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I had a somewhat similar issue front rotors. Never had an issue with Mazda '19 NA's brakes, but have had pulsing (audible and in the brake pedal when applied at higher speeds) with Mazda '21 since about 10k. The dealer resurfaced the rotors and the pulsing feeling improved, but the brakes continued to make a pulsing sound when applied from highway speeds. This has turned back into a pulsing through the pedal as it was before.
What was you just described your ABS working correctly, right?
Changing to new rotors may not clear up what you described?
Also depending on your driving and braking habits you may have inadvertently created a slight surface mating difference between the pads and toe rotors which is also not uncommon. Many notice this when coming down a mountain or long hill where you are riding the brakes to maintain the legal speed limits. The pulsating and sometimes very noticeable in the brake pedal and steering wheel can be thought to be something wrong with the brakes. But in reality, it is the ABS and the slight differences in clearance with contact brake parts. Many time it will clear up itself without service intervention.
\For the doubting Dorthie's, this explanation can clearly be measured on the disc/rotor and pads by measure the longitude and horizontal areas in several places and noting them in reference to the shape of each part. Rotor being a circle and a pad having multiple shapes depending on design and application.
Please at least do this measurement before doubting my information! Afterall, I do engineer and design brake system and parts.
It's not ABS as I was not braking hard (and ABS pulsing is way more dramatic than what I am getting). Are you saying in normal driving on mountain roads the abs will activate? I have never experienced this in "normal" driving, only in panic stops. I suspect it could be pad residue build up from high heat, but I figured resurfacing the rotors would have fixed it. My mechanic friend recommended new pads/rotors (as you did in another thread) and that is what I am going to do since I don't want to resurface again. I will start with a fresh set of everything and see what happens. I just had my 20k oil service and the pads were found to be 8mm all the way around, so they aren't worn out. I considered just getting new pads and having the rotors resurfaced again, but it costs about the same to do this at the dealer vs buying a set of rotors and pads and having my friend replace them for free. Dealer wanted $600 to do the job, which I passed on.
Last edited by chickdr19; Oct 2, 2023 at 04:23 PM.
It's not ABS as I was not braking hard (and ABS pulsing is way more dramatic than what I am getting). I suspect it could be pad residue build up from high heat, but I figured resurfacing the rotors would have fixed it. My mechanic friend recommended new pads/rotors (as you did in another thread) and that is what I am going to do since I don't want to resurface again. I will start with a fresh set of everything and see what happens. I just had my 20k oil service and the pads were found to be 8mm all the way around, so they aren't worn out. I considered just getting new pads and having the rotors resurfaced again, but it costs about the same to do this at the dealer vs buying a set of rotors and pads and having my friend replace them for free. Dealer wanted $600 to do the job, which I passed on.
I didn't quote you and even changed the wording because some information was more or less generic and wanted to respond in that fashion.
As for your replacing the brake parts ... sounds good just bed the new pads in correctly... but I think you know about that.
Are you sure it's your front brakes? Attachment 8936 If this is the issue, I'd personally stay away from the fix. Probably not your issue, but thought it could possibly be worth mentioning.
Yeah I'm sure, it's very apparent it's coming from the front if you're in the vehicle.
Originally Posted by Callisto
This gets more ineresting....
How about you post the service order with your personal detail edited out?
Although I don't rule out what you claim it would be very unusual for a "DEALERSHIP" to do the machining damage and not replace the rotor!???
While I can see this happening to a rookie first time on a brake Laythe I find it hard (not impossible) to read a seasoned service setting up the brake Laythe and cutting a groove in a rotor.
As for what I was implying well like I quoted you, you waited a bit long after the service of brakes to return to the dealership!
If you strongly believe the dealership was in error, go to a local service shop or a Firestone and get a brake inspection!
No offense, but I'm not finding, scanning, editing and uploading service receipts because some random person has decided they don't believe me.
Yeah I'm sure, it's very apparent it's coming from the front if you're in the vehicle.
No offense, but I'm not finding, scanning, editing and uploading service receipts because some random person has decided they don't believe me.
First trust me I am no random person/member on an internet forum. And really all you would need do is post the service only information no secrets can be seen there. LOL This means only what the service technician/mechanic wrote on the report or what was written in the comment area of your service report!!!!
There must be something missing in your explanation and don't you think someone in the industry of service may be able to read a service report and help you with?
As for you picture?????????????? auh ok so it is a rotor no brake pad and no indication from your responses that there is anything possibly in the chassis or suspension that may account for some concerns? Is this how you tell a doctor when something is wrong with you... "I just feel something is wrong doc"! lol
As for your picture??????I can do that as well .
It does not show the pads it does not give any clue of a problem.
What exactly is "quite brake service kit"?
I've never heard of such a thing except that "quiet brakes" liquid goop you put on the rotors which doesn't really do anything.
The shop claims there was no noise after the repairs.
The receipts show they did not replace your pads after they machined the rotors for a second time nor after they put on new rotors.
I always replace pads, as do the shops I now use, anytime the rotors were turned or replaced.
It's unlikely any used pad, no matter how new it is, will conform to a new or newly machined rotor without some noise or issues.
What exactly is "quite brake service kit"?
I've never heard of such a thing except that "quiet brakes" liquid goop you put on the rotors which doesn't really do anything.
The shop claims there was no noise after the repairs.
The receipts show they did not replace your pads after they machined the rotors for a second time nor after they put on new rotors.
I always replace pads, as do the shops I now use, anytime the rotors were turned or replaced.
It's unlikely any used pad, no matter how new it is, will conform to a new or newly machined rotor without some noise or issues.
I think they are one in the same, and it does do something, until it wears off. (Which doesn't take very long)
I suspect they claim they don't hear anything after they're done because they're dousing it in the break quiet before doing their post-repair testing.
Most disc brake squeal is caused by vibration between the pads and the caliper, not the pad and rotor. That’s why products applied to the pad surfaces have a limited effect. Applying an anti-squeal product to the contact areas between the pad backing plate and the caliper/piston are much more effective and long lasting. I’ve used the product below on several vehicles with great results.
OMG where to start lot of interesting information.
Basically as I suggested if your not happy with the service take it to a Firestone for a brake inspection and see if they find the mytry noise!
The service performed by the dealership IMHO not only was correct in all cases having to do with a listed Mazda procedure service but the noise as unreported in the first few responses herd both forward braking and reverse? That tad bit of information perhaps important in the beginning to post. But forward and reverse brake pad noise has a whole different meaning and as it was continued in both attempts to cure it but not herd by the dealership also supports at this point to have your brakes system, chassis and suspension independently evaluated.
Thank you for posting the vital service information.
There is a Firestone in your state...
CRC brake quiet does work VERY WELL if applied correctly which unfortunately time and time again I have seen our customers not doing! It does not work well with a driver that rides the brakes or brake for a long constant period which typically burns the chemical. This burnt or burning residue creates a buildup and can cause erratic brake feel and noise.
I also saw a requested service that was not really needed but that's for another thread .
