Brake help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1BadSS · 10-31-2006, 07:11 PM

Was looking over my 69 getting it road worthy, found the rear pot in the master cylinder to be bone dry. What i'm wondering is, if the rear pot is for the front or rear brakes? The front pot is filled to the top and the front has been converted to disc brakes.

Anyone have an idea? What's the first thing to leak on these trucks on the drum setups? The wheel cylinders or are the lines prone to leaking?

Wondering because I want to make a trip saturday to chevy duty to get the parts I need.

**Green Machine** · 10-31-2006, 07:15 PM

Rear pot is for the rear brakes. If there are no big leaks from the lines, suspect the wheel cylinders, Also your master cylinder could be leaking out the back, down the firewall, is paint missing there? or into the brake booster if it has one.

1BadSS · 10-31-2006, 07:31 PM

Quote:

Originally Posted by Green Machine

Rear pot is for the rear brakes. If there are no big leaks from the lines, suspect the wheel cylinders, Also your master cylinder could be leaking out the back, down the firewall, is paint missing there? or into the brake booster if it has one.

I'll have to go and look for those things. Thats what i'm looking for, basic idea's of things that I need to look for.

Thanks!

1BadSS · 10-31-2006, 09:33 PM

Quote:

Originally Posted by Green Machine

Rear pot is for the rear brakes. If there are no big leaks from the lines, suspect the wheel cylinders, Also your master cylinder could be leaking out the back, down the firewall, is paint missing there? or into the brake booster if it has one.

There is a fairly good sized rust spot on my firewall to the left of the mc if you're looking directly at it. Think it's my master cyl?

st1x10 · 10-31-2006, 09:37 PM

Put some brake fluid in it and find the leak.

1BadSS · 10-31-2006, 09:40 PM

Quote:

Originally Posted by st1x10

Put some brake fluid in it and find the leak.

Kinda difficult, the truck is a half hour away.

Trying to get a basic diagnosis here.

Gordo · 10-31-2006, 10:38 PM

If your looking for a quick check st1x10 has it right, if you have a major leak. If your looking to make it ROAD WORTHY and safe, a basic diagnosis is to inspect and evaluate the system from one end to the other and that would be to jack up all four corners and pull all four wheels and drums off (where applicable) and inspect everything from the pedal to all four corners. You could have a rotted steel brake line or a split brake hose which would show up right away or you could have a leaky rear wheel cylinder(s) or master cylinder and that may take weeks/months for the pot to dry up.

10-31-2006, 07:11 PM	#1
1BadSS NOT REALLY BANNED! Join Date: Jul 2004 Location: Shawnee, KS Posts: 1,072	Brake help! Was looking over my 69 getting it road worthy, found the rear pot in the master cylinder to be bone dry. What i'm wondering is, if the rear pot is for the front or rear brakes? The front pot is filled to the top and the front has been converted to disc brakes. Anyone have an idea? What's the first thing to leak on these trucks on the drum setups? The wheel cylinders or are the lines prone to leaking? Wondering because I want to make a trip saturday to chevy duty to get the parts I need. __________________ 1987 Mustang Coupe - 2.7 Stroker, 78mm turbo, Stainless header, 3" Exh, FMIC, 160lb/hr Injectors, MS3, twin walbro 255's, 34psi. Eating V8's daily. 04 Pontiac GTO 04 Ford Mustang GT 68 C20 LWB stripper truck 73 K5 Cheyenne 76 C20 Sierra Crew SRW 88 K20 Suburban I'm not hammering on metal just to hammer, i'm creating a piece of art.

10-31-2006, 07:15 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Brake help! Rear pot is for the rear brakes. If there are no big leaks from the lines, suspect the wheel cylinders, Also your master cylinder could be leaking out the back, down the firewall, is paint missing there? or into the brake booster if it has one. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

10-31-2006, 09:37 PM	#5
st1x10 Registered User Join Date: Feb 2006 Location: Oklahoma City Posts: 588	Re: Brake help! Put some brake fluid in it and find the leak. __________________ 1970 Chevy C10 "Under Construction" 2002 Chevy S10 V6

10-31-2006, 10:38 PM	#7
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Re: Brake help! If your looking for a quick check st1x10 has it right, if you have a major leak. If your looking to make it ROAD WORTHY and safe, a basic diagnosis is to inspect and evaluate the system from one end to the other and that would be to jack up all four corners and pull all four wheels and drums off (where applicable) and inspect everything from the pedal to all four corners. You could have a rotted steel brake line or a split brake hose which would show up right away or you could have a leaky rear wheel cylinder(s) or master cylinder and that may take weeks/months for the pot to dry up. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

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