I dont know why, but my brake pedal goes all the way down, I just got fr rotors, brake pads, and it still does it. any ideas on what the problem is?

 

have u checked bmc? proportioning valve?

 

I have that problem also, my brake booster crapped out, new one is in the mail, :-)

 

figure out your problem...


heres the brake system test procedure:

FUNCTIONAL TEST
1. With the engine off, depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, a brake line, wheel cylinder, or the master cylinder is faulty.

2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or check valve is faulty.

LEAK TEST
1. Depress the brake pedal wit hthe engine running, then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty.

2. With the engine off, depress the brake pedal several times, using normal presure. When the pedeal is first depressed, it should be low. On consecutive applications, pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

CHECK VALVE TEST
1. Disconnect the brake booster vacuum hose at the booster.

2. Start the engine and let it idle. There should be vacuum available. If no vacuum is available, the check valve is not working correctly.
Replace the check valve and retest.

and if its just a mushy pedal, you need to bleed your brakes or master cylinder properly.