Persistant Brake Issues - Loren / Tool Pants PLS READ

[insite]

about a year and a half ago, i got a brake pad retainer spring caught between two pads when i changed the pads. it took me a couple of days to find the issue. in the meantime, there was much mashing of pedal during the diagnosis. ever since then, my brakes have never felt right. i can stop the car fine, but it requires much higher than normal pedal pressure, especially when cold.

initially, i attributed this to pads / rotors since i'd been to the track recently. i now have tried 3 brands of pads and have all new rotors. bled brakes w/ power bleeder. problem still exists.

then i thought maybe i trashed a master cylinder seal pressing the pedal so hard diagnosing the first problem. i now have a new master cylinder. bled brakes w/ power bleeder. problem still exists.

then it was on to brake lines. since i was hard on the pedal and the car is getting older, i thought maybe my lines are ballooning. replaced w/ SS lines. no improvement.

i'm now leaning towards a brake booster issue. i have found two TSB's w/ different dates (4770 @ March 8, 02 and March 30, 01). problem is, theyare listed, but not available, in the TSB section. they appear to apply to 1998 models. i have a '99 that was manufactured in '98, so maybe it applies? does anyone know what these TSB's say?

anyone ever have a brake booster fail? i'm also open to other possibilities here. this is driving me nuts. if the booster fails, it should be leaking, right? if that's the case, i can probably check w/ propane or such, no? any ideas are appreciated. thanks.

note: the car does not pull to either side under braking; it brakes straight.

[Tool Pants]

The only TSB I remember had to do with replacing the booster on older cars because Porsche had changed parts.

Don't know what is going on with your car since you replaced about everything.

But take a look at this.

http://www.pca.org/tech/tech_qa_question.a...D-7F0EF9486935}

[insite]

The only TSB I remember had to do with replacing the booster on older cars because Porsche had changed parts.

Don't know what is going on with your car since you replaced about everything.

But take a look at this.

http://www.pca.org/tech/tech_qa_question.a...D-7F0EF9486935}

thanks. i checked the booster for fluid or water. nada. i think the check valve is ok since my car retains vacuum overnight while the switch is off. wow. this is really bugging me. i'm hoping maybe there's just still a bit of air in the system after changing the master cylinder.