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jackx
User
Jul 1, 2015, 8:22 AM
Post #1 of 13
(1708 views)
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Whenever it has rained it seems my brakes start acting up on my 1997 Blazer. When You push the
pedal down you will hear a loud grinding coming from the calipers. I have pulled the wheel off and
put disk brake quieten-er on them and the sound goes away. After a while the noise from the
calipers will stop and when this happens. It is like you flipped a switch because the sound completely
stops when prior to that it was a loud grinding noise every time you hit the brakes. How do I determine
what is causing this?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 1, 2015, 8:26 AM
Post #2 of 13
(1704 views)
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Where are you spraying this stuff?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 1, 2015, 8:29 AM
Post #3 of 13
(1703 views)
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! You are calling this LOUD so something is really wrong not just that goo to help quiet sometimes normal squeaks.
What do the rotors, friction sides of pads and hardware look like? Can dust shield touch the rotor or way too close in any spot? That can be a cause you can miss if not looking for it,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 1, 2015, 9:33 AM
Post #5 of 13
(1692 views)
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I'm still waiting for an answer on where he is applying this stuff.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jackx
User
Jul 1, 2015, 10:04 AM
Post #6 of 13
(1688 views)
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Hammertime ans:I spray it on the pads. I don't spray it on the pad side that rubs on the rotor. I spray it on
the other side that rubs against the metal caliper.
Descrete ans: I am looking at the can. Its called CRC Disc Brake Quiet " Eliminates disc brake squeals"
Tom's' ans: I agree the noise is a lot louder than the squeak that the Disc Brake Quieten-er is usually used
for. I think something else may be the problem and the Quieten-er just helps for a while. The calipers are
original Equipment and the truck has 230k miles on it. The wheel bearing on one side disentigrated once and
the caliper and the wheel bearing nut was all that kept it on the spindle. So, I'm thinking maybe I need to
replace the caliper. I just was wanting some advice from techs that may have run across this problem before.
The pads are in great shape. The entire front end was rebuilt about 6 months ago after the wheel bearing
problem. The mechanic did not replace the calipers . This loud grinding noise only happens after a rain storm.
It's not making that noise now.
(This post was edited by jackx on Jul 1, 2015, 10:15 AM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 1, 2015, 11:56 AM
Post #7 of 13
(1678 views)
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Did this start right after a brake job was done?
What brand pads? Were the rotors machined on this when the brakes were done? Any other parts replaced? Greased the slide pins and replace the caliper bushings? Did you knock the tabs down on the outboard pads?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 1, 2015, 11:56 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 1, 2015, 12:28 PM
Post #8 of 13
(1673 views)
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Wow! Bearing "disintegrated" not just noticed but enough to cause harm to brakes - yikes!
Now I question all parts to do with this including the dang dust shield. Bearings could go all at once by surprise. That is so rare to me I've never had one completely blow up without ample warning sounds and feelings,
T
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jackx
User
Jul 1, 2015, 1:34 PM
Post #9 of 13
(1667 views)
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Yeah when I took off everything was ok but after I hit a dip the passenger side lower ball joint broke and the
outer bearing on the passenger side wheel went all to pieces when the wheel tried to come off the hub. The washer and nut and caliper kept it on the hub.
The wheel was trapped in the wheel wheel and it made all kinds of racket until the truck came to a stop. I replaced that rotor. The shoes were ok. The driver's side was ok but I replaced on both sides all the wheel bearings. ball joints and tie
rod ends. The dust covers were removed and reinstalled by the mechanic after he replaced all the ball joints.
I'm thinking the trauma the caliper went through may have warped it and the pins may be loose. The rotor is new.
Just does not make any sense why it only does this after there has been a rain storm. I do know that when the
ball joint broke it did bend up the dust cover. It was gouged and tore up so bad that after the mechanic had to beat it out
straight to get it to fit back on the truck. I did notice the cover had a hole in it. It's not rubbing but I'm thinking now that maybe water is getting to the pads through that hole. Its about the size of a dime. It's got a dust cover for some reason I guess. So, if the water gets to the pads and caliper could that cause the caliper to make the loud grinding noise.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 2, 2015, 1:53 AM
Post #10 of 13
(1657 views)
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? This needed to be treated more like an accident with that much gone wrong. Something bent or broken was missed in the fix as best as I can guess.
Dust/water shield is just helpful to not soak and really foul up brake with dirt a little. They can still get wet driving in a decent rain and pads or brake material might drag or not have friction is soaked and dry out fine not ruin it unless contaminated by more than common road waters.
Some brands of friction material are just better than others.
If dust shield is OK and in place a small hole probably has nothing to do with anything. It must have sustained more damage when fixed than was done and needs a total check out again unfortunately may have to replace stuff that was already done again,
T
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jackx
User
Jul 2, 2015, 8:00 AM
Post #11 of 13
(1648 views)
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I had another gm product and a mechanic looked at it to determine why when you slammed on the brakes real hard the brakes would make a noise real similar to what the Blazer is making. He said the ABS was the problem. I solved the
problem by selling it. Could the ABS on the Blazer be the problem. I know the ABS stops the vehicle from pulling when
the pavement is wet. The SES light is not coming on.
(This post was edited by jackx on Jul 2, 2015, 8:35 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 2, 2015, 8:56 AM
Post #12 of 13
(1645 views)
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It's a '97 so you can get codes for ABS issues. It should default to NO ABS and light come on dash when first touching brakes with a failure. If not it's good and messed up or bulb may be out? Try turning key just to "run" without starting and see what bulbs light as a bulb check and glance again just the moment while it's cranking.
If you never see that bulb it's been blown or removed and IDK why ABS would still work? If it did activate and wasn't prompted it's totally unsafe! Yes it would give you a buzz feel in brake pedal if it was normally working and slipping while braking.
This issue if you aren't going to tackle yourself needs to go out to a shop that takes on about anything. It's not just brake stuff with the history you mentioned now, it could be broken or bent things not noticed. There's a star wheel on driveshaft that could be messed up or who knows - it got wrecked?
Seriously - no more "he said, she said, someone said" it could be this or that. Time for it to be totally checked out and tell them the history,
T
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jackx
User
Jul 2, 2015, 9:35 AM
Post #13 of 13
(1640 views)
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Thanks
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