best way is to suck out master cylinder and refill to top with fresh Fluid then start with brake cylinder furthest away from master cylinder with length of clear pipe which has a tight fit on nipple 6 or 7 mm inside diameter and a container with some Fluid in it make sure pipe is in fluid all the time ,open nipple 10 or 11 mm spanner then get some one to pump pedal down and up slowly you should get about 500 ml or 1/2 litre from each cylinder when you think you have then as they push pedal down hold it there nip up nipple raise pedal loosen nipple and get them to push down again as i say 3 or 4 times should be ok when down tighten nipple and done repeat until you get to closest cylinder to master cylinder MAKE SURE MASTER CYLINDER IS TOPPED UP ALL THE TIME WHILST BLEEDING BRAKES
you can buy one man bleeding tool its about 拢 15 which has a valve in it and helps not get any air back in to system
2 litres of DOT 4 should be plenty to clear system brake fluid should be changed every 4 years on your car.
BUT IF UNSURE GET GARAGE TO DO THEY SHOULD ONLY CHARGE YOU 拢 40 TO 拢 70 TO DOOn a renault laguna how do i change the brake fluid?
The only way is to bleed all the fluid out through a bleed nipple on one of the brakes,then to bleed the fluid in the pipes by bleeding all the others.
