breaks pipe and it's non return valve.
2- check the breaks becom soft after starting the engine or not.
3-tell the mechanic to make booster breaks out of the car,and see if break oil is going in side the booster breaks or not.
4-seperate the master cylinder and he will check if master cyclinder need to replace the washels.the new kit is avalible in market for that.
5-observe if some break oil reduce but no leakage was shown.the oil go inside the booster.remove all oil from booster and change washel of master cylinder only.
6-The adjustment at back wheel put not very tight.just on point relax.
7-If some one say just remove the booster forever don't listen to him..because booster give the break a very longer life..