I have a 95 ES300 that i got a couple weeks ago. while driving it around, i've noticed that as im slowing to a stop the brake pedal feels like it looses pressure for a second then comes back up. the pads are good all around and brake fluid is up to max. where do i start?

 

clean the floor in ur garage. drive ur car for the day like normal and then park in the garage. pull it out in the morning and see if anything is leakin by lookin for spots on the floor. other than having a small leak i cant think of anything without actually driving the car for myself

 

Power brake booster is all I can think of if the fluid isn't obviously leaking. At 191k it's feasible. Did you check the the booster hose see if it's squishy or cracked? Don't ask me where it is lol I haven't done anything to the brakes on these cars yet.

 

the booster hose is good and under the car is clean. would air in the system cause this problem?

 

Air in the lines would be my guess if your not having a leak.

You'll have to bleed the lines. A rule of thumb is start with the wheel that's farthest from the master cylinder.

 

what i suspect is while you probably have some air in your brake hydraulic system, i suspect it is contaminated with water.

first you press brake, it works

then it gets hot

then water boils

the water quickly turns into gas

gas is compressible

pedal goes down a little as gas is compressed

then the pedal works decently again after the gas is compressed

you probably have water getting in the fluid near the calipers. i would flush out the brake fluid really good, especially the calipers. also, once the moisture content gets this high like yours, the caliper tends to rot out from the inside means your piston might freeze up etc.

 

i also forgot to mention there's a "clunk" sound that goes along with the brakes