master cylinder leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71chevylongbed · 01-17-2004, 10:28 PM

my master cylinder is leaking at the back. can i wait a couple months to replace it or do i need to fix it now?

cdowns · 01-17-2004, 10:32 PM

driving a truck with faulty brakes is a dangerous affair they won't get better only worse and could fail completely at any time REMEMBER THAT WHEN YOU SEE A SCHOOL BUS

Tx Firefighter · 01-17-2004, 10:54 PM

One at the parts store will cost less than 20 bucks. Don't be cheap and risk killing somebody's family with bad brakes.

lukecp · 01-17-2004, 11:01 PM

Buy a new master cylinder.

$20 or less as stated above, and only takes 30 minutes to install.
You don't want to drive anywhere with bad brakes.

BTW, don't forget to bench bleed the MC. It should have instructions with it.

s95930 · 01-17-2004, 11:03 PM

Fix It!

Jeff M. · 01-17-2004, 11:07 PM

Spend a few more $$ and get a new, not a rebuilt. I had 2 rebuilt ones on my truck....lasted a few years. The new one is still going strong after 5+ years.

Jace's68 · 01-17-2004, 11:41 PM

Better fix it now.

**old Rusty C10** · 01-17-2004, 11:56 PM

ya know this kind of reminds me of that joke thread where the guy had no electricity and called the computer company to find out why his computer wasnt working...... if you really have to ask if you need to fix faulty breaks........

Longhorn Man · 01-18-2004, 02:00 AM

While it is true that it needs to be replaced, and if you have 20 bucks, I say do it now....but I will go out on a limb and say I have driven a number of vehicles (including my 69 GMC) with the master leaking out the back for up to a year with absolutly no problems at all.
leagal disclaimer...I am in no way shape or form recomending you do this though...but in a pinch....

Rooster's 67 · 01-18-2004, 02:24 AM

If the truck in question is a power brake truck, avoid driving it any longer than needed. If by chance the rear seal is dumping fluid into the booster it will weaken and possibly cause the diaphram in the booster to start leaking, causing lessened assist given by the booster.

and as I tell my customer's, "it's a b!tch when they don't go,,,,,,But it's a mother when they won't stop!" ........................."but it's your children, your life, and your decision"

Blue Beard · 01-18-2004, 03:25 PM

You can do it all in a day..............better not delay........

71chevylongbed · 01-18-2004, 08:20 PM

where can i buy a good new master cylinder for $20? will a stock one work alright when i add rear disc brakes?

*rage'nrat638* · 01-18-2004, 08:35 PM

auto zone...
http://www1.autozone.com/servlet/UiB...n=viewHomePage

you will need a ajustable pro-valve...
just a thought...thats what i had to do to my 85 with wilwood rear disc...

dinnut · 01-18-2004, 08:44 PM

mine cost 17 bucks at autozone. i say that you should replace while they still work!

71chevylongbed · 01-18-2004, 08:53 PM

i'll replace it as soon as i can

01-17-2004, 10:28 PM	#1
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	master cylinder leak my master cylinder is leaking at the back. can i wait a couple months to replace it or do i need to fix it now? __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

01-17-2004, 10:32 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	driving a truck with faulty brakes is a dangerous affair they won't get better only worse and could fail completely at any time REMEMBER THAT WHEN YOU SEE A SCHOOL BUS __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-17-2004, 10:54 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	One at the parts store will cost less than 20 bucks. Don't be cheap and risk killing somebody's family with bad brakes. __________________ I'm on the Instagram- @Gearhead_Kevin

01-17-2004, 11:01 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Buy a new master cylinder. $20 or less as stated above, and only takes 30 minutes to install. You don't want to drive anywhere with bad brakes. BTW, don't forget to bench bleed the MC. It should have instructions with it. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

01-17-2004, 11:03 PM	#5
s95930 A-Adam A-Adam Join Date: Apr 2003 Location: Sarpy Co. Ne. South of Omaha Posts: 263	Fix It! __________________ 70 3/4 ton GMC Camper Special

01-17-2004, 11:07 PM	#6
Jeff M. Registered User Join Date: Feb 2000 Location: Pixley, Ca. Posts: 486	Spend a few more $$ and get a new, not a rebuilt. I had 2 rebuilt ones on my truck....lasted a few years. The new one is still going strong after 5+ years. __________________ 69 C-10 CST Short Fleet, Factory Air, BB427-400 Auto-2400 stall-tilt-cruise-Tach & Vac Gagues, 4/6 drop, power one piece side windows, Eaton posi.

01-17-2004, 11:41 PM	#7
Jace's68 Registered User Join Date: Sep 2002 Location: Kentucky Posts: 107	Better fix it now.

01-17-2004, 11:56 PM	#8
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,326	ya know this kind of reminds me of that joke thread where the guy had no electricity and called the computer company to find out why his computer wasnt working...... if you really have to ask if you need to fix faulty breaks........ __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

01-18-2004, 02:00 AM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	While it is true that it needs to be replaced, and if you have 20 bucks, I say do it now....but I will go out on a limb and say I have driven a number of vehicles (including my 69 GMC) with the master leaking out the back for up to a year with absolutly no problems at all. leagal disclaimer...I am in no way shape or form recomending you do this though...but in a pinch....

01-18-2004, 02:24 AM	#10
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	If the truck in question is a power brake truck, avoid driving it any longer than needed. If by chance the rear seal is dumping fluid into the booster it will weaken and possibly cause the diaphram in the booster to start leaking, causing lessened assist given by the booster. and as I tell my customer's, "it's a b!tch when they don't go,,,,,,But it's a mother when they won't stop!" ........................."but it's your children, your life, and your decision" __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

01-18-2004, 03:25 PM	#11
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	You can do it all in a day..............better not delay........ __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

01-18-2004, 08:20 PM	#12
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	where can i buy a good new master cylinder for $20? will a stock one work alright when i add rear disc brakes? __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

01-18-2004, 08:35 PM	#13
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	auto zone... http://www1.autozone.com/servlet/UiB...n=viewHomePage you will need a ajustable pro-valve... just a thought...thats what i had to do to my 85 with wilwood rear disc...

01-18-2004, 08:44 PM	#14
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	mine cost 17 bucks at autozone. i say that you should replace while they still work! __________________ 70 longbed 496/th400/Ford 9"

01-18-2004, 08:53 PM	#15
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	i'll replace it as soon as i can __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers



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