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Old 07-26-2010, 03:42 PM   #1
Kubica
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Join Date: Apr 2008
Location: Boston
Posts: 4,384
My Ride: 2003 325xi
Brake Pedal on the Floor

Soooo . . .autox yesterday . . .car handled great except for one issue.

At the beginning of my 7th run (out of 8), at the first braking zone, my brake pedal went all the way to the floor, accompanied by one singular ABS type shudder. At the next braking zone, the pedal went back to normal and stayed that way for the rest of the day.

I run Performance Friction Z pads, new brembo/zimmerman rotors, braided SS lines, and SuperBlue fluid which was changed less than three months ago. It has one track day and 3 autox's on it. There are no leaks at the calipers and the fluid level stayed consistant before and after the event.

I remember this happening once before- but in a completely different scenario. Last winter I made an emergency stop before the car was fully up to temp and the pedal had a similar feel.

Thanks!
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Old 07-27-2010, 11:55 AM   #2
Kubica
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Am i looking at a new master cylinder?
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Old 07-27-2010, 12:25 PM   #3
badfast
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I would have thought there was a leak somewhere, but you said you were not losing fluid.

Have you tried bleeding the brakes?

When the pedal went to the floor did the car still make a good effort in stopping?

Could be the Master Cylinder...but for some odd reason I also have brake booster stuck in my head (don't know why).
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Old 07-27-2010, 03:30 PM   #4
Kubica
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Quote:
Originally Posted by badfast View Post
I would have thought there was a leak somewhere, but you said you were not losing fluid.

Have you tried bleeding the brakes?

When the pedal went to the floor did the car still make a good effort in stopping?

Could be the Master Cylinder...but for some odd reason I also have brake booster stuck in my head (don't know why).
Yes, i am planning to bleed the brakes again, but I doubt the fluid is the problem.

The car did slow sufficiently when I nailed the brakes to make the corner.

Only other thing I can think of is that the ABS doesn't seem to kick-on as much recently.
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