how's it going everyone??? well here's the issue. when i start up my car and hit the brake pedal and depress, the master cylinder or brake booster makes a semi-sqeaking noise. im not sure if i have this problem when im on the road. i didnt notice a decrease in braking performance. do i have a problem with my master cylinder or brake booster??? thanks!!!!

 

visual inspection..look for leak in the bottem of the plastic tank, see if it's leaking, if so, the paint should be gone.

take off the dust boot on the wheel cylinder and check it out.

It could be the seal in the Master cylinder but i dont think they make noise before they die.

also do a booster test and see if the panel drift to the floor or not