hi my 94 acura integra is having break issues it is not holding pressure i found no air in the lines after trying to bleed them and the system has no leaks what is the problem could the master cylinder be bad

 

if there's no air bubbles then another option could be that your brake booster is bad. go to les schwab and get a free brake inspection yo.

 

Did you bleed the ABS system?
Follow proper bleed order for all calipers?

If nothing else, is the master cylinder still good?

 

Test the booster by turning off your car.. pump the brakes till firm, hold it and turn on car.. if the pedal sinks a lil bit then your booster is fine.

Does your pedal sloowly sink to the floor when you're at a stop light or something? If so, it could be your MC.

 

usually, well from what iv always seen is that if your booster is bad the pedal will be extreamly hard/stiff.Like a car w/o power brakes. however its the complete opposite if its your master cylinder, the pedal will be really soft and not hold pressure if your master cyl. is bad.
douple check you bleed sequence and if that doesnt fix your problem your most likly looking at a master.

 

It probably is your master cylinder. If you pressed down on the breaks and the pressure holds for a little bit and then slowly sinks to the ground, then it is your master cylinder.