Help Me Diagnose a Braking Issue

I have been chasing this down for months. It was only a few days ago that I found out it has a name.

Background: 2017 Tacoma TRD Sport; has rear disc conversion with master cylinder upgrade (all from SOS Performance). I won't discount this completely as the source of the problem, but I have huge doubts that it is.

Problem: This issue has been present through three sets of brake pads and rotors. All different brands. The latest are Hawk light truck pads and Raybestos performace rotors. Moderate braking between 40-50 mph exhibits a judder. It cannot be felt in the steering wheel or the brake pedal. I imagine it's in the front, but it could be in the rear. I would like to block off the rear lines to check, but they're braided and I can't find a solution to block them off and be able to drive the truck. I have bedded the current pads twice according to Hawk's instructions. Brakes system was bled by dealer not that long ago.

I am going to check rotor runout (even though the below article states it's not the cause it could point me to a hub issue), clean the crap out of the hub/rotor mounting surface, and check the axle nut on the driver's side for proper torque (it was removed by ECGS for the bushing install).

Unfortunately, I can't remember when this started. I do know that it started when I had the OEM pads and rotors on.

Here's an article on BTV (which describes what is happening): https://www.knowyourparts.com/techn...mponents/difference-dtv-pulsation-btv-judder/

If TW censors it, just google BTV brakes and there's a few articles that come up.

 

I would not be surprised if you have the same problem that shows up with the factory drums. If so, that reinforces the theory that the pulsing comes not from the brakes, but due to issues with half-shafts. If there were such an issue, it would show up weather you had discs or drums.

 

Captain Obvious: you're talking up front? I thought people that were going through that were having issues with the rear axles? My memory may not be remembering correctly, but I do know that I read that thread on here.

 

ummmmmmm

 

ummmmmm #2

 

ummmmmm?

 

No, I'm talking about the rear. That's where people are having trouble. If you're not feeling it in the wheel or the pedal, it's probably in the back.

 

Gotcha. Just wanted to clarify. I'm going to have to see if there's something available in the aftermarket yet. Thanks.

 

Just a guess on my part, since it fits the symptoms and a known issue. I don't know that it has been conclusively tied to half-shafts or not, but that makes the most sense of the theories I've read.

 

Will solve the issue of isolating the rear, but I'm 88.3% sure the vibration is in the rear. Otherwise you would feel it in the wheel. (another 88.2% diag estimate). If it were mine, I'd take it all off, and toss it through the window of where you got it. I'm sorry for your issue.
Zim