What could this be? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
Go Back   Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum > Technical / Performance / Model > Mazda 6 1st Generation (2002-2008) > Mazdaspeed6
New User? Register
Mazda6Club.com is the premier Mazda 6 Forum on the internet. Registered Users do not see the above ads.
User Tag List

Reply
 
LinkBack Thread Tools
Old 01-19-2013, 06:49 PM   #1 (permalink)
Registered User
 
Emew's Avatar
 
Join Date: Mar 2012
Location: TC, MI
Posts: 752
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Thanks: 195
Thanked 143 Times in 119 Posts
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 2 reviews
Default What could this be?

So I have discussed in my tune thread, and also with @SonicNutrition how my Speed seems to within the first 3-4 miles make a decently audible pop noise when coming to a stop after driving from cold boot. The pop does not reoccur this is a 1 time instance upon every cold boot session. My local mechanic drove it and said if I am not seeing anything on my AP logs, to forget it and that it can't be anything huge. I recently described the situation to Sonic and he says potentially my master cylinder. Upon inspection from his recommendation, I have noticed the brake fluid is at the 1/2 way point. So my question would be, and the point of this post. What may be going wrong, or what actions should I take next/look into?

Conditions:
1. Cold Boot
2. 3-4 miles driving.
3. Pop heard from center console vicinity upon braking to a stop.

Heat on or off has no effect on the occurrence and again the problem does not come back after the initial pop upon braking from a cold boot state.

As usual, all input is appreciated!
__________________
Flow Tuned
Some car that has way too much money in MODs.
Emew is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-19-2013, 07:30 PM   #2 (permalink)
Registered User
 
Dirk McGurck's Avatar
 
Join Date: Sep 2011
Location: Delaware
Posts: 774
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 121 Post(s)
Thanks: 171
Thanked 168 Times in 128 Posts
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 1 reviews
Default

I'm getting small backfires on these cold days, could it be something like that?
__________________
2009 Nissan 370Z Touring with Sport

2007 Mazdaspeed 6 GT 09241 "Ducky" + Bolt-ons. Sold, but lives on with a new owner.

Check out the For Sale sections for my used Mazdaspeed 6 parts.
Dirk McGurck is offline   Reply With Quote Quick reply to this message
Old 01-19-2013, 08:16 PM   #3 (permalink)
Registered User
 
Emew's Avatar
 
Join Date: Mar 2012
Location: TC, MI
Posts: 752
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Thanks: 195
Thanked 143 Times in 119 Posts
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 2 reviews
Default Re: What could this be?

I was thinking something like that but thought it would show in AP logs if that were the case. Could be though.

Sent from my dial up phone
__________________
Flow Tuned
Some car that has way too much money in MODs.
Emew is offline   Reply With Quote Quick reply to this message
Old 01-20-2013, 08:36 AM   #4 (permalink)
Registered User
 
jm211's Avatar
 
Join Date: Oct 2011
Location: Wausau, Wi
Posts: 1,281
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 208 Post(s)
Thanks: 652
Thanked 320 Times in 272 Posts
Groans: 12
Groaned at 4 Times in 3 Posts
iTrader: 0 reviews
Default

If you fluid is low, it went somewhere.

You are at, may I assume 60,000-90,000 miles. At that age, it is likely your master cylinder and/or system is leaking, albeit slowly as your note seeing any leak; this is quite normal.

I would recommend, at this time anyways to replace your master cylinder (located under you fill hole), your slave cylinder, your choice brake fluid and pick up a stainless steel clutch line for good measure.

It is in your interest to go OEM for the cylinders, or rebuild.

http://onlinemazdaparts.com for your OEM parts

http://www.edgeautosport.com/techna-...utch-line-ms6/ for you SS clutch line

http://support.corksport.com/instruc...LUTCH-LINE.pdf - Replacing to SS clutch line.


I have the service manual if you need it. 1000 pages of How-To's from Mazda.
__________________
Black Mica 2006 Speed6 GT | 60,000 Miles
Cobb AP | Stage 1 | JBR Stage II Intake - Blue | CP-e Exhaust | JBR RMM | SURE Shortcut | SURE Return | SURE Anchors | SURE AGS 625g Shift Knob | All Amsoil Fluids | Forge V1

I'm Registered. Are You? www.Ms6db.com


"I would happily admit to anybody that the Mazdaspeed6 should come with a warning label..."
-TiGraySpeed6

Last edited by jm211; 01-20-2013 at 08:57 AM.
jm211 is online now   Reply With Quote Quick reply to this message
Old 01-21-2013, 07:24 AM   #5 (permalink)
Registered User
 
Emew's Avatar
 
Join Date: Mar 2012
Location: TC, MI
Posts: 752
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Thanks: 195
Thanked 143 Times in 119 Posts
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 2 reviews
Default Re: What could this be?

I think it's definitely the master cylinder or related to it. I attached a picture from september when I got my new intake, the brake fluid is over the max line. Yesterday? Half empty below max.

Sent from my dial up phone
Attached Thumbnails
What could this be?-uploadfromtaptalk1358770962163.jpg  
__________________
Flow Tuned
Some car that has way too much money in MODs.
Emew is offline   Reply With Quote Quick reply to this message
Old 01-21-2013, 10:05 AM   #6 (permalink)
Registered User
 
Join Date: Apr 2011
Posts: 557
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Thanks: 41
Thanked 119 Times in 99 Posts
Groans: 6
Groaned at 2 Times in 2 Posts
iTrader: 0 reviews
Default

Where does it sound like it is coming from? I've been working on cars a long time and never come across a pop under stopping that came from a master cylinder. 6's are somewhat known for the lower control arms needing to be replaced...
__________________
07' Speed6 Velocity Red Mica

Go Faster: CorkSport SRI/TIP, SU Test Pipe, Autotech Internals, IVT22's, Cobb AP
Anti break stuff: SURE Dreadnaught, TorqR6 RMM
Appearence: STRI DSD Boost Guage/Blockhead 60mm Guage Pod, Snow tire/wheels mod for the effin' snow
scubasteve711 is offline   Reply With Quote Quick reply to this message
Old 01-21-2013, 12:54 PM   #7 (permalink)
Registered User
 
Final Impact's Avatar
 
Join Date: Sep 2012
Location: USA, OR
Posts: 2,628
Mentioned: 100 Post(s)
Tagged: 1 Thread(s)
Quoted: 521 Post(s)
Thanks: 1,108
Thanked 844 Times in 605 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 0 reviews
Default

As the pads wear the fluid will drop so it not unusual to see the fluid down and NOT be a fluid leak. Why it would go up and down so much is beyond me unless its the level being checked and the difference in temperature.

As for the noise itself; from cold with high idle it could have a tad more vacuum. Could more vacuum assist be related to the noise? Something that happens once per start up cycle is indeed strange. Can you describe it with more detail perhaps?
__________________
2006 Mazda 6s GS Hatchback, Lapis Blue | AJ 3.0 & AW6A-EL 6 Spd, >101,000

__________________________________________________ __________________
V6 repair info here: FSM, MIL/CEL codes, P030X solved, Links to V6 threads
Final Impact is offline   Reply With Quote Quick reply to this message
Old 01-21-2013, 03:38 PM   #8 (permalink)
Registered User
 
IHeartGroceries's Avatar
 
Join Date: Jan 2007
Location: Fort Worth, TX
Posts: 5,305
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 194 Post(s)
Thanks: 1,274
Thanked 1,231 Times in 773 Posts
Groans: 3
Groaned at 8 Times in 8 Posts
iTrader: 0 reviews
Default

Quote:
Originally Posted by Final Impact View Post
As the pads wear the fluid will drop so it not unusual to see the fluid down and NOT be a fluid leak. Why it would go up and down so much is beyond me unless its the level being checked and the difference in temperature.

As for the noise itself; from cold with high idle it could have a tad more vacuum. Could more vacuum assist be related to the noise? Something that happens once per start up cycle is indeed strange. Can you describe it with more detail perhaps?
Indeed! As pads wear, more fluid is displaced in the caliper bores. So, it wouldn't be unusual to see level drop over a period of time.

You should feel something in the pedal, and likely lose brake performance if the MC wasn't functioning correctly. I can't think of what would pop either, unless a piston is getting hung or something.

I have a very similar sound occur randomly in my car. Has done it for a while now. However, mine seems directly correlated with the HVAC system. For example, I might turn the defrost on, and after it has been running for a couple minutes, I hear a thud from behind the HVAC bezel. Sometimes, I will have had the system on, then off again, and when I brake, the centrifugal forward force from braking will result in the popping sound. I decided it was the vent behind the dash sticking for some reason, and I pretty much ignore it now.
IHeartGroceries is offline   Reply With Quote Quick reply to this message
Old 01-21-2013, 04:00 PM   #9 (permalink)
Registered User
 
Final Impact's Avatar
 
Join Date: Sep 2012
Location: USA, OR
Posts: 2,628
Mentioned: 100 Post(s)
Tagged: 1 Thread(s)
Quoted: 521 Post(s)
Thanks: 1,108
Thanked 844 Times in 605 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 0 reviews
Default

Quote:
Originally Posted by Final Impact View Post
As the pads wear the fluid will drop so it not unusual to see the fluid down and NOT be a fluid leak. Why it would go up and down so much is beyond me unless its the level being checked and the difference in temperature.

As for the noise itself; from cold with high idle it could have a tad more vacuum. Could more vacuum assist be related to the noise? Something that happens once per start up cycle is indeed strange. Can you describe it with more detail perhaps?
Should have said: "Why it would go up and down so much is beyond me unless its changed by HOW level the vehicle is when its checked and the difference in temperature.

O/T: Anyone with Auto Climate control have whistle through the core of the HVAC when the temperature reaches the set temp? Example: set at 77F and as the cabin is fully warmed to 77F, it whistles. Less fan, less whistle, more fan more whistle - adding vehicle speed adds even more! Move dial to colder or hotter and it stops until it hits the new set point. A volume of 12 on the Bose Radio will drown it out somewhat. lol


OP Just curious; have you looked under the dash for cracks around the clutch pedal and brake mount? I think its unlikely but for know you have go for what it "isn't vs what it is!"
__________________
2006 Mazda 6s GS Hatchback, Lapis Blue | AJ 3.0 & AW6A-EL 6 Spd, >101,000

__________________________________________________ __________________
V6 repair info here: FSM, MIL/CEL codes, P030X solved, Links to V6 threads
Final Impact is offline   Reply With Quote Quick reply to this message
Old 01-21-2013, 05:43 PM   #10 (permalink)
Registered User
 
oh_yeams6's Avatar
 
Join Date: Nov 2010
Location: Dallas
Posts: 2,424
Mentioned: 24 Post(s)
Tagged: 1 Thread(s)
Quoted: 209 Post(s)
Thanks: 344
Thanked 762 Times in 523 Posts
Groans: 6
Groaned at 5 Times in 5 Posts
iTrader: 17 reviews
Default

Quote:
Originally Posted by IHeartGroceries View Post
Indeed! As pads wear, more fluid is displaced in the caliper bores. So, it wouldn't be unusual to see level drop over a period of time.

You should feel something in the pedal, and likely lose brake performance if the MC wasn't functioning correctly. I can't think of what would pop either, unless a piston is getting hung or something.

I have a very similar sound occur randomly in my car. Has done it for a while now. However, mine seems directly correlated with the HVAC system. For example, I might turn the defrost on, and after it has been running for a couple minutes, I hear a thud from behind the HVAC bezel. Sometimes, I will have had the system on, then off again, and when I brake, the centrifugal forward force from braking will result in the popping sound. I decided it was the vent behind the dash sticking for some reason, and I pretty much ignore it now.
I thought the thud was from animals dying of heat or cold, and then hitting the back of your face plate when they come through the ventilation system?
__________________
Sold my MS6 10.30.13

Guide to Preventative Maintenance and Modding
DIY FMIC for $220
oh_yeams6 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 09:07 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2