Front or Rear Brake Issue?

2024 Tundra with about 24k and I'm getting a small but noticeable pulsation in the brake pedal when braking at highway speeds. I don't feel any shaking in the front end when braking. Up until recently I was using the ACC daily. Is is more than likely the rear that's giving me the issue or the front? I've never had a truck with rear disc brakes so I wouldn't know what it feels like.

 

I've always found the "if you feel shake in the steering wheel, its the fronts. If it's in your seat (butt), it's the rear" adage to be accurate.

Curious note...what does "I was using the ACC daily" mean?

 

Adaptive Cruise Control

 

I've read that ACC utilizes the rear brakes more than the front, but I'm not so sure. I think measuring the wear on your brake pads would give you the answer.

I've stopped using ACC in anything but light highway traffic due to ACC trying to melt my brakes. It's just too aggressive braking and accelerating for my taste.

 

agreed, its needs TSS 3.0

 

I think the problem is the ACC system is it doesn't know how to coast to slow down. When is senses a slower vehicle within the safety bars zone, it immediately applies the brakes instead of simply letting off the throttle. Then, when the coast is clear to resume the set speed, it accelerates too quickly. It's like an impatient teenager is behind the wheel.

I have found that Eco drive mode does slow down the acceleration some, but it doesn't help with the aggressive braking problem.

 

agreed, I use it on the wide open interstates and its fine, other than that I like to just drive myself anyways

 

I had that problem on my 23. Dealership said that there was a TSB on front pads and the pads were on back order. I opted to have my local mechanic install new pads on my truck. I haven’t had any issues since. Sucks to buy a truck and find out the OE pads are undersized. It is what it is.

 

Toyota replaced my front rotors/pads/shim with T-SB-0043-24. Got it done at 34k miles on my 24 Limited, had that issue at 19k going down the i70 towards vegas and back to colorado springs. Very noticeable going 75+ and braking. My usual toyota service dealership for my toyota care did nothing to fix my issue from April 24 until last week i switched service.

 

I travel the Colorado mountain passes a bunch, and I can confirm the factory brakes on the Gen 3 are not up for the task. I'm not an aggressive driver, at all. Cautiously driving down a winding pass with switchbacks will overheat these cheap brakes and cause them to shudder. I try to engine brake, using the manual shift mode, as much as possible to minimize using the brakes.

 

Actually something I forgot to add. The front pads are at 8mm and the rear at 7mm. I'm going to measure the runout on the rears when it stops f-ing raining on my days off.

 

Same, i usually have kids in the car and going down wolf creek pass during the winter wasn’t too fun. I’ll probably switch to the powerstop set unless one of the aftermarket bbk come out with a front/rear set at a good price.

 

I haven't been over Wolfcreek Pass in years, but that's definitely the kind of pass that will melt the Gen 3 factory brakes, even with no load. I do Berthoud and Steamboat Pass quite often. Same thing. If I don't down shift to avoid using the brakes, they will shake the entire truck by the time I'm at the bottom of the pass.

Pretty disappointing and potentially dangerous really.

 

It is why I use regular "speed control " mode instead of adaptive. It works the old fashioned way.