Pedal goes to the floor, hissing sound

Topic: Pedal goes to the floor, hissing sound (Read 9503 times) previous topic - next topic

Pedal goes to the floor, hissing sound

Reply #15 – June 11, 2007, 12:16:13 PM

I logged on this morning with the same problem.

I also get the hissing sound, the pedle goes straight to the floor, and no brakes. The m/c fliud level is fine. I didnt see any fliud on the ground, but I didnt check the inner tires or pull a wheel.

Seems like I should still have front brakes if the rears are bad.

Pedal goes to the floor, hissing sound

Reply #16 – June 11, 2007, 12:33:51 PM

K, first things to check when you get a hissing:

- Make sure the brake booster check valve (where the large vacuum line from the manifold attaches to the booster) is properly seated. It is designed so that you can have a slight attachment angle and still not leak...but double check it anyway. Might need pushed in, or replaced (it's a $5 HELP! part). Also, inspect the vacuum line for cracks.

- If your car was originally equipped with the automatic parking brake release option, you'll have a thin white vacuum line going from the B/R port on the vacuum tee under the hood, through a hole in the center of the firewall, and down to a white collar at the base of the steering column, near the brake pedal. Make sure that line is attached (or capped off), or that the line didn't break.

Otherwise you're more than likely looking at a new booster.

Pedal goes to the floor, hissing sound

Reply #17 – June 17, 2007, 12:15:00 PM

Quote from: EricCoolCats;153409

K, first things to check when you get a hissing:

- Make sure the brake booster check valve (where the large vacuum line from the manifold attaches to the booster) is properly seated. It is designed so that you can have a slight attachment angle and still not leak...but double check it anyway. Might need pushed in, or replaced (it's a $5 HELP! part). Also, inspect the vacuum line for cracks.

In the winter time, the check valve in my t-bird would freeze...after letting it idle for 10 minutes, I had power brakes again.

Pedal goes to the floor, hissing sound

Reply #18 – July 01, 2007, 04:31:15 PM

i have the same problem to but i figured that out where the hissing/ bubbling sound is coming from and its coming from the brake booster. so is it better to replace the master cylinder to at the same time or just replace the brake booster?