Maybe someone here can help and i'm almost positive it is a vaccume problem. My break petal sometimes bottums out at the floor and the car is still rolling. If I'm correct when i stump on the breaks, the front tires should lock right up? Most of the times it does that, but tonight it went to the floor, i mean it was slowing me down but kinda scary when your foot is on the floor and your still rolling What could it be? Thanks

 

air in the lines, or possible a collapsed line, replace all the brake lines and bleed them just to be safe

 

The rear lines are all new, and the front are still good, i think i will bleed them again and see what happens i know i did a good job when i bled them. I thought maybe vaccume because if i stay on the breaks going down a long hill then break hard it does it again. What ya think? Thanks

 

yeah if it was vaccuum releated, the brakes would be really hard to push. And even if you somehow got "superman-vacuum", the pedal might go to the floor (in "TomP is tired as hell at 1AM" thinking), but you'd still stop on a dime.

I agree 100% with Kretos; you might've gotten air in the master cylinder and it'll be a bitch to get out. If you've got the coin, check out http://www.brakebleeder.com ; but you can get a better price at http://www.toolparadise.com (in their search box on the right of the screen, type in "V12").

The key point is that you said when you brake for a while, then let up, then brake again, the brake work great. You're "extra compressing" the air and that's why the brakes work good.

So yeah you gotta re-bleed, specifically at the master cylinder- bench bleed that first, then re-bleed the whole damn system. I hate brake fluid, but since I bought the V12 (w/smart pak and m/c kit), it almost (almost!) becomes tolerable!

You could also get a Mityvac; they're about $30 and available locally. But they work on suction and connect to the bleeder screws, as opposed to the V12 which works on pressure and goes straight to the master cylinder, just like a GM dealer's equipment. (V12 can also do suction too but why bother?)

 

You might have a bad master cylinder that's leaking internally.

 

I 2nd that - leaking master cylinder.

If you pump the brakes, does it get nice and hard again?

 

It takes a while for it to get hard but then it does and the pedal bottums out after bumping the brakes? Whats this mean?

 

That means it's a textbook example of a leaking master cylinder?

 

What do i do in this case

 

Gonna go on a limb here..



replace it....

 

I know that LOL, but i was wondering if there is another way to fix it without replacing it. Someone was saying maybe there is just air in it? Thanks

 

its shot..

been there, its easy to replace, get a little vacuum pump, replace the master cylinder then go to each brake and suck fluid through until there is no more bubbles, make sure the resevoir doesnt empty while your bleeding it.

 

for everyones safety, especially yours, get yourself a new one, worth the money and not worth the hassle of killing someone if you can't get the air out.

just my 2 cents