Carlson Low Frequency Damper Application

[@nathangebben5738]

Great video! Was wondering what a Brake Caliper Low Frequency Noise Damper did. Lots of videos showing HOW to install them...But not one showing the difference between them installed vs not installed

[@after6tuning]

I like this idea but I am baffled by something maybe you could answer. I have been in the automotive repair industry for about 18 years or so. These seem to have been a somewhat recent innovation that I see on newer ford trucks. Brakes have been around for many years and many years of innovation through pad and rotor technology. I feel like these are a band-aid to deeper problems like maybe wrong pad material or rotor glazing etc. Why do most vehicles never need these but ford trucks seem to use them. Maybe others use them and I haven't yet noticed.

[@nathangebben5738]

Same here, master tech and Ive just recently learned about these. Never knew they were even a thing

[@nzs316]

Is it possible that its the ceramic material being used? When i put regular pads, i had no squealing. Then when i installed the ceramic pads i would get a very loud squeal every morning on the first braking until they warmed up.

[@robpeters5204]

This sounds like a pitch from a snake oil salesman.

[@gadgetdeez7069]

I can vouch for it. Brakes squeel for several reasons, and one of the most prominent is the harmonic between gripping and slipping and the free play in the suspension that is a result of using rubber bushings. Slipping friction is always lower than gripping friction. this is why cars have ABS, to try and use the tire's sticking friction to stop, not the slipping friction (skidding).. The brakes slipping friction increases the closer it gets to a stop. as the pad "Bites" the rotor, the caliper, knuckle, and control arms start to move, there's also a small deflection within these parts. as the bushings offer more resistance to rotation, the brake bad can't hold the rotor and lets go. This causes the whole assembly to "Snap" toward a rest position. as this causes a slight overshoot, the pad now has a chance again to "Bite" the rotor and the process happens over and over, thousands of times a second at the harmonic frequency of the whole assembly. If you change the mass of this assembly (As GM did on the 5th gen camaros with wheel weights stuck to the caliper, or later where 2 weights were attached to the brake pads themselves) you change the harmonic frequency of the assembly. If the new harmonic frequency of the assembly is out of tune with the system as a whole, (frequency of the caliper, knuckle, arms, Vs caliper knuckle arms and bushings which offer the "reset" frequency for the system) then there is no more harmonic, and no brake noise. think of it like pushing someone on a swing. that's a harmonic resonance between you pushing (The control arm bushings) and the swing (the caliper, knuckle, control arms).. if you change the frequency of one of the 2 system components, in this case you pushing (Possibly switching from rubber to poly or solid bushings and stiffer control arms) now you're trying to push at a different rate than the mass on the swing. however in this video we are changing the mass which does the same thing. It's simple 10th-11th grade physics.