So it would seem the problem remained after the change. Hmmm... I expect
you have checked for leakage so we can bypass tube replacement and such.
I found that any time I had a soft pedal, flushing the system usually fixed
it. It is the same as bleeding the brakes, just more of it. Bleeding works
best with a helper unless you have a machine to help. Always do the
furthest wheel first. On this car, I would do the right rear, then left
rear. Right front, then the left front. Be sure the fluid doesn't get low
in the master cyl. I think I mentioned earlier, I invert a fresh bottle of
DOT3 in the proper chamber before starting.
I had a car not too long ago that had frozen rear pistons. It was drum
brakes on the rear and a new assembly for each side was quite cheap. That
made a huge difference in stopping but the pedal never went soft or hit the
floor.
I am running out of ideas here - I think better when I am staring at the
machine in question - . Bleed / flush the brake lines would be the next
step for me...
PoD
"Robert Q. Bailey" <rqb2001@hotmail.com> wrote in message
news:42a03b9a$1_4@spool9-east.superfeed.net...
> The reason for the original change was the brake pedal started all of a
> sudden going to the floor. I also repleced the front pads because it was
> near that time.
> "Paul of Dayton" <F_and_P@NOSPAMameritech.net> wrote in message
> news:DYKne.9450$4u.4644@newssvr33.news.prodigy.com...
>> If you didn't bleed the brakes until bubbles and clean fluid came out
>> after the master cyl. change, air is a good suspect. I hope you are
>> using some type of service manual for the work. It should tell you the
>> proper way to bleed brakes. I always invert a fresh bottle of fluid in
>> the master cyl. and then bleed the right rear first. I used to flush
>> brakes every coulpe of years to be sure moisture isn't a problem.
>>
>> A "whoosh" when hitting the brakes is normal, there is a rubber bellows
>> on the lever at the firewall. The vacuum side of things is under the
>> hood. Even if the brake booster had no vacuum, the pedal wouldn't go to
>> the floor. It would be very hard to puch right from the start but it
>> would be solid.
>>
>> What led you to replace the master cyl. to begin with?
>>
>> PoD
>>
>> "Robert Q. Bailey" <rqb2001@hotmail.com> wrote in message
>> news:429f6afc_1@spool9-east.superfeed.net...
>>> having problems with my brakes. The pedal goes down to the floor and the
>>> car is very hard to stop. I replaced the master cylinder and still the
>>> same thing. I'm wondering if the vacuum booster is going bad due to the
>>> fact that I sometimes hear which sounds like air coming from behind the
>>> dashboard when applying brakes. I checked the line itself, the engine
>>> speed decreases when I put my finger over the hose. I'm also wondering
>>> if it might still be some air in the brake lines?
>>>
>>>
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>
>
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