Spongy brakes after brake job

Discussion in 'General Motoring' started by Joe, May 22, 2006.

  1. Joe

    Joe Guest

    I have a 2005 Crysler Town and Country - 4-wheel disc brakes. I just
    replaced the front discs and rotors (new rotors - not turned). The new
    disc pads are Morse ceramics (to avoid brake dust). After changing the
    pads, the brake pedal is very spongy and is only normal after pumping
    it a few times.

    I don't know how it would have happened, but could air have gotten into
    the system somehow? In order to install the new brake pads, I pushed
    the calipers to their original positions to accomodate the new, thicker
    pads. I can't see how air would have gotten into the system though.

    Any other thoughts? Comments?
     
    Joe, May 22, 2006
    #1
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  2. Joe Pfeiffer

    Joe Pfeiffer Guest

    "Joe" <> writes:

    > I have a 2005 Crysler Town and Country - 4-wheel disc brakes. I just
    > replaced the front discs and rotors (new rotors - not turned). The new
    > disc pads are Morse ceramics (to avoid brake dust). After changing the
    > pads, the brake pedal is very spongy and is only normal after pumping
    > it a few times.
    >
    > I don't know how it would have happened, but could air have gotten into
    > the system somehow? In order to install the new brake pads, I pushed
    > the calipers to their original positions to accomodate the new, thicker
    > pads. I can't see how air would have gotten into the system though.


    I can't think how that could have gotten air in the system, but your
    symptoms are certainly consistent with that having happened. You
    might look for leaks -- maybe overstressed a brake line while doing
    the change?
    --
    Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605
    Department of Computer Science FAX -- (505) 646-1002
    New Mexico State University http://www.cs.nmsu.edu/~pfeiffer
     
    Joe Pfeiffer, May 22, 2006
    #2
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  3. Guest

    When you pressed the calipers open, where did the displaced brake fluid
    go? Did the resevoir overflow or leak? Are there drips under the car
    or around the calipers?

    Sometimes new rotors need to be cleaned more than you think. There is
    alot of oil on the rotors to keep them shiny in the package. Oily
    rotors contaminate the pads and require alot of pressure to stop the
    car.
     
    , May 22, 2006
    #3
  4. Coasty

    Coasty Guest

    Diddo on the rotors I did a break job on the Ram this weekend and before
    installing the rotors I wiped them down with Xolene.
    Coasty

    <> wrote in message
    news:...
    > When you pressed the calipers open, where did the displaced brake fluid
    > go? Did the resevoir overflow or leak? Are there drips under the car
    > or around the calipers?
    >
    > Sometimes new rotors need to be cleaned more than you think. There is
    > alot of oil on the rotors to keep them shiny in the package. Oily
    > rotors contaminate the pads and require alot of pressure to stop the
    > car.
    >
     
    Coasty, May 22, 2006
    #4
  5. philthy

    philthy Guest

    did u get the pads seated correctly in the calipers ???
    did u clean and lube the slides for the calipers??
    im seeing alot of complaints about those pads and replacing them with
    stardard pads to match the rotors

    Joe wrote:

    > I have a 2005 Crysler Town and Country - 4-wheel disc brakes. I just
    > replaced the front discs and rotors (new rotors - not turned). The new
    > disc pads are Morse ceramics (to avoid brake dust). After changing the
    > pads, the brake pedal is very spongy and is only normal after pumping
    > it a few times.
    >
    > I don't know how it would have happened, but could air have gotten into
    > the system somehow? In order to install the new brake pads, I pushed
    > the calipers to their original positions to accomodate the new, thicker
    > pads. I can't see how air would have gotten into the system though.
    >
    > Any other thoughts? Comments?
     
    philthy, May 23, 2006
    #5
  6. "Joe" <> wrote in message
    news:...
    > I have a 2005 Crysler Town and Country - 4-wheel disc brakes. I just
    > replaced the front discs and rotors (new rotors - not turned). The new
    > disc pads are Morse ceramics (to avoid brake dust). After changing the
    > pads, the brake pedal is very spongy and is only normal after pumping
    > it a few times.
    >
    > I don't know how it would have happened, but could air have gotten into
    > the system somehow? In order to install the new brake pads, I pushed
    > the calipers to their original positions to accomodate the new, thicker
    > pads. I can't see how air would have gotten into the system though.
    >
    > Any other thoughts? Comments?
    >


    Sometimes what happens with calipers is the part of the piston that is
    extended
    out from the caliper gets a bit of corrosion on it. Then when you put new
    pads on and push the piston back into the caliper, this area of corrosion
    (which
    has a bit of pitting) will end up right on the caliper seal, causing a small
    leak.
    Once that happens as the brake moves around it will suck air into the
    caliper.

    This is only a year old vehicle so all of this is unlikely - unless you like
    driving
    around in streams or flooded roads or some such - but you can check for
    brake
    fluid seepage around the caliper piston seal. Top priority of course is a
    complete
    bleed of the system to see if that fixes the problem. If it does then you
    definitely
    had air in the system. If the problem comes back then you definitely have a
    leak
    in the hydraulic system somewhere and you will need to start looking for it.

    Ted
     
    Ted Mittelstaedt, May 24, 2006
    #6
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