 
Main Menu
|
|
Nevada Classics
|
|
Advertise at CC
|
| S |
M |
T |
W |
T |
F |
S |
| |
1 |
2 |
3 |
4 |
5 |
6 |
| 7 |
8 |
9 |
10 |
11 |
12 |
13 |
| 14 |
15 |
16 |
17 |
18 |
19 |
20 |
| 21 |
22 |
23 |
24 |
25 |
26 |
27 |
| 28 |
29 |
30 |
|
|
|
|
|
|
CC Advertisers
|
|
 3Likes
-
2
Post By spdbrake
-
1
Post By patrickt
04-14-2017, 09:03 AM
|
 |
CC Member
|
|
|
Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
|
|
Not Ranked
Master Cylinder Leaking
I seem to have a very slight leak on one master cylinder. Not leaking from any fitting, but "weeping"? I checked the fittings and they're not wet, but the MC develops a drip on the bottom every 4 or so days?
|
04-14-2017, 10:30 AM
|
 |
CC Member
|
|
|
Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,473
|
|
Not Ranked
Bill,
Is it possible that there might be a small crack in the MC?
__________________
Last edited by 1795; 04-14-2017 at 12:08 PM..
|
04-14-2017, 10:50 AM
|
|
CC Member
|
|
|
Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
|
|
Not Ranked
I've looked with a light and can't see anything. Frustrating
|
04-14-2017, 01:29 PM
|
 |
CC Member
|
|
|
Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,439
|
|
Not Ranked
How many miles? What kind of MC, aluminum? Is the rod from the brake pedal into the MC well aligned with the centerline of the MC?
__________________
Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
|
04-14-2017, 02:59 PM
|
|
CC Member
|
|
|
Join Date: Dec 2015
Posts: 1,442
|
|
Not Ranked
After cleaning the area with Alcohol and let air dry a few min, spray the area with an Aerosol Powder Antiperspirant. It will leave a white residue that small leaks will wick into and show the leak path.
Last edited by spdbrake; 04-14-2017 at 05:35 PM..
|
04-14-2017, 03:35 PM
|
|
CC Member
|
|
|
Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
|
|
Not Ranked
Quote:
Originally Posted by Tommy
How many miles? What kind of MC, aluminum? Is the rod from the brake pedal into the MC well aligned with the centerline of the MC?
|
Brand new. Zero miles. Leaking from the front tip. Aluminum MC |
04-14-2017, 04:13 PM
|
 |
CC Member
|
|
|
Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,483
|
|
Not Ranked
One of my ERA master cylinders leaked right off the bat. It was a scuffed up bore when I opened it up. Apparently if the stroke of the rod is not well aligned with the piston bore it doesn't take long for it to damage the bore.
|
04-14-2017, 05:09 PM
|
|
CC Member
|
|
|
Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
|
|
Not Ranked
Did some more investigation on my master cylinder leak. It's porosity. I don't want to remove the pedals, floor, brake lines, and bottom panel to R&R the bad unit. Any suggestions?
|
04-15-2017, 06:01 AM
|
 |
CC Member
|
|
|
Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
|
|
Not Ranked
I wondered about porosity...but not with aluminum, my prior experience was with a cast iron master cylinder.
How about some sort of high-build primer, followed by a few coats of paint? If you can use a two-part epoxy primer/paint combo it will "cure" from the catalytic reaction and should hold up against the brake fluid, which might soften and disolve a regular paint.
Maybe a few heavy coats of powder coating?
Tough issue, Bill. I ended up replacing mine in the end...but, it needed to be replaced anyway to get better braking. You may find it easier to work on off the car...this has been a tough build!
Cheers!
Dugly 
__________________
YD,E./PNB
No names were changed to protect the innocent! 
|
04-15-2017, 06:10 AM
|
|
Half-Ass Member
|
|
|
Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
|
|
Not Ranked
Quote:
Originally Posted by Bill D
Did some more investigation on my master cylinder leak. It's porosity. I don't want to remove the pedals, floor, brake lines, and bottom panel to R&R the bad unit. Any suggestions?
|
Bill, I know of only one easily applied "goo" type product that works on brake fluid. I wrote about it here: Brake Fluid Resistant Sealant for Girling Reservoirs |
04-15-2017, 07:26 AM
|
|
CC Member
|
|
|
Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
|
|
Not Ranked
Thanks Patrick
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -7. The time now is 03:47 AM.
Links monetized by VigLink
|
Linear Mode
