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Discuss Subaru Brake Squeal in the alt.autos.subaru forum at Car Dealer Forums; Well, I've read up a lot on this subject and I'm getting mixed answers: I ...
  1. #1
    webstericehockey@gmail.com
    Guest

    Default Subaru Brake Squeal

    Well, I've read up a lot on this subject and I'm getting mixed answers:

    I have a 1995 Subaru Legacy Wagon with 4 Wheel Drive and ABS. A month
    ago, the left disk brake brake started squealing. Its a really high
    pitch squeal and only occurs when my foot is off the brake and occurs
    regardless of speed (Ive had it squeal anywhere from low speed to
    highway speed driving). When I apply the brake, the sound goes away.
    Likewise, when i turn the wheel left or right, the squeal gets softer
    or louder. Also, the squeal occurs randomly (drive to costco no
    squealing but on the way back squealed badly). The squeal also
    increases as the speed increases; say from 0-20 mph
    squeak-squeak-squeak and at 40mph just sounds like one constant loud,
    high pitched squeal.

    Here's the maintenance Ive done:
    -Brand new master cylinder, new brake rotor, new brake pads, and a new
    brake caliper (all remanufactured)
    -Applied disk brake anti-rattle but brakes still squealed, took wheel
    off to inspect and noticed that the anti-rattle compound had gotten
    onto the anti-rattle spring (anti-rattle is really sticky stuff), so I
    completely cleaned off the pad and anti-rattle springs w/ denatured
    alcohol and applied high-temp silicon brake lubricant on anti-rattle
    spring (the part where the pad moves in and out) , but the squeal
    actually got worse.

    Here are a few things I've heard that solve this problem, but need
    verification, please:
    -Bad or failing hub bearing (I read that this makes more of a grinding
    noise, not squealing)
    -Dust cover/plate on back of rotor (Ive checked for contact, but I dont
    see any)


    As you can see, ive spent a lot of unnecessary time and money on this
    project, and at this point have run out of ideas. ANY help or comments
    would help TREMENDOUSLY. Thanks.




    › See More: Subaru Brake Squeal

  2. #2
    Carl 1 Lucky Texan
    Guest

    Default Re: Subaru Brake Squeal

    webstericehockey@gmail.com wrote:

    > Well, I've read up a lot on this subject and I'm getting mixed answers:
    >
    > I have a 1995 Subaru Legacy Wagon with 4 Wheel Drive and ABS. A month
    > ago, the left disk brake brake started squealing. Its a really high
    > pitch squeal and only occurs when my foot is off the brake and occurs
    > regardless of speed (Ive had it squeal anywhere from low speed to
    > highway speed driving). When I apply the brake, the sound goes away.
    > Likewise, when i turn the wheel left or right, the squeal gets softer
    > or louder. Also, the squeal occurs randomly (drive to costco no
    > squealing but on the way back squealed badly). The squeal also
    > increases as the speed increases; say from 0-20 mph
    > squeak-squeak-squeak and at 40mph just sounds like one constant loud,
    > high pitched squeal.
    >
    > Here's the maintenance Ive done:
    > -Brand new master cylinder, new brake rotor, new brake pads, and a new
    > brake caliper (all remanufactured)
    > -Applied disk brake anti-rattle but brakes still squealed, took wheel
    > off to inspect and noticed that the anti-rattle compound had gotten
    > onto the anti-rattle spring (anti-rattle is really sticky stuff), so I
    > completely cleaned off the pad and anti-rattle springs w/ denatured
    > alcohol and applied high-temp silicon brake lubricant on anti-rattle
    > spring (the part where the pad moves in and out) , but the squeal
    > actually got worse.
    >
    > Here are a few things I've heard that solve this problem, but need
    > verification, please:
    > -Bad or failing hub bearing (I read that this makes more of a grinding
    > noise, not squealing)
    > -Dust cover/plate on back of rotor (Ive checked for contact, but I dont
    > see any)
    >
    >
    > As you can see, ive spent a lot of unnecessary time and money on this
    > project, and at this point have run out of ideas. ANY help or comments
    > would help TREMENDOUSLY. Thanks.
    >


    Does it change much with sweeping turns left or right? Also, is the
    temperature of one hub hotter than it's companion? You should also try
    to SAFELY have someone pace the car, on foot or bicycle, in a parking
    lot to see if they can hear anything from outside the car.

    Carl


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    to reply, change ( .not) to ( .net)

  3. #3
    webstericehockey@gmail.com
    Guest

    Default Re: Subaru Brake Squeal


    Carl 1 Lucky Texan wrote:

    > Does it change much with sweeping turns left or right? Also, is the
    > temperature of one hub hotter than it's companion? You should also try
    > to SAFELY have someone pace the car, on foot or bicycle, in a parking
    > lot to see if they can hear anything from outside the car.
    >
    > Carl


    Yes, it does change with sweeping turns. Im not sure it the hub temp
    issue, but i noticed an uneven wear pattern on the left disk brake with
    NEW rotor and pads and OLD caliper.

    the NEW caliper fixed the rotor wear pattern, but the squealing
    persists.

    as for the sound, it can definately be heard with the windows down
    inside the car. It's so annoying, loud, and high pitched (imagine a lot
    crickets chirping simultaneously)

    thanks for the input Carl.


  4. #4
    Vanguard
    Guest

    Default Re: Subaru Brake Squeal

    <webstericehockey@gmail.com> wrote in message
    news:1157244152.866720.90780@h48g2000cwc.googlegro ups.com...
    > Well, I've read up a lot on this subject and I'm getting mixed
    > answers:
    >
    > I have a 1995 Subaru Legacy Wagon with 4 Wheel Drive and ABS. A
    > month
    > ago, the left disk brake brake started squealing. Its a really high
    > pitch squeal and only occurs when my foot is off the brake and
    > occurs
    > regardless of speed (Ive had it squeal anywhere from low speed to
    > highway speed driving). When I apply the brake, the sound goes away.
    > Likewise, when i turn the wheel left or right, the squeal gets
    > softer
    > or louder. Also, the squeal occurs randomly (drive to costco no
    > squealing but on the way back squealed badly). The squeal also
    > increases as the speed increases; say from 0-20 mph
    > squeak-squeak-squeak and at 40mph just sounds like one constant
    > loud,
    > high pitched squeal.
    >
    > Here's the maintenance Ive done:
    > -Brand new master cylinder, new brake rotor, new brake pads, and a
    > new
    > brake caliper (all remanufactured)
    > -Applied disk brake anti-rattle but brakes still squealed, took
    > wheel
    > off to inspect and noticed that the anti-rattle compound had gotten
    > onto the anti-rattle spring (anti-rattle is really sticky stuff), so
    > I
    > completely cleaned off the pad and anti-rattle springs w/ denatured
    > alcohol and applied high-temp silicon brake lubricant on anti-rattle
    > spring (the part where the pad moves in and out) , but the squeal
    > actually got worse.
    >
    > Here are a few things I've heard that solve this problem, but need
    > verification, please:
    > -Bad or failing hub bearing (I read that this makes more of a
    > grinding
    > noise, not squealing)
    > -Dust cover/plate on back of rotor (Ive checked for contact, but I
    > dont
    > see any)
    >
    >
    > As you can see, ive spent a lot of unnecessary time and money on
    > this
    > project, and at this point have run out of ideas. ANY help or
    > comments
    > would help TREMENDOUSLY. Thanks.
    >



    Could be the caliber piston isn't getting pushed all the way back.
    That is, you release the brake pedal but the piston doesn't move all
    the way back so the pads are still slightly riding on the rotor.
    Could be rust on the piston, the seal on it that's gotten stiff with
    age, or rust on the sliding pin so the caliber doesn't slide on that
    side so the pads are at a slight angle and might be riding the rotor
    (I've got that now and will have to see if I can clean it or have to
    replace with a rebuilt caliber). My mom's Subie had the squeal when
    the pedal was released which the shop didn't find the first time until
    I got the guy to ride in the car so I show exactly under what
    condition the squeal occurred in a big empty parking lot. They then
    found a pebble stuck in the pad.


  5. #5
    Blair Baucom
    Guest

    Default Re: Subaru Brake Squeal

    Also delamination of the brake hose can cause the piston not to return.

    Blair

    "Vanguard" <vanguard.news@yahooNIX.com> wrote in message
    news:baydneDNPeqXpWfZnZ2dnUVZ_qGdnZ2d@comcast.com. ..
    > <webstericehockey@gmail.com> wrote in message
    > news:1157244152.866720.90780@h48g2000cwc.googlegro ups.com...
    >> Well, I've read up a lot on this subject and I'm getting mixed answers:
    >>
    >> I have a 1995 Subaru Legacy Wagon with 4 Wheel Drive and ABS. A month
    >> ago, the left disk brake brake started squealing. Its a really high
    >> pitch squeal and only occurs when my foot is off the brake and occurs
    >> regardless of speed (Ive had it squeal anywhere from low speed to
    >> highway speed driving). When I apply the brake, the sound goes away.
    >> Likewise, when i turn the wheel left or right, the squeal gets softer
    >> or louder. Also, the squeal occurs randomly (drive to costco no
    >> squealing but on the way back squealed badly). The squeal also
    >> increases as the speed increases; say from 0-20 mph
    >> squeak-squeak-squeak and at 40mph just sounds like one constant loud,
    >> high pitched squeal.
    >>
    >> Here's the maintenance Ive done:
    >> -Brand new master cylinder, new brake rotor, new brake pads, and a new
    >> brake caliper (all remanufactured)
    >> -Applied disk brake anti-rattle but brakes still squealed, took wheel
    >> off to inspect and noticed that the anti-rattle compound had gotten
    >> onto the anti-rattle spring (anti-rattle is really sticky stuff), so I
    >> completely cleaned off the pad and anti-rattle springs w/ denatured
    >> alcohol and applied high-temp silicon brake lubricant on anti-rattle
    >> spring (the part where the pad moves in and out) , but the squeal
    >> actually got worse.
    >>
    >> Here are a few things I've heard that solve this problem, but need
    >> verification, please:
    >> -Bad or failing hub bearing (I read that this makes more of a grinding
    >> noise, not squealing)
    >> -Dust cover/plate on back of rotor (Ive checked for contact, but I dont
    >> see any)
    >>
    >>
    >> As you can see, ive spent a lot of unnecessary time and money on this
    >> project, and at this point have run out of ideas. ANY help or comments
    >> would help TREMENDOUSLY. Thanks.
    >>

    >
    >
    > Could be the caliber piston isn't getting pushed all the way back. That
    > is, you release the brake pedal but the piston doesn't move all the way
    > back so the pads are still slightly riding on the rotor. Could be rust on
    > the piston, the seal on it that's gotten stiff with age, or rust on the
    > sliding pin so the caliber doesn't slide on that side so the pads are at a
    > slight angle and might be riding the rotor (I've got that now and will
    > have to see if I can clean it or have to replace with a rebuilt caliber).
    > My mom's Subie had the squeal when the pedal was released which the shop
    > didn't find the first time until I got the guy to ride in the car so I
    > show exactly under what condition the squeal occurred in a big empty
    > parking lot. They then found a pebble stuck in the pad.




  6. #6
    Carl 1 Lucky Texan
    Guest

    Default Re: Subaru Brake Squeal

    webstericehockey@gmail.com wrote:
    > Carl 1 Lucky Texan wrote:
    >
    >
    >>Does it change much with sweeping turns left or right? Also, is the
    >>temperature of one hub hotter than it's companion? You should also try
    >>to SAFELY have someone pace the car, on foot or bicycle, in a parking
    >>lot to see if they can hear anything from outside the car.
    >>
    >>Carl

    >
    >
    > Yes, it does change with sweeping turns. Im not sure it the hub temp
    > issue, but i noticed an uneven wear pattern on the left disk brake with
    > NEW rotor and pads and OLD caliper.
    >
    > the NEW caliper fixed the rotor wear pattern, but the squealing
    > persists.
    >
    > as for the sound, it can definately be heard with the windows down
    > inside the car. It's so annoying, loud, and high pitched (imagine a lot
    > crickets chirping simultaneously)
    >
    > thanks for the input Carl.
    >

    Although the sound is odd for a bearing, one characteristic of wheel
    bearing failure is the change in sound in turns. If the sound is worse
    on right turns, the left side bearing will be more heavily loaded from
    body roll and will sound worse/louder. Obviously left turns more
    severely load the right side.
    Sticking caliper on the pins OR sticking piston might show very unequal
    wear between inner and outer pad (inner heavily worn) as well as higher
    wheel temp after extended driving.
    I have also experienced a loud squeal in the past from a pebble stuck
    behind the backing plate on a Datsun.

    Carl


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  7. #7
    webstericehockey@gmail.com
    Guest

    Default Re: Subaru Brake Squeal

    Vanguard- Thanks for the advice, but I stated above that I replaced the
    old caliper with a remanufactured caliper and the squealing persists.
    Likewise, there is anti-rattle compound (really sticky stuff) on the
    back of the pad so that the pad is literally "attached" to the new
    caliper piston.

    Blair- Delaminated brake hose? Can you explain?

    Carl- When I assesed this problem for the first time, I went in there
    to replace a Constant Velocity Joint. I did not notice any debris on
    the dust pan, but afterwards, the dustpan was contacting the rotor just
    a little bit and was blatantly obvious, so I bent the dustpan back so
    there was no more contact. and yet the squealing is still there. Thanks
    again Carl.

    Obviously, the high pitched squeal is caused by the brake pad touching
    ever so slightly on the rotor, meaning that something is not releasing
    properly. This does not make sense, however, because the whole assembly
    is floating (rotors, brakes). Yet, I cant fathom why a bad wheel
    bearing would make a extremely high pitched noise.


  8. #8
    Blair Baucom
    Guest

    Default Re: Subaru Brake Squeal

    Over in the Ford truck group it was discussed that sometimes the brake lines
    to a single wheel would delaminate inside and would act as a check valve
    allowing brake fluid to flow out to the caliper and when pressure was
    released the fluid would maintain pressure not allowing the caliper to
    release causing the brake to squeak.

    You can search alt.trucks.ford

    Not a common occurrence, but it looks like you have exhausted all of the
    more common ones.

    Blair

    <webstericehockey@gmail.com> wrote in message
    news:1157287169.598395.50850@i3g2000cwc.googlegrou ps.com...
    > Vanguard- Thanks for the advice, but I stated above that I replaced the
    > old caliper with a remanufactured caliper and the squealing persists.
    > Likewise, there is anti-rattle compound (really sticky stuff) on the
    > back of the pad so that the pad is literally "attached" to the new
    > caliper piston.
    >
    > Blair- Delaminated brake hose? Can you explain?
    >
    > Carl- When I assesed this problem for the first time, I went in there
    > to replace a Constant Velocity Joint. I did not notice any debris on
    > the dust pan, but afterwards, the dustpan was contacting the rotor just
    > a little bit and was blatantly obvious, so I bent the dustpan back so
    > there was no more contact. and yet the squealing is still there. Thanks
    > again Carl.
    >
    > Obviously, the high pitched squeal is caused by the brake pad touching
    > ever so slightly on the rotor, meaning that something is not releasing
    > properly. This does not make sense, however, because the whole assembly
    > is floating (rotors, brakes). Yet, I cant fathom why a bad wheel
    > bearing would make a extremely high pitched noise.
    >




  9. #9
    Carl 1 Lucky Texan
    Guest

    Default Re: Subaru Brake Squeal

    Blair Baucom wrote:
    > Over in the Ford truck group it was discussed that sometimes the brake lines
    > to a single wheel would delaminate inside and would act as a check valve
    > allowing brake fluid to flow out to the caliper and when pressure was
    > released the fluid would maintain pressure not allowing the caliper to
    > release causing the brake to squeak.
    >
    > You can search alt.trucks.ford
    >
    > Not a common occurrence, but it looks like you have exhausted all of the
    > more common ones.
    >
    > Blair
    >
    > <webstericehockey@gmail.com> wrote in message
    > news:1157287169.598395.50850@i3g2000cwc.googlegrou ps.com...
    >
    >>Vanguard- Thanks for the advice, but I stated above that I replaced the
    >>old caliper with a remanufactured caliper and the squealing persists.
    >>Likewise, there is anti-rattle compound (really sticky stuff) on the
    >>back of the pad so that the pad is literally "attached" to the new
    >>caliper piston.
    >>
    >>Blair- Delaminated brake hose? Can you explain?
    >>
    >>Carl- When I assesed this problem for the first time, I went in there
    >>to replace a Constant Velocity Joint. I did not notice any debris on
    >>the dust pan, but afterwards, the dustpan was contacting the rotor just
    >>a little bit and was blatantly obvious, so I bent the dustpan back so
    >>there was no more contact. and yet the squealing is still there. Thanks
    >>again Carl.
    >>
    >>Obviously, the high pitched squeal is caused by the brake pad touching
    >>ever so slightly on the rotor, meaning that something is not releasing
    >>properly. This does not make sense, however, because the whole assembly
    >>is floating (rotors, brakes). Yet, I cant fathom why a bad wheel
    >>bearing would make a extremely high pitched noise.
    >>

    >
    >
    >


    You are correct and, I've been told, hydraulic in general can have
    'flappers' inside that cause a check valve-type behvavior. Worth
    considering but I'd still expect the offending brake system to wear
    unevenly and produce heat.

    I dunno


    Carl


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  10. #10
    webstericehockey@gmail.com
    Guest

    Default Re: Subaru Brake Squeal

    Blair - That is very interesting. I never would have though of that.
    I'll look into that some more. Thanks for the insight.

    Carl- The uneven wear pattern was fixed by installing a new,
    remanufactured caliper. Thanks, I'll definately look into the
    hydraulics.


    Now Ive heard another "myth": Could it possibly be caused by a failing
    Anti-Lock Braking System?

    Im confused by the fact that i have a new caliper, new rotors, and new
    pads and the system is still squeaking. It's really throwing me off
    that the squeaking goes away when i apply the brakes. I just dont know.


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