Brake squeal while accelerating and coasting

Hi guys, I've been having an issue with my Tundra since I bought it used, figured it was time to get to the bottom of it. It sounds like I have a brake squeal when I'm driving, but not when I'm pressing the brakes. It happens inconsistently, but fairly frequently.
I'll be coasting along, keeping up with traffic, and a load, high pitched whine like a brake squeal happens. It sounds like it's coming from the passenger front wheel area.
The sound STOPS consistently if I press the brakes, but starts up again a few seconds after I release. It happens whether I'm accelerating or coasting.
Could this be a rotor issue? The pads have plenty of life left on them, like more than 50%.

Thanks in advance!

 

i would guess a stone is trapped in there and is making noise.

 

^

Pulls the wheels off and check

 

I took the wheel off, didn't see anything obvious, but also wasn't sure what to look for.

 

My wifes 2016 Accord has been doing the same thing. I was told to check the guide pins to make sure they're lubed up and to replace the hardware around the pads. I was going to just replace the pads as well since i'm already in there.

 

hardware dragging on rust built up on rotors. The rust builds up a ridge.

 

Dont know if your issue is same as mine. on my lx570 drove back from houston to dallas for 4 hours and at the end of trip i started noticing continuous squeak from rear side, my first guess was probably jammed piston. When i took off tire and could not see anything which could be causing it i looked at brake pads and they looked decent from outside. i removed brake caliper and only front side brake pad came out, could not find the rear side pad. when i looked at the caliper piston it was all grinded down halfway on the inside of rotor. I took rotor off and found rest of brake pad in between rotor and brake dust cover it was just trapped in there rubbing and everytime i was applying brake the metal piston was pushing and grinding against the rotor. so now i have to replace rotor brake pads and caliper piston.
So if brake pads looks decent from outside, dnt rely on it.

 

Worked in the industry for 17 years, and I also spend a lot time on various tracks. Brake squeal occurs for a few reasons.
1. Heavy truck like the Tundra, pads could be glazed from heat. Remove pads and if shiny, likely glazed. Take a sanding block and sand off the top surface. Wear a mask, I'm sure you have one laying around. Clean and reinstall. I also lightly circle sand the rotors to give it a little bite. Not needed, just me.
2. Foreign particle embedded if it is the same side all of the time. Block sand.
3. Loose or defective hardware. Clean brake hardware.
4. A lot of metallic in the pad compound. Every pad is different. If a semi metallic pad I recommend a really good ceramic, note, no such thing as a pure 100% ceramic pad, they all have fillers. I have found Akenbono to be a decent street pad for my Tundra and I drive it harder than most.

 

Thanks for the help guys. I'll take it apart and look for debris, then possibly sand down the surface if necessary. If nothing works, I'll just replace the pads and rotors

 

The backing plates get bent and rub the rotors. You can bend them back by just pushing on them. I had this issue right after putting on new rotors. Sure it’s the brakes and not engine belt?

 

I checked the backing plate,it didn't seem to be rubbing. I pushed it back a bit anyways and the sound continues.

I don't think it's the engine, as it only makes the sound when driving, not when idle, and always stops when the brake is pressed, even lightly.

 

Sorry for reviving an old thread, but did you every figure out what was causing the noise?
I'm having a very similar issue and cannot seem to figure out what's causing it.

 

Replacing pads and greasing the guide pins fixed the issue on my wife's Accord.

Are you still on factory pads?

 

Aftermarket. Swapped pads, rotors, greased pins, etc. to correct it. Dealer (not Toyota) had replaced front & rear, but they warped after 10k miles in the front.
Seems like it's only after everything gets hot. I thought it was coming from the front, but maybe it's the rear? I've read the park brake can cause a similar sound.
I have not taken the rear apart yet.

 

I chased a squeal which i thought as coming from the rear of the truck that only happened once in a while.
turned out to be he front inside passenger brake pad had some debris in the cutout/relief.

I would have bet money it was the rear but a co-worked mentioned if i already ensured the rear was fine i should see about the fronts to rule them out.

Lesson learned, remove the front brake pads and inspect them off the truck.

Otherwise i had a rub on the rear rotors that you try to rule out.
in contact with inner seam of the backing plate you couldn's see without removing the wheels and possibly the rotor to find the contact area.

good luck.