Replacing brake fluid (Peugeot 307)

Brake fluid should not come into contact with mineral oils. Even a small amount of mineral oil makes the brake fluid unsuitable for use in the brake system.

Replace the brake fluid for each branch of the hydraulic circuit in the following order:

front left wheel;
front right wheel;
rear left wheel;
rear right wheel.

Caution! Brake fluid is hygroscopic (absorbs moisture from the air), therefore, it is not recommended to use liquid that has been stored in an open container for a long time. Use only fresh DOT 4 brake fluid.

To replace brake fluid:

remove the cap from the brake fluid expansion tank;
use a syringe to partially pump out the brake fluid from the reservoir;
fill the expansion tank with fresh brake fluid to prevent air from entering the brake system from the reservoir. Make sure that the brake fluid level in the reservoir is not below the "Min" mark during the procedure;
remove the dust cap from the front left caliper bleeder nipple, clean it and attach one end of a clean transparent hose to it, lower the other end into a container partially filled with brake fluid. The container must be located at least 300 mm above the bleed nipple. This prevents air from entering the caliper through the bleeder nipple thread;
press the brake pedal sharply 3-5 times with an interval of 2-3 seconds, unscrew the bleed screw half a turn while keeping the pedal pressed. While continuing to press the pedal, force the old brake fluid in the circuit through the hose into the container. Once the pedal reaches its extreme forward position and the fluid stops flowing out through the hose, tighten the bleed screw all the way. Release the brake pedal and let it return to its original position on its own;
repeat these operations until fresh brake fluid comes out of the bleeder nipple;
while holding the pedal down, tighten the bleed screw until it stops and remove the hose;
wipe the bleed nipple and install the protective cap;