More problems

Nick119

10/17/2007 6:15:23 PM

Well first the good thing, I got my steering shaft replaced and it seems no more problems or front-end rattle with that. I also got my 3,000 mile oil change. Now it seems that when im slowing down and i get down to a very low speed i hear this I guess grinding type noise in the back when im brakeing. Like if I brake when I'm going 60mph I won't hear it until im down below 15-20. It's really weird and it's only in the rear of the car. I've been to the dealer 2 consecutive weeks now, and quite frustrated because the car is brand new only 3400 miles on it. I'm just tired of goign back and forth to the dealer. Anyone else having similar problems?

hilljob26

10/17/2007 6:37:52 PM

i wonder if a shoe isnt hangin up,like a bad wheel cylinder,they can be bad,even new ones

Doc Olds

10/17/2007 7:16:05 PM

Nick: try reading this thread H3 brakes problem and this link posted by a member here f5fstop at another forum, he knows his stuff.

Brakes Grunt, Groan, in Rear
Subject: Brakes Grunt, Groan, Grinding Noise from Rear When Vehicle Comes to a Stop (Refinish Rear Rotors) #07-05-23-004 - (09/26/2007)
Models: 2006-2008 HUMMER H3
Condition
Some customers may comment on a grunt, groan or grinding noise coming from the rear of the vehicle when coming to a stop.
Cause
Rotor corrosion generates a slip-stick condition transferring vibration through the suspension.
REPLACE THE ROTORS ONLY IF THE ROTOR THICKNESS IS BELOW THE MINIMUM THICKNESS SPEC AFTER REFINISH.
Correction
Refinish the rear rotors by removing 0.4 mm from both rear rotor surfaces.
Do not replace the brake pads unless the condition requires it (i.e. excessively worn, damaged, or contaminated).
If the noise persists, a brake dampening compound may be applied to the back of each pad. This allows parts to slide freely and not vibrate when moving relative to each other.

Print this and take it with ya to your dealership and show them the GM Service Bulletin number in bold above (TSB#), tell em Doc sent ya.

D VADER

10/18/2007 3:02:41 AM

quote:

ORIGINAL: Doc Olds

Nick: try reading this thread H3 brakes problem and this link posted by a member here f5fstop at another forum, he knows his stuff.

Brakes Grunt, Groan, in Rear
Subject: Brakes Grunt, Groan, Grinding Noise from Rear When Vehicle Comes to a Stop (Refinish Rear Rotors) #07-05-23-004 - (09/26/2007)
Models: 2006-2008 HUMMER H3
Condition
Some customers may comment on a grunt, groan or grinding noise coming from the rear of the vehicle when coming to a stop.
Cause
Rotor corrosion generates a slip-stick condition transferring vibration through the suspension.
REPLACE THE ROTORS ONLY IF THE ROTOR THICKNESS IS BELOW THE MINIMUM THICKNESS SPEC AFTER REFINISH.
Correction
Refinish the rear rotors by removing 0.4 mm from both rear rotor surfaces.
Do not replace the brake pads unless the condition requires it (i.e. excessively worn, damaged, or contaminated).
If the noise persists, a brake dampening compound may be applied to the back of each pad. This allows parts to slide freely and not vibrate when moving relative to each other.

Print this and take it with ya to your dealership and show them the GM Service Bulletin number in bold above (TSB#), tell em Doc sent ya.

HUMMER DRIVER

10/18/2007 5:06:59 AM

That's why they call him DOC! Bravo Doc! Great info.

Has anyone bought the aftermarket drilled rotors for their Hummer, I'm seeing them more and more on ebay and other places. Personally I think the H3 brakes are pretty good. The H3 is heavy and my brakes work great. I rent a lot of cars/SUVs while traveling and some brakes are either too sensitive or weak, the Hummer feels just right and really brings my big ole truck to a dead stop when I need it. Touch wood, no problems with mine so far and I've got 14K miles on mine.

Years ago I had a Grand Cherokee and it had the worst rotors, must have been Chrysler made, I had them turned twice before 40K miles and then at 60K I had to replace them. The next year Jeep offered a recall on those rotors because they warped and wore unevenly and you get that hard bumping when hitting the brakes.

Doc Olds

10/18/2007 5:39:19 AM

quote:

ORIGINAL: D VADER

I re-read that Doc..how do you apply anything to the "back" of a pad?

You can apply caliper pin grease to the back of the pad where it makes contact with the caliper piston (kinda the middle area). DO NOT get any on the front. If it was rattling/vibrating/chattering and making noise it will often quiet it down or stop it. Same stuff you lubricate the sliders/pins with.

Credit goes to f5fstop, he posted the TSB elsewhere, but you can always search the TSBs from GM.

Doc Olds

10/18/2007 5:48:16 AM

quote:

ORIGINAL: HUMMER DRIVER

Has anyone bought the aftermarket drilled rotors for their Hummer, I'm seeing them more and more on ebay and other places. Personally I think the H3 brakes are pretty good. The H3 is heavy and my brakes work great. I rent a lot of cars/SUVs while traveling and some brakes are either too sensitive or weak, the Hummer feels just right and really brings my big ole truck to a dead stop when I need it. Touch wood, no problems with mine so far and I've got 14K miles on mine.

Years ago I had a Grand Cherokee and it had the worst rotors, must have been Chrysler made, I had them turned twice before 40K miles and then at 60K I had to replace them. The next year Jeep offered a recall on those rotors because they warped and wore unevenly and you get that hard bumping when hitting the brakes.

The H3 has adequate brakes right out of the box. A noted weakness on many prior GM trucks. They actually got them right this time!

There was a thread a while back on cross drilled slotted rotors, but I haven't seen anybody fess up to spending dough on that mod yet?? Drilled Slotted Rotors