ok guys, see if anyone can point me in a direction...

I went to a festival downtown last night. The weather was rainy, and it started to rain really hard again, so I went back to the car to head home before the streets flooded again.

I push the brake down and notice it goes considerbly farther down before it gets any pressure. And theres hardly any pressure at all when its way down low. The brakes seem to work, but I didn't try to lock them up or anything.

My first thought was that the master lost all the fluid.

I drove home engine braking as much as possible, and using the brakes only when absolutely neccessary.

When I got home, the master cylinder is still well above the min fill level, infact its only slightly below the max mark.

I didn't jack it up to check for brake fluid on the inside of the tires though.

What could have caused this?

(brakes were working fine before, entire brake system [less master and booster] is less than 4 months old.)

 

If the master cylinder is worn, you are loosing pressure
as the fluid is leaking past one or both pistons, but before condeming the master cylinder do a check of the complete system to check for any leakage.

 

do they just kinda stop working just like that? I didn't notice any fluid loss though...

 

Usually, when the master cylinder gives out the worn rubber from the piston cups gets into the fluid in the reservoir leaving a black sludge in the bottom.
That will confirm a bad master cylinder.

Same thing with the clutch master.

 

I went to rebleed and realised I didn't have the right rench oh well.
Master Cylinder. Yes, thers some black stff at the bottom, I dipped a screwdriver in it and swished. I don't know if its considered much or just dirt though...



And what is this? It was shoved in the master cylinder sideways (vertical). Looks broked whatever it is...

 

That brake fluid looks dirty as hell. I would go and get some new brake fluid and flush everything out.

That thing that looks broken i believe is the warning light for low brake fluid.
It should go in flat like a pancake, not vertically.

 

I sourced a mastercylinder rebuilt for $38+10 core in town (im suprised...). going to pick it up in a few minutes...