Notices
Series I Trouble Shooting This is the place to learn more about or discuss any issues you're having with your RX-8

Getting strange knocking from rear brakes....

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 11-02-2008, 05:30 PM
  #1  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
Getting strange knocking from rear brakes....

It is fine during high speed braking. It only seems to make noise right when I let off the brake pedal at very low speeds as when stopping. It makes a very low frequency "pop" sound as I let off the pedal. It does not sound like a pad problem as there is no squealing.

The only thing I did recently was installed speed bleeders, bled the lines, and installed 17' winter wheels. The MC did accidentally go dry (i was looking from the driver side and not from the front and was staring at a full clutch fluid level). I bled the MC and everything seems fine regarding pressure.

FYI I did degrease and sand the wheel hub mounting surface already to no avail.

I'm thinking maybe it has something to do with air getting into the ABS system???
Old 11-02-2008, 05:37 PM
  #2  
Registered
iTrader: (7)
 
invasion08's Avatar
 
Join Date: Nov 2003
Location: New jersey
Posts: 2,079
Likes: 0
Received 2 Likes on 2 Posts
well if they was air in the system your brake pedal would feel soft
Old 11-02-2008, 05:59 PM
  #3  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
Nope brakes feel fine and firm, so I guess that's not the problem.

What else could it be narrowed down to?
Old 11-02-2008, 06:02 PM
  #4  
Registered
iTrader: (7)
 
invasion08's Avatar
 
Join Date: Nov 2003
Location: New jersey
Posts: 2,079
Likes: 0
Received 2 Likes on 2 Posts
Did you replace the pads and rotors or just the pads? And if so what brand did you buy
Old 11-02-2008, 06:07 PM
  #5  
Owner of BHR
iTrader: (7)
 
Charles R. Hill's Avatar
 
Join Date: Nov 2003
Posts: 4,101
Received 45 Likes on 32 Posts
Check your wheel torque as there is a TSB for a similar "low-speed snapping sound" on the front wheels and this one sounds too familiar to overlook the similarities. Also check to be sure that all 4 tires are the same diameter and wear as it might cause issues with the ABS otherwise.
Old 11-02-2008, 06:32 PM
  #6  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
Never replaced the pads, just cleaned the backing plates and added some brake-noise product at the areas specified in the brake squeal TSB.

Also lubed the slider pins, and bolted everything back up.

I also torqued the wheels to 108 ft lbs as per TSB and cleaned the wheel hubs.

Its driving me nuts as I have done all the work meticulously and I still can't locate the noise. I have had the wheels off twice now looking for a source of the noise.
Old 11-03-2008, 01:11 AM
  #7  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
Would the need for hub-centric rings cause this symptom? They are aftermarket wheels after all.
Old 11-03-2008, 03:12 AM
  #8  
Zoom-Freakin'-Zoom
iTrader: (5)
 
swoope's Avatar
 
Join Date: Jan 2004
Location: orlando, fl
Posts: 14,602
Received 35 Likes on 31 Posts
calipers are not tight..

beers
Old 11-04-2008, 10:43 PM
  #9  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
checked the calipers and all the pad mounting hardware

beginning to think its just the pads shifting around, maybe i need some new brake shims
Old 11-08-2008, 02:07 AM
  #10  
Registered
Thread Starter
 
byez's Avatar
 
Join Date: Oct 2008
Location: Alberta, Canada
Posts: 145
Likes: 0
Received 0 Likes on 0 Posts
UPDATE: It was not the brakes after all. I did a inspection of the rear suspension bolts and tightening them as I went along.

One of the suspension arm bolts was loose about half an inch. Tightened everything back up and everything is back to normal including my sanity. Strange as the car is completely unmodified and the suspension has never been touched.

Has anybody else experienced any loose bolts and which ones have loosened? If someone can post up a pic of the rear suspension I can pinpoint exactly which one came loose.

Hope this helps someone in the future.
Old 11-08-2008, 03:36 PM
  #11  
I8U
Registered
iTrader: (1)
 
I8U's Avatar
 
Join Date: May 2006
Location: Carolina Beach, NC
Posts: 1,934
Likes: 0
Received 0 Likes on 0 Posts
A dollar says it was an endlink bolt...I recently added locktight to my endlink bolts.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
nowakm99
Series II Technical and Trouble shooting
1
10-09-2015 07:10 AM
Steve Dallas
RX-8 Racing
10
10-07-2015 10:30 AM
Hiroshima_RX
Series I Trouble Shooting
3
09-21-2015 06:28 PM
yankeepicker
Series I Trouble Shooting
3
09-11-2015 05:42 PM
rxwilly8
New Member Forum
1
09-02-2015 02:42 PM



You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Getting strange knocking from rear brakes....



All times are GMT -5. The time now is 10:33 AM.