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jhammermil20088

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Discussion starter · #1 ·
I've got a 2012 Honda Odyssey. The brakes sound like they are dragging, especially around 30-40 mph. I can hear a very light scrubbing. It goes away when braking.

I recently replaced the front brake pads and rotors about 12 thousand miles ago and now they are vibrating again. The rotors look like they are overheated, and I measured the temperature at one point and I was getting 250-275 degrees f on both rotors. I inspected the calipers, caliper pins, brake hoses and all look good. Calipers are not binding. Brake fluid is coming out of bleeder screws normal.

I've read a few of the threads here and watched some youtube videos. Can't really find much. One person suggested pulling the abs fuse which I haven't tried. Some say it can be the master cylinder or brake booster. I am not having any of the typical signs and symptoms of a faulty master cylinder or brake booster problems. What could it be?
 
#3 ·
What are the rear temps like? It would be weird to have two dragging brakes.
 
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Discussion starter · #4 ·
2011.2017.odyssey said:
cheap semi metallic pads can be noisy when they get warm and make scraping or squealing sounds

maybe your rears are finished, what do the rotors look like?
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WiiMaster said:
What are the rear temps like? It would be weird to have two dragging brakes.
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I did not check the rear rotors, however the rear rotors and pads are brand new. All replaced with ceramic pads. I will check the rear temps and report.
 
#5 ·
First of all, the brake pads do always touch the rotor even when you are not using the brakes. Thats normal but noise always is not normal.

The extra noise is most likely a rust buildup around the edge of the rotor, rubbing into the pads. It could be on the rotor side toward the inside, so it would be harder to see when the wheel is on. I'd take the wheel off and make sure your rotors on both sides are smooth and not rusty where the pad touches.
 
Discussion starter · #6 ·
conozo said:
First of all, the brake pads do always touch the rotor even when you are not using the brakes. Thats normal but noise always is not normal.

The extra noise is most likely a rust buildup around the edge of the rotor, rubbing into the pads. It could be on the rotor side toward the inside, so it would be harder to see when the wheel is on. I'd take the wheel off and make sure your rotors on both sides are smooth and not rusty where the pad touches.
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No rust. Everything looks great.
 
#8 ·
If brakes are dragging or making noise, usually you here it most at low speeds. For example after a rain a light film of rust can build up on the rotors. As you back out of driveway and head off you will hear the pads dragging for a minute or so.

You stated you hear it most at 30 - 40 mph. Could a plastic shield be loose or vibrating or something else. Doesn't strike me as brakes, but hard to diagnose it from my computer screen.
 
Discussion starter · #9 ·
Milanomike said:
If brakes are dragging or making noise, usually you here it most at low speeds. For example after a rain a light film of rust can build up on the rotors. As you back out of driveway and head off you will hear the pads dragging for a minute or so.

You stated you hear it most at 30 - 40 mph. Could a plastic shield be loose or vibrating or something else. Doesn't strike me as brakes, but hard to diagnose it from my computer screen.
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The noise goes away when I press on the brakes and then it comes right back after I let go. I inspected everything and it all looks good. And the odd thing about it is both rotors and pads are wore down equally. The calipers aren’t stuck. The brake hoses drip just fine. I verified that. Some say it could be the master cylinder sticking but I’ve never heard of that. I don’t have pedal problems. It is very firm. I’d hate to change the master cylinder if there is nothing wrong with it. I guess I could start with the brake hoses. I’ve never seen a set of calipers or brake hoses go bad at the same time. I’m leaning towards replacing the master cylinder but I just want to be sure.
 
#10 ·
I wouldn't change anything until you know for certain, if the there are no braking/performance issues aside from the unexplained noise.

a video or sound recording may be more helpful here.

when you release the brakes the travel from the pads to the rotors is minuscule, were talking millimeters.

have you applied the parking brake while moving slowly?
its a separate system inside the rear rotors but may be the culprit.
 
#13 ·
I'll be the first to admit, I have no idea what the actual temperature of my rotors are on any car after driving. I do know they are way too hot for my bare finger to touch (guess how i learned that many years ago).

My good friend Google turned this right up:

Thermal camera shows how hot brake rotors get during use (motorauthority.com)

and this:

Should brake discs get hot? | Kwik Fit (kwik-fit.com)

Seems like 250 F or higher isn't unreasonable.

Sticking with my earlier guess analysis in that not sure you have a brake issue.
 
Discussion starter · #17 ·
2011.2017.odyssey said:
I think your concerns are crossing over into neurosis territory.

spend some money on a diagnosis so you can rest easier.
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No neurosis here. All the suggestions here have been great, but they are the typical suggestions that people advise that I've already done. I'm trying to think outside the box here.

It's not talked about a lot, but I heard Scotty Kilmer and some others mention a sticking master cylinder in their articles. I also came across this description on Napa's website
  • New Piston Assembly And Return Spring, Prevents Brake Drag And Premature Pad Wear.
So apparently it can happen. I am most likely going to start with replacing the master cylinder and go from there.
 
#19 ·
This ^^^

why had none of us thought of that, it would make a high pitch squeal/scraping sound.

the stainless hardware on the caliper bracket can touch the rotors and make odd sounds, at odd times

my Acura had this issue that would only manifest when the wheel was turned hard while moving.

nephew had painted the calipers for me, but didnt reinstall the hardware correctly.

removed the hardware, bent the tabs in, tapped it into place on the caliper bracket, and the noise was gone.
 
#20 ·
jhammermil20088 said:
..others mention a sticking master cylinder in their articles. I also came across this description on Napa's website
Click to expand...
Why would the master cylinder stick? Are you confusing it with the cylinder in the brake caliper? And I can't find your Napa reference.
 
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