Weird brake problem

2012 4x4 dcsb auto

A few months ago I had dealer do my front brakes almost immediately after the first drive every day the first two stops were nothing but brakes screaming and almost locking up

they replaced under warranty last month and they made it about 800 miles before they started doing the same thing again. This time they are locking up on the front.

after my second stop sign of the day they won’t do it again unless truck sits for several hours at a minimum

It’s happened in weather from 60 to -20 rain snow and dry days

this time to dealer they were awesome and started troubleshooting but 3 techs are stumped. I told them I would reach out to the community for assistance.

I’m on nights this week at work so please don’t get upset if I don’t reply right away.

thanks
Jeff

 

I had the same problem, minus the locking up on my truck. I replaced my front pads and rotors and rebuilt the calipers recently on my 2007. I didn't replace the pistons when I rebuilt the calipers, just cleaned them as best I could and put new square cut seals in. The brake dust buildup where the pistons contacted the back of the pad was pretty bad. After cleaning mine, the squeal is way better and rarer now. I wish I would've replace the pistons while I was in there, had to get back on the road though.

 

that does make since actually. Thank you.

Wonder if dealer did anything on first install that set the problem in motion?

 

Maybe a lack of grease on the back side of the pad and or slide pins when they did it the first time.

 

That was my original thought. but after the second time I assumed that someone had to of greased them.

I do know for sure that today on the third time they did grease everything well and I will have to wait till the morning to see they the scream at me.

They were hinting around about an abs module but I dont believe that is it. I could be wrong but I have never had any abs problems and my screaming is only the first mile or two after truck has been sitting

 

The screaming noise, would you say it’s pad to rotor, or maybe pad to piston or tire to road? I’m pretty sure you’ve got a 6 lug with the 4 piston calipers.

Since it’s a dealership, they should have the resources to resolve the problem. I know in the past, brake pads from Toyota came with the hardware that goes between the calipers and pads. Also the pads came with anti squeal shims for the backside of the pads.

Most common noise is the pad to rotor vibration. Semi metallic pads can be noisy.

I once put in a combination of brembo rotors and repco metal master pads. On cold mornings, the first two stops were as if someone put oil on them. After that they worked almost too good. I’d find myself stopping too soon accidentally repeatedly.

 

They have replaced the hardware they told me both times.

The sound is pad to rotor im pretty sure. i dont know what bad to piston would even sound like. It sounds like what it sounds like if your pads were worn all the way down to the squealer tabs ive got a video i will try and get on youtube and post a link here

 

See if this works

https://youtube.com/shorts/nylMwzlWS1c?feature=share

 

Sounds like pad to rotor vibration. Sometimes you can get away with not machining the rotors if they don’t look too bad. But the correct response is they need to be machined every time.

Another cause of noise like that is getting oily substances on the rotor or pads. Oil gets absorbed into pads like a sponge. Now that brake cleaner sold to us sucks you might need new pads. Maybe washing them with carb cleaner will do, it will probably get the rotors cleaned.

 

Have you are the technician properly bedded the pads?
By that I mean a intentional thin even layer of brake pad material applied to the rotors with a intentional process.

 

from looking at the receipts from the dealer on both visits the rotors were turned each time with new pads

I cant answer this question. I know about break in instructions for some pad manufacturers but would like to hope and think that everything was done correctly.

 

You can do it correctly.

When you get your truck, drive and brake gently to a very low traffic area. Accelerate up to 60 or so, and using firm brake applications slow to 15 mph or so, and Accelerate up again, do that 3 or 4 times. It really helps alot.

 

i will do it on the way home this morning. hopefully its not too late

 

What do you mean by "almost locking up"?

The tires stopped rolling and skid?

The brake pad fused to the rotor?

 

brakes are grabbing so hard that it sets off the abs. always on snow and if i push brake pedal at 1/3 of way down on ashpalt the front tires will squeal as the wheel/brake stops turning and abs activates

 

Did you get fully metallic pads?

All they changed was pads and turned rotors, right?
If that's the case, then they didn't bleed fluid or fk with the abs, right?

I would assume there is gravel/metal or something stuck in the pad or you have metallic race pads in there now.

Try getting some ceramic pads and some brand new slide pins and the spring that pushes the pads away from each other.

Before you change them, hose each side down with a whole can of brake cleaner.

 

correct pads and rotors. no fluids or abs messed with

i would agree with the gravel idea but its happened on two different sets of pads. At this point I do not want to buy new pads since these have 1000 miles on them and theyre covered under the warranty since dealer installed them

 

Something is not installed correctly then.

take a wheel off and take some pictures, so we can see.

fuck the warranty and fuck that shop. they are fucking worthless. the fking calipers are held on with two bolts and the pads are held in by two pins and a spring. it not that fking hard.

you gotta learn to do this shit yourself. these shops are getting worse and worse with their professionally trained "technicians". They don't care about you or your truck...

get in there, take a wheel off and show us what is happening.

 

it will be a week or so for pictures. I’m working 7 12s and trying to keep an eye on house being built


I did the break in this morning and the brakes didn’t squeak before I did it so that a good start

 

Failing flex hoses can produce similar symptoms. They break down internally and can cause a 'one-way valve' effect. Is this happening on only one side, or both?