i checked my brake fluid like 3 weeks ago and it was kinda low and i know i still dont need brakes so i just topped it off just to be safe..but i checked it today and it was right above the LOW line so i was like ok somethings wrong and i checked all of my lines no leaks at the mc prop valve or the bleeder valves and i made sure that they were tight...my question is what could be wrong? could my MC be leaking to the booster? and if so is there a way to check it?

 

Yes, master cylinders do leak internally. The o-rings/seals in mine completely took a **** to the point where I had no pedal. Drove it like that for about a week, too... Needless to say, not safe.

As for leaking into the booster, it will do that. Maybe pull the vacuum hose from the booster and look for evidence of brake fluid on the tip and in the hose... The vacuum would be pulling the fluid into the manifold.

 

ok cool...when u replaced it did u or do u have to replace both mc and booster or just mc?

 

Just the master cylinder. Bought a re-manufactured unit from CarQuest. Had to swap the reservoir over from the old one, bench bleed the new one, bolt it on, bleed the whole system, and you're ready to go.