Couple of new strange noises.....What do you think?

[2007HummerH2]

Now that I have been running the 3 for a few weeks, I have started to notice a couple of strange noises:

1) If I hit the brakes and need to stop fairly fast, like when someone pulls out in front of you, I hear what sounds like a grind from the rear of the 3. I think I remember reading something about H3 brakes like to grind sometimes but couldn't find the post. It's a low rumbling sound. Stopping slowly it doesn't do it. The H3 only has 30K miles. Is this normal or is there something I should look for?

2) When stepping on the brake pedal I hear a pop sound. Like a heat shield making a pop, or if you bend thin metal and it makes that boing sound when it goes back to shape. Really hard to explain the sound. Coming from engine compartment area.

3) My seat makes a clicking sound when going around corners or putting pressure on the seat. I can make it do it when sitting in the seat and pushing on the back of the seat with my feet on the floorboards. Not sure what it is...

Any info would be great!
Looking forward to getting the new Bilstein shocks in the 3 tomorrow.....Going to be a great truck, just trying to get all the bugs out of her first!

 

[reaper]

This isn't normal at all... I'd get those brakes checked right away!

 

[LagunaH1]

2) When stepping on the brake pedal I hear a pop sound. Like a heat shield making a pop, or if you bend thin metal and it makes that boing sound when it goes back to shape. Really hard to explain the sound. Coming from engine compartment area.

3) My seat makes a clicking sound when going around corners or putting pressure on the seat. I can make it do it when sitting in the seat and pushing on the back of the seat with my feet on the floorboards. Not sure what it is...

The click *could* be one of your brake lines having dislodged itself from one of the little plastic clips that are supposed to hold them in place in the engine compartment. My '08 H3 did that fairly often.

The seat clicking could be something as simple as something needing to be tightened

 

[alrock]

The brake line runs across the firewall in the engine compartment and can come loose from the clips. I would definitely check out the rear brakes - might just need new pads.

 

[2007HummerH2]

Update:

Checked the brakes...all pads are in great shape. Cleaned them up with some brake cleaner and the grinding noise is gone. I think just from sitting the rear brakes got glazed and started to make that terrible noise. I found the TSB on another site, and all they do is clean them, turn-down the rotor and put the brakes back together again....nothing that I couldn't do myself, and there was no reason to turn-down the rears. Been driving on them the last 3 days and all is good.

On the other hand, I have to do some checking on the weird noise I hear when braking. I'll definitely check the brake lines that run on the firewall...see if they are still attached.
I did notice that this noise only happens when I'm driving in the city in stop and go traffic/or parking. Driving 45mph on back roads all is well.
Just hear a thunk/boing noise and can feel it in the brake pedal. Sounds like a heat shield popping. Once I get back home gonna let it cool off then do some investigating. Never noticed this noise until after the new rear springs were installed. Maybe something to do with the emergency brake?

 

[GoBlueHummer]

If I remember correctly, the H3's that had the steering shaft issue made a popping sound when you applied the brakes. I believe there is a TSB on it.

 

[4speedfunk]

If you wheel it often...sometimes you can get chunks of dried mud, pea-gravel, and small rocks lodged in behind the backing plates (between the rotors and the plates). It makes a horrendous scraping noise, and usually you can put it in reverse, back-up about twenty feet, and the problem will go away. We got lots of deep mud around the midwest and taking apart the brake system and cleaning everything is not unusual. Stark contrast from desert wheeling, where its dry most of the time. I'm jealous.

 

[2007HummerH2]

UPDATE:
well I found out what the noise is when stepping on the brake pedal. If you look up at the brake pedal lever that is under the dash, up above where the steering wheel assembly is, you can see a spring. I believe it is the return spring for the pedal. It was that which was making the sound.
I'm not sure, but this spring has graphite grease all over it.......is that normal? Or did someone mess around with it....possibly a problem before?

 

[06 H3]

Stark contrast from desert wheeling, where its dry most of the time. I'm jealous.

Come out west next summer! I will have my 4:1 case by then. Bebe can lead us through the rubicon. It would be a first to have 3 sprung over H3s on a trail together

 

[alrock]

I'll try and take a look tomorrow, haven't checked out that spring.