Master Cylinder Leak - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

OC ZL1 · 01-23-2013, 09:44 PM

Has anyone with a 2013 ZL1 had a leaking Brake Master Cylinder?

I noticed a fair amount of fluid today on my reservoir. I know there were older posts for this, but wanted to know if others have had this on their new ZL1s and had a dealer successfully repair. I only have about 300 miles on my car.

Sorry no pics as I saw this while at work and didn't want to drive home with fluid on top.

I'd rather fix myself than have the dealer work on my car if it is just a cap replacement.

NightmareZL1 · 01-23-2013, 11:10 PM

I have had the same issue since day one. Actually I have had this happen on all the corvettes I have had from 1992 and up. Crappy GM design.

2ss-booya · 01-24-2013, 12:47 AM

They all leak...both SS's I had leaked...its a faulty design. I think theres a thread somewhere around here where a member used a bottle cap ring and fixed the leak?

Edit:

These links might help

http://www.camaro5.com/forums/showth...r+cylinder+fix

http://www.camaro5.com/forums/showth...der+cap+recall

http://www.camaro5.com/forums/showthread.php?t=175467

Chevrolet Customer Svc · 01-24-2013, 08:18 AM

Quote:

Originally Posted by OC ZL1

Has anyone with a 2013 ZL1 had a leaking Brake Master Cylinder?

I noticed a fair amount of fluid today on my reservoir. I know there were older posts for this, but wanted to know if others have had this on their new ZL1s and had a dealer successfully repair. I only have about 300 miles on my car.

Sorry no pics as I saw this while at work and didn't want to drive home with fluid on top.

I'd rather fix myself than have the dealer work on my car if it is just a cap replacement.

It sounds like you may be under warranty still so I would suggest going to the dealership for a diagnosis and repair.

Brandon
Chevrolet Customer Service

OC ZL1 · 01-24-2013, 08:29 PM

Quote:

Originally Posted by 2ss-booya

They all leak...both SS's I had leaked...its a faulty design. I think theres a thread somewhere around here where a member used a bottle cap ring and fixed the leak?

Edit:

These links might help

http://www.camaro5.com/forums/showth...r+cylinder+fix

http://www.camaro5.com/forums/showth...der+cap+recall

http://www.camaro5.com/forums/showthread.php?t=175467

I saw the older posts, but they were a year old. I was hoping that someone had an effective warranty repair on a 2013, so I could know the new P/N.

2ss-booya · 01-24-2013, 08:30 PM

As far as I know, even the new GM cap still leaks...Hopefully someone else can chime in and prove me wrong

buffetfn1 · 01-25-2013, 10:45 AM

The dealer replaced the entire reservoir on mine about 3 months ago. No more issues to date...mine is a 12

RiCorvette · 01-25-2013, 01:50 PM

My 2013 leaks - I did the separate Clutch Reservoir and put extra plastic gaskets in the Break Reservoir's cap.

GoldenBear · 01-25-2013, 02:07 PM

I noticed some slight weeping of brake fluid on the master cylinder reservoir on my 2013 Convertible, supposedly due to the reservoir cap not making a good seal with the reservoir. I did notice that when the reservoir cap was rotated all the way to the closed detent position there was some play between the cap and the reservoir. I obtained a new reservoir cap under warranty and the new cap fits tightly now when rotated all the way to the closed detent position and I haven't noticed any further brake fluid on the master cylinder reservoir.

There is a TSB (09-05-22-005A) on the reservoir cap but many Camaro owners have indicated that replacing the cap has not resolved the issue while others, as I, have found that a new cap solves the problem for them. It appears that a slight difference in cap seal thickness (probably within the specified tolerances) makes the difference between leaking and not leaking.

OC ZL1 · 01-25-2013, 03:16 PM

Quote:

Originally Posted by GoldenBear

I noticed some slight weeping of brake fluid on the master cylinder reservoir on my 2013 Convertible, supposedly due to the reservoir cap not making a good seal with the reservoir. I did notice that when the reservoir cap was rotated all the way to the closed detent position there was some play between the cap and the reservoir. I obtained a new reservoir cap under warranty and the new cap fits tightly now when rotated all the way to the closed detent position and I haven't noticed any further brake fluid on the master cylinder reservoir.

There is a TSB (09-05-22-005A) on the reservoir cap but many Camaro owners have indicated that replacing the cap has not resolved the issue while others, as I, have found that a new cap solves the problem for them. It appears that a slight difference in cap seal thickness (probably within the specified tolerances) makes the difference between leaking and not leaking.

I had more then weeping.

In my case it was wet enough that there were multiple fluid runs on the shock tower. I think that I'll try the mod with a plastic shim under the original reservoir cap to see if it is effective. That would certainly reduce the clearance. If that doesn't work I'll take to a dealer.

Godsplumber · 01-30-2013, 09:53 AM

There is a fixiit bulletin on this at the dealers, the cap needs replaced. They did mine.

FINALLYSATISFIED · 01-30-2013, 10:42 AM

Anyone have the bulletin?

RiCorvette · 01-30-2013, 10:45 AM

Here's the older version. I'm sure we'd all like to know if it's been updated and revised.

TECHNICAL
Bulletin No.: 09-05-22-005A
Date: March 05, 2010
Subject: Slight Brake Fluid Leak/Weeping Around Master Cylinder Reservoir Cap (Replace Cap)
Models:
2010 Chevrolet Camaro
Built Prior to VIN Breakpoint A9197567
Supercede:
This bulletin is being revised to add a VIN breakpoint. Please discard Corporate Bulletin Number 09-05-22-005 (Section 05 - Brakes).
Condition
Some customers may comment on noticing that the brake master cylinder reservoir cap has a slight leak or is weeping brake fluid.
Cause
This condition may be caused by insufficient sealing of the reservoir cap.
Correction

Replace the master cylinder reservoir cap following the steps below:
1. Remove and discard the original reservoir cap.
Note
If in question on brake fluid or level, refer to Master Cylinder Reservoir Filling, in SI.
2. Check the brake fluid level. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions.
3. Wipe clean the outside surface of the master cylinder and/or reservoir.
4. Install a new reservoir cap, GM P/N 20819283.

Ref:
http://www.camaro5.com/forums/showth...35#post6101235

Post # 8

CAM....ZL1 · 01-30-2013, 12:59 PM

One solution would be. And this what i am gonna do is buy a replacement
cap and pull the gasket from one and double the other.
I have ordered carbon fiber fluid caps for all fluid resivors
and will use the OEM gasket to double the replacement cap
gasket which is also OEM.

01-23-2013, 09:44 PM	#1
OC ZL1 Drives: 2013 ZL1 AGM Join Date: Mar 2012 Location: OC California Posts: 153	Master Cylinder Leak Has anyone with a 2013 ZL1 had a leaking Brake Master Cylinder? I noticed a fair amount of fluid today on my reservoir. I know there were older posts for this, but wanted to know if others have had this on their new ZL1s and had a dealer successfully repair. I only have about 300 miles on my car. Sorry no pics as I saw this while at work and didn't want to drive home with fluid on top. I'd rather fix myself than have the dealer work on my car if it is just a cap replacement. __________________ OC ZL1

01-23-2013, 11:10 PM	#2
NightmareZL1 Can't stop ***ifying Drives: Ashen 2013 Gray ZL1 Join Date: Dec 2012 Location: Honolulu, HI Posts: 273 View My Garage	same here I have had the same issue since day one. Actually I have had this happen on all the corvettes I have had from 1992 and up. Crappy GM design.

01-25-2013, 02:07 PM	#9
GoldenBear Bear Backer Drives: 69 Camaro Z/28, 69 Corvette Conv Join Date: Jan 2011 Location: San Jose, CA Posts: 1,490	I noticed some slight weeping of brake fluid on the master cylinder reservoir on my 2013 Convertible, supposedly due to the reservoir cap not making a good seal with the reservoir. I did notice that when the reservoir cap was rotated all the way to the closed detent position there was some play between the cap and the reservoir. I obtained a new reservoir cap under warranty and the new cap fits tightly now when rotated all the way to the closed detent position and I haven't noticed any further brake fluid on the master cylinder reservoir. There is a TSB (09-05-22-005A) on the reservoir cap but many Camaro owners have indicated that replacing the cap has not resolved the issue while others, as I, have found that a new cap solves the problem for them. It appears that a slight difference in cap seal thickness (probably within the specified tolerances) makes the difference between leaking and not leaking. __________________ Current Chevrolets: 1969 Camaro Z/28 -- 1969 427/390 Corvette Convertible -- 1970 350/300 Corvette Convertible -- 2013 Camaro ZL1 Convertible -- CRT / Exposed CF Weave Hood Insert / Suede Package / Polished Wheels / MN6

01-30-2013, 09:53 AM	#11
Godsplumber Drives: 2012 ZL1,Victory Red Join Date: Jun 2012 Location: Gilbert, Az Posts: 400 View My Garage	There is a fixiit bulletin on this at the dealers, the cap needs replaced. They did mine. __________________ Build thread located at: http://www.camaro5.com/forums/showth...=1#post5732710

01-24-2013, 12:47 AM	#3
2ss-booya Drives: 2015 SS Sedan M6 Join Date: Dec 2009 Location: Dallas, TX Posts: 1,086	They all leak...both SS's I had leaked...its a faulty design. I think theres a thread somewhere around here where a member used a bottle cap ring and fixed the leak? Edit: These links might help http://www.camaro5.com/forums/showth...r+cylinder+fix http://www.camaro5.com/forums/showth...der+cap+recall http://www.camaro5.com/forums/showthread.php?t=175467

01-24-2013, 08:30 PM	#6
2ss-booya Drives: 2015 SS Sedan M6 Join Date: Dec 2009 Location: Dallas, TX Posts: 1,086	As far as I know, even the new GM cap still leaks...Hopefully someone else can chime in and prove me wrong

01-25-2013, 10:45 AM	#7
buffetfn1 Drives: 13 Panther, 12 ZL1, 11 IPC Join Date: Jan 2012 Location: Moncks Corner, SC Posts: 66	The dealer replaced the entire reservoir on mine about 3 months ago. No more issues to date...mine is a 12

01-25-2013, 01:50 PM	#8
RiCorvette Drives: 2017 Corvette Grand Sport 3LT Join Date: Oct 2010 Location: Center of the known Universe Posts: 863	My 2013 leaks - I did the separate Clutch Reservoir and put extra plastic gaskets in the Break Reservoir's cap.

01-30-2013, 10:42 AM	#12
FINALLYSATISFIED Est.1775 Drives: '15 Challenger Hellcat (sold) Join Date: Sep 2009 Location: SoCal Posts: 5,502	Anyone have the bulletin?

01-30-2013, 10:45 AM	#13
RiCorvette Drives: 2017 Corvette Grand Sport 3LT Join Date: Oct 2010 Location: Center of the known Universe Posts: 863	Here's the older version. I'm sure we'd all like to know if it's been updated and revised. TECHNICAL Bulletin No.: 09-05-22-005A Date: March 05, 2010 Subject: Slight Brake Fluid Leak/Weeping Around Master Cylinder Reservoir Cap (Replace Cap) Models: 2010 Chevrolet Camaro Built Prior to VIN Breakpoint A9197567 Supercede: This bulletin is being revised to add a VIN breakpoint. Please discard Corporate Bulletin Number 09-05-22-005 (Section 05 - Brakes). Condition Some customers may comment on noticing that the brake master cylinder reservoir cap has a slight leak or is weeping brake fluid. Cause This condition may be caused by insufficient sealing of the reservoir cap. Correction Replace the master cylinder reservoir cap following the steps below: 1. Remove and discard the original reservoir cap. Note If in question on brake fluid or level, refer to Master Cylinder Reservoir Filling, in SI. 2. Check the brake fluid level. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions. 3. Wipe clean the outside surface of the master cylinder and/or reservoir. 4. Install a new reservoir cap, GM P/N 20819283. Ref: http://www.camaro5.com/forums/showth...35#post6101235 Post # 8

01-30-2013, 12:59 PM	#14
CAM....ZL1 Drives: 2012 ZL1 Join Date: Feb 2012 Location: BENTON, IL. Posts: 1,068 View My Garage	One solution would be. And this what i am gonna do is buy a replacement cap and pull the gasket from one and double the other. I have ordered carbon fiber fluid caps for all fluid resivors and will use the OEM gasket to double the replacement cap gasket which is also OEM.