i press on the brakes and then if i leave my foot on pedal i lose pressure slowly. i put my car on a lift and had someone do the pedal pressing and i turned all 4 wheels then after its depressed for 5-10secs my friend tells me pressure islosing and the pedal is going down to the floor slowly and guess what my FRONT passenger side spins.

been happening for couple months since i changed rotor/pads drums/drumhardware/shoes. i bled the brake system 2 times. but the front passenger side is losing pressure. where to look? i cant be in traffic anymore and start coasting forward or back anymore after 5-10 secs.

 

if your losing brake fluid from the wheel area, its the brake pistons in the caliper. If not, it your master cylinder. check all brake lines,I mean all, make sure there on tight, check your wheel cylinders in your drums, are they leaking, check all hoses to your claipers/drums, are they cracked leaking, I had the same prob before, it was my master cylinder. Also, if you can, get your hands on a brake power kit(brake booster vacuum gauge) check the pressure. i cant post pics as i dont know how, but i can e mail you a pdf file with directions from the chiltons guide.

 

the reason why i did all my brakes together at once was because my rear wheel cylinder blew and fluid was everywhere in the back. they blew under braking and i couldnt stop at a red light and no brakes for 35 miles til i reach my garage.

i changed both rear cylinders, drum, drum hardware, shoes, rotors, pads and fluid. bled system 2 times.

no oil anywhere on my car or break system. just a slow leak. i can stop perfectly fine. and autocross. lol just not good for Dailydriving

 

i think all that pressure might of blown some **** in the master cyliner. Theres a bunch of seals and other stuff inside those master cylinders that help against back pressure. There is also a piston inside the brake booster. get the booster pressure checked. Change master cylinder to, Its not electrical, so take it back if its not the prob. Tell them they gave you the wrong part and now your never coming back

 

check your passenger side flexible brake line. Could be swelling up. I would just change it. Otherwise look at the seal around the caliper piston.