Im getting a nasty "HUMMMM" that vibrates the whole car.. I just changed my rear brakes today and I took it out for a test drive. All was well till I backed into my parking spot.

When I was in Reverse going into my spot I got a nasty "HUMMM" noise that was low in pitch and vibrated pretty much my whole seat. It happened with the wheel straight backing up, turned to the right backing up, and the same with the left.. It only happened after the brakes got heated up; from a cold start I backed up a few times before I left and it was quiet.

My buddies stepdad said possibly a seized caliper? Any ideas; I cant do much more work now as a thunderstorm is about to roll through.

 

lol, thanks for starting this thread. I was about to ask the same question. I've had both rear calipers changed (as well as e-brake cables). I'm also getting a nasty humm when i let go of the brakes from a stand-still. (but only going forward, not in reverse)

 

To answer the both of your questions yes,the calipers is sezing a bite and it's about to get worse. To save the calipers you guys can disassemble the caliper and grease every single moving component and slider pins and where the brakes sit in. Put some grease on the back of the pads so they can stick to the calipers. DON'T use grease on the rotors or the front part of the pads where they contact the rotor because there Is going to be lot's of problems and the noise will still prevail.

 

so much for rebuilt autozone calipers

 

It it also be due to an overtightened e-brake cable?

 

if its so tight that the e brake engages with the handle down then yes.

 

I had a similar issue, I regreased everything problem came back. I decided to pullout the piston in the caliper and it was all corroded. Ended replacing both calipers. Problem solved.

 

i had this humming when my pads were not properly greased. they were rubbing against the clips and causing a vibration.

 

Thanks guys!!
Thanks rocky, now THAT, sounds more like my problem

 

Maxima98SE, what about your problem?

I haven't used the e-brake for the last two days, and don't you know it.....no noises
I know that caliper works, cause the rotor is just as warm as the other side. I'll try to re-grease the caliper in the coming weeks.

 

Just a tip when replacing pads... if the pads are fitting really tight in the bracket that holds them, take the retaining clips off and scrape off all the rust that has formed on the bracket under the clips. A screwdriver or small wire brush should do it. If it's really bad, I'll use a file. This usually makes a huge difference. Also, if you're not replacing the clips (you should), make sure the surface that the end of the pad slides on is really clean.
I don't know if this could cause the humming issue, but I suppose it could if the springs on the retaining clips aren't able to push the pads away from the rotor because they're binding.

 

Gentlemen, if your rear brakes are humming, it is because the pads and rotor are not acoustically isolated from the calipers and chassis. The rotors will transmit a harmonic frequency to the chassis via the pads....and the noise is amplified by the chassis....

To avoid this, be sure to add a thin bead of high temp rtv silicone to the rear of the brake pad to shim mating surface. Then lube the mating surface of the shim to caliper with moly lube grease to ensure proper movement.

The RTV acts as a damper, mitigating all harmonics.

Also make sure you turn your rotors....Nissan says these are "bolt on" when new....
I found out that this was BS, too smooth of a braking surface can also cause humming problems....anything greater than Ra125 surface finish is trouble. take 0.005in off....Better yet, don't get Nissan rotors, they will always warp and crack on you.....

Go with brembo, a much better product IMO.

 

I had the same issue. Mine had two problems though. My pads weren't greased right and both of my E-Brake cables were seized! Re-greased the pads and replaced the e-brake cables.......problem gone. Good luck with your problem!

 

nice post....welcome to the org

 

Thanks for your post, rnmaxima.. and welcome to the ORG!!!

I think you've nipped it in the bud.

When my rear calipers were changed, the guy doing the work didn't lube the shims, in fact, it seems like the pads aren't too secure (looks like they slide). When i asked about the noise, the shop owner said that it's the pads; and he's seen maximas do that, but couldn't recall what the solution was. So, i let it go, and didn't feel like asking them to take things apart to lube 'em.

LOL, it's funny when the only problem with 6th gen maxis or G35s seem to be warping rotors, crappy pads or even "strange noises" cause people to complain. I say, "Why can't you just get some Brembo blanks & Hawk HPs? "