Advice Appreciated

Jason370 · 02-28-2011, 08:55 AM

This concerns my stock 2009 Nismo with 10,000 miles. For the past several weeks, I have noted a clunking-like noise eminating from the rear as the car comes to a stop when braking. The noise appears only when the car's forward momentum shifts backward as it comes to a complete stop. If the car comes to a very gentle stop with little weight transfer, the noise is not evident.
Naturally, I brought the car to my local dealer where it remained overnight for evaluation. They concluded that said noise resulted from a slight glazing of the left rear brake rotor and could find no other explanation.
Does this sound reasonable?

spearfish25 · 02-28-2011, 09:00 AM

Unlikely. Unless you really hear it localized there, I can't imagine how a 'glazed rotor' would make a clunking sound.

I'd look more closely at your rear suspsension including sway bar and potentially the rear diff.

TypeOne · 02-28-2011, 09:13 AM

^^^ Same thing I thought.

It would be interesting to hear how one rotor alone got "glazed."

I would think that some sort of suspension component would be the cause of that noise. I know the rear end of my STi would clunk around, but that was because the rear end bushings were way too soft.

Did they fix the problem by replacing a rotor? What are they telling you?

LunaZ · 02-28-2011, 09:31 AM

Check the parking brake adjustment.
Mine made a noise like you're describing after I installed my spacers. I realized I had loosened up the adjuster/tensioner for the brake shoes during my install.
This could be the source of your noise, too.

ProfessorDave · 02-28-2011, 09:36 AM

I vote sway bar based on the circumstances you described. Get it checked and keep us posted!

Jason370 · 02-28-2011, 09:40 AM

Quote:

Originally Posted by TypeOne

^^^ Same thing I thought.

It would be interesting to hear how one rotor alone got "glazed."

I would think that some sort of suspension component would be the cause of that noise. I know the rear end of my STi would clunk around, but that was because the rear end bushings were way too soft.

Did they fix the problem by replacing a rotor? What are they telling you?

Dealer claimed rotor does not require replacement and offered no other explanation.

Jason370 · 02-28-2011, 09:41 AM

Quote:

Originally Posted by ProfessorDave

I vote sway bar based on the circumstances you described. Get it checked and keep us posted!

Will do.
Many thanks to those taking the time and trouble of answering.

optiontrader · 02-28-2011, 11:29 PM

I'm with suspension here as well.

Our beater (del Sol) clunks like Chitty-Chitty-Bang-Bang in the back - all the bushings are spent. However, it's not only braking, it's just going down a bumpy road (plenty here in SoCal). I'm going to redo them, but I gotta get this house finished up first...

kenchan · 03-01-2011, 08:11 AM

Also ck if your spare is loose. Or anything in the trunk.

trent1331 · 03-01-2011, 09:53 AM

I used to have my spare lug-nuts in a ziplock bag rolling around in the trunk with my spare tire..

Made a lot of clunking when coming to a stop, lol.

Have you checked for stuff in there?

02-28-2011, 08:55 AM	#1 (permalink)
Jason370 Base Member Join Date: Feb 2011 Location: Bradenton, Fl Posts: 19 Drives: 370Z Nismo Rep Power: 14	Advice Appreciated This concerns my stock 2009 Nismo with 10,000 miles. For the past several weeks, I have noted a clunking-like noise eminating from the rear as the car comes to a stop when braking. The noise appears only when the car's forward momentum shifts backward as it comes to a complete stop. If the car comes to a very gentle stop with little weight transfer, the noise is not evident. Naturally, I brought the car to my local dealer where it remained overnight for evaluation. They concluded that said noise resulted from a slight glazing of the left rear brake rotor and could find no other explanation. Does this sound reasonable?

02-28-2011, 09:00 AM	#2 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Unlikely. Unless you really hear it localized there, I can't imagine how a 'glazed rotor' would make a clunking sound. I'd look more closely at your rear suspsension including sway bar and potentially the rear diff. __________________ 2013 Cadillac V-Wagon, RIP Z

02-28-2011, 09:31 AM	#4 (permalink)
LunaZ A True Z Fanatic Join Date: Mar 2010 Location: Vagabond Posts: 6,704 Drives: Project: a white one Rep Power: 512	Check the parking brake adjustment. Mine made a noise like you're describing after I installed my spacers. I realized I had loosened up the adjuster/tensioner for the brake shoes during my install. This could be the source of your noise, too. __________________ 2009 370Z Sport/Touring/Navigation \| see my journal for mods facebook: Be my friend... or not.

02-28-2011, 09:36 AM	#5 (permalink)
ProfessorDave A True Z Fanatic Join Date: Jul 2010 Location: Scranton, PA Posts: 1,580 Drives: In the fairway Rep Power: 19	I vote sway bar based on the circumstances you described. Get it checked and keep us posted! __________________ Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB Everything else: 2009 370z, PW Touring 6MT

02-28-2011, 11:29 PM	#8 (permalink)
optiontrader Track Member Join Date: Jul 2010 Location: Smog Hell, SoCal Posts: 595 Drives: 40th Rep Power: 16	I'm with suspension here as well. Our beater (del Sol) clunks like Chitty-Chitty-Bang-Bang in the back - all the bushings are spent. However, it's not only braking, it's just going down a bumpy road (plenty here in SoCal). I'm going to redo them, but I gotta get this house finished up first... __________________ 40th Anniversary Z - 3M Paint Protection Film, CA Legal Tint! (70/40)

02-28-2011, 09:13 AM	#3 (permalink)
TypeOne A True Z Fanatic Join Date: Jul 2010 Location: Baton Rouge, LA Posts: 2,682 Drives: BSM 370 Rep Power: 1851	^^^ Same thing I thought. It would be interesting to hear how one rotor alone got "glazed." I would think that some sort of suspension component would be the cause of that noise. I know the rear end of my STi would clunk around, but that was because the rear end bushings were way too soft. Did they fix the problem by replacing a rotor? What are they telling you?

03-01-2011, 08:11 AM	#9 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	Also ck if your spare is loose. Or anything in the trunk.

03-01-2011, 09:53 AM	#10 (permalink)
trent1331 Base Member Join Date: Aug 2009 Location: Fayetteville, AR Posts: 164 Drives: 09 370z MB M6 Rep Power: 16	I used to have my spare lug-nuts in a ziplock bag rolling around in the trunk with my spare tire.. Made a lot of clunking when coming to a stop, lol. Have you checked for stuff in there?

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