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Brake pedal occasionally goes to the floor

 
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gwb1968
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PostPosted: Wed Dec 21, 2011 10:58 am    Post subject:  Brake pedal occasionally goes to the floor Reply with quote

Recently my 04 Impala has had a problem with the brake pedal occasionally going close to the floor. It usually happens when it's cold outside. Twice it has happened in the driveway before leaving, but a couple of times shortly after leaving home or work. One pump of the pedal and everything's back to normal. I don't see any leaks, master cylinder is full, brakes are newer, (fluid could use changing). I have a couple of ideas, but I would rather see what others think. Any insight would be appreciated.
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IffyG
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PostPosted: Wed Dec 21, 2011 12:07 pm    Post subject:   Reply with quote

I think brake problems of this nature are serious and should probably be addressed by a mechanic who can actually manipulate the car. If it were me, I'd give it a once over myself and then have it towed to a mechanic. The last thing you need is the brakes going out while you are driving.

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PostPosted: Wed Dec 21, 2011 4:39 pm    Post subject:   Reply with quote

could be your booster. i had one fail on me and that is what happen to me

Alan

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davidhoutz
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PostPosted: Thu Dec 22, 2011 9:12 am    Post subject:   Reply with quote

When I start up, I have my foot on the brake. When the car starts, if I was to keep pushing the pedal, it would go down further. Once I let go its all back to normal. Is this what your doing? Or is your pedal "bottoming out" the first time you try to brake?
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Lingenfelter
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PostPosted: Thu Dec 22, 2011 1:20 pm    Post subject:   Reply with quote

I thought soft pedal indicated air in the system.

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351man
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PostPosted: Thu Dec 22, 2011 2:51 pm    Post subject:   Reply with quote

You probably are having a master cylinder problem.
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98ss
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PostPosted: Thu Dec 22, 2011 3:00 pm    Post subject:   Reply with quote

351man wrote:
You probably are having a master cylinder problem.

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gwb1968
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PostPosted: Thu Dec 22, 2011 3:07 pm    Post subject:   Reply with quote

I'm going to try to respond to these in order. First I do have an appointment next week to get this looked at. As far the booster goes, would that cause this problem intermittently, and how much was it to repair? Next the pedal does bottom out immediately (on occasion) also it has happened within the first few miles of driving. The pedal is not normally "soft" just on the rare occasion when this happens. If there were air in the lines, would this not occur all the time? Lastly my first suspicion was the master cylinder but if that were the case would this not be a constant problem? Thanks again for all the responses.
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topgun
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PostPosted: Thu Dec 22, 2011 7:34 pm    Post subject:  brake problems Reply with quote

my money is on a brake booster problem. Cool

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PostPosted: Fri Dec 30, 2011 10:12 am    Post subject:   Reply with quote

Look around the booster has any rust or brake fluid trails. See if the vacuum hose is leaking.. start the engine and listen for air leaks.

With the engine off.
Unbolt the master cylinder and pull it forward.. Not much just a bit to see if there is any fluid leaking from the rear of the master cylinder.

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gopedxr7
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PostPosted: Fri Dec 30, 2011 11:32 am    Post subject:   Reply with quote

if its the booster you may hear a hissing sound when you have the problem. also you can use a vacuum pump to test it. remove the hose going to the engine, plug in the vacuum pump, start pumping and if its not holding vacuum it could be bad. you can pick one up at harbor freight if you dont have one

http://www.harborfreight.com/b.....92474.html

and you can use it to bleed your brakes if you have never done so already

Alan

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gwb1968
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PostPosted: Sat Dec 31, 2011 9:31 am    Post subject:   Reply with quote

Just got the car back yesterday and it was a defective master cylinder. I thank everyone who took the time to weigh in.
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