Brake noise

Alright ladies and gents, coming at you with another issue I csnt seem to figure out. When I brake at very low speeds, I’m talking 5 and less mph. It makes what sounds like a muffed up mooing sound. It doesn’t happen every time though. Just here and there. I have cleaned the rotors and brakes. I have bleed all the brakes. No air. It doesn’t get real spongy. Maybe it’s just me but I the brake pedal does go down just a hair when it happens and it vibrates. Like I said above it makes a muffed up mooing sound. My rotors and brakes aren’t even a year old. It just started happening after I re-installed the calipers after doing my ball joints and tie rods. Any help is much appreciated.

 

after you removed the calipers ... did you also take out the pads and the clips? I assume there was no need to push in the piston since you didn't change any pads for this job ... No?

Sounds like it all happened after reinstalling the calipers so maybe one of the clips or pads is not sitting right.
Do the caliper pins move freely?
Unless something else is going on and it's just a coincidence that you have noticed it after the tie rod job.

also warped rotors can cause vibration as well. Some say lug nut over-torque can cause or contribute ... However, I've read threads over 20 pages long and people arguing both sides of this. lol

I've never done a ball joint and/or tie rod work and have no idea what's involved and how it can impact the brakes.

Best is to trace back your work where it may have impacted the brakes directly and/or indirectly.

 

If it didnt vibrate prior to putting the tie rod and ball joint......

Im gonna go with brake pad contamination.
A smidgen of grease on a pad
will moo till the cows come home.

 

Did you pull the abs sensors to do the ball joint? Make sure they are properly seated. I live on a loose gravel road, and my wheels sometimes slip at the first stop sign as the gravel is shifting and not every wheel stops at the same speed. ABS engages and I get that soft pedal feel with a groaning (maybe "moo"). It doesn't happen on pavement so I think its my abs working as intended. Perhaps yours is engaging when wheels are planted. That is activated by the speed sensor inboard of the hub at the wheel. Make sure yours is clean and seated well on the oring.

 

Sounds like these guys are on point. Mine did the same thing at about 5 and under. I had rebled the brakes a few more times and had to readjust my rear brakes to make it quite. It still does it if I'm turning and com to a stop, like pulling in a parking spot to quick at an angle.

 

Did we grease our caliper pins and pads and all contact points on the rear shoes? Could be you have vibrations that are stopped by the grease (SilGlyde).

 

I did not remove the pads I had the caliper bungee corded up because I didn’t remove the brake line. The abs thing could very well be it because back when I had my truck up north in the snow it kinda sounds like what would happen when your sliding on ice and braking. I did clean the rotors with brake cleaner but not the pads directly. None of the pins are free. I wonder if it is the speed sensor. Because my truck is rusty. So rust could have gotten in there. Thank y’all for the advice.

 

I apologize, it’s been a while since I have been on the forum and I’m terrible at giving updates. I found the issue weeks ago, it was my wheel speed sensor not fully seated. She hasn’t groaned at me since.

 

So does the wheel speed sensor seating explain your observation or was it just you?

"Maybe it’s just me but I the brake pedal does go down just a hair when it happens and it vibrates. Like I said above it makes a muffed up mooing sound."

 

The wheel speed sensor explains its, it was engaging abs due to it not being fully seated! I noticed it once I got in there.