Is this possible?
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Suspension, Brakes and Tires Discussion, Is this possible? in Item Specific Cadillac Discussion; History: My '79 Seville has had this noise indication for over a year. Squeeling in front at least half of ...
  1. #1
    79 Seville is offline Cadillac Owners Member
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    Disk or caliper noise

    History: My '79 Seville has had this noise indication for over a year. Squeeling in front at least half of the time when braking at low speeds, (maybe 3 1/2 to 4 years now). A grinding sound when braking down near a stop, (maybe for a year and a half now). That sounds like rivets into rotors, though not as loud. These 2 things gaul me, since I really do maintain all I can on my vehicles. I've had it into a shop for these things, who turned out to be lacking in competence. I can tell you a few stories about that 'service'. Then a week or 2 ago, I took it in to another shop for rear brake work, and that went well, and the sounds I describe were not apparent to them then. Anyway, I was concentrating on the rear. But half the time since then, the front has made these sounds. Yesterday, I replaced the front inner left wheel bearing / race / seal, since it was overlooked at the first shop I just mentioned. Now as I've examined both front disks and caliper assemblies more than once, I still don't see anything in need of correction for sure. Only, the disks, which have plenty of meat on them, probably have slight variation to them. But in my experience with these things since disk brakes have been on the road, they look alright. I know that such squeel occurs at the mating surfaces of the caliper / pistons / pads, and have used spray to help there, if that's where the sound chatter occurs. No dice. Please scratch your heads, and give me some thoughts. Machine the disks? Pads are nice and beefy. I've lightly sanded these disks to break the gloss. No dice there either. What could it be?

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    79 Seville is offline Cadillac Owners Member
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    Thread Starter

    Is this possible?

    Can brake squeal and a grounding-down-to-stop noise occur from a very minimally noticeable wheel disk imperfection?

    (follow-up on post from 2 days ago)...

  4. #3
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Re: Is this possible?

    Could, what type of imperfection are we talking about? Do you have access to a dial indicator? check for any runout. Take the slider bolts out and inspect them. make sure they don't have any weird wear patterns, and that they aren't binding.

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    brougham is offline Cadillac Owners Master
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    Re: Is this possible?

    Disc brakes like to squeal. If you haven't changed the pads yet try something different to see if it makes the noise go away.

  6. #5
    79 Seville is offline Cadillac Owners Member
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    Re: Is this possible?

    Quote Originally Posted by DaveSmed
    Could, what type of imperfection are we talking about? Do you have access to a dial indicator? check for any runout. Take the slider bolts out and inspect them. make sure they don't have any weird wear patterns, and that they aren't binding.
    Dave - Are the slider bolts the 2 that hold the caliper on?
    If so, these look just fine.

  7. #6
    79 Seville is offline Cadillac Owners Member
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    Re: Is this possible?

    I don't have a dial indicator, and the imperfection I see is some very slight grooving, and very slight dipping. However, this is so minimal that I have never seen such as reason enough for the noise symptoms. The squeel is one thing, but that low grade grind at maybe 3 or 4 mph - to dead stop, is of the most concern. Still, maybe they are the same problem.

    Sorry to bring up something that seems hard to identify, but I hate the old trial and error method of unnecessarily replacing parts. I guess I could use something as a stylus that won't damage the rotor, and spin it to hear it's trueness, as is done with a dial indicator.

  8. #7
    Imprl59 is offline Cadillac Owners Fanatic
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    Re: Is this possible?

    Sonds like the pads to me. Some pads have different metallic content and tend to make noise. Try another set. I would try to find some soft ones, non-metallic if you can. You will have to replace them more often but they will be quieter.

    Steve B.

  9. #8
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    EastOfGratiot is offline Cadillac Owners Member
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    Re: Is this possible?

    I don't know about the grinding noise, but squeaking brakes are often caused by vibration between the metal pad backing plate and the caliper. Some newer OE replacement pads come with a tube of material (rubber?, silicone?) that you apply to the back side of the pads before installation to prevent pad squeal. The last set of OE pads I purchased for an S-10 pickup came with this stuff, as did rear aftermarket pads I purchased for an Eldorado a couple of years ago.

    It might be worth a try.

    http://hometown.aol.com/wadewmbryant/seville.html

  10. #9
    79 Seville is offline Cadillac Owners Member
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    Re: Is this possible?

    Thanks for your comments / suggestions, folks. I plan to change pads now, and look for types you mention. And check trueness of rotors mor precisely. Good thoughts in your replies!

  11. #10
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    Murphyg is offline Cadillac Owners Connoisseur
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    Re: Is this possible?

    Possiply one of the calipers may be loose. If its only happening at low speeds those slight dips you mentioned may be causing the caliper to shift and give that grinding noise you refered to.
    Take your tire off and give them a pull, push, yank. I believe they should be firm and shouldnt have any play.

  12. #11
    79 Seville is offline Cadillac Owners Member
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    Re: Is this possible?

    Hey thanks folks for all your replies. Saturday, I took the front wheels and pads apart again. I checked the rotors with my version of a dial indicator. I layed the tire down and tire iron on top, with my knee holding it aimed up to the rotor. Both sides 'indicated' some slight warpage. So the auto parts turned them both for $8.50 @, (they removed .010), and I put it all back together with my new $42 ceramic pads with the antisqueal backing plates. Now they're all seated and feelin' fine. I used the brake spray just to help insure the squeal avoidance.

    So I have an extra set of pads now, since a shoddy shop had put these so-so pads on several months ago. They have some metalic content, which means some squealing can be expected. I should have known they didn't check those rotors well, since they had only replaced the outer wheel bearings when they said they checked all through everything. Too short-cutting to remove calipers and check the inners. I did that several days ago too. So all looks good. All cleaned up nicely. Good to go...

    Muchas Graz...

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