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Rear brake line on my 2007 Chevy rusted into where it goes through frame. Thankfully I was in parking lot when it happened, and not on highway. What is up with this brake system? Spring a leak in rear line, and have no brake pedal. I remember they used to have a 2 reservoir master cylinder. I've read these year models are bad for lines rusting. Anyone have any experience with this?


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ya we have owned 3 silverados from 2003-2006. all needed brakelines. go the extra money and put stainless.


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I was thinking about replacing all of them with stainless. I don't really want a 6,000 lb rocket with no way to stop.


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Can't speak for E.Tn. But in the Lex. Ky. area it's rampant in all brands & models over a certain age due to the liquid ice melt they spray on the highways.

Hell, Toyota replaced a boatload of frames under Tacomas & bought back others.

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It’s definitely a thing. I own more than a few 2004-2019 GM Silverado’s and express vans, 1500,2500,3500,4500 & 6500. Replaced all the rotted brake lines on close half of them. I was sitting on the exit scales at the quarry in my 6500 and the pedal went to the floor. Lucky as fugg. If it had blown a minute later I’d have been heading downhill toward a stop sign at a busy interection.

Mechanic told me it’s a given.



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Originally Posted by Jiveturkey
I was thinking about replacing all of them with stainless. I don't really want a 6,000 lb rocket with no way to stop.

Try a 12,800lb rocket with another 13,000 lbs of #57’s loaded on it.



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I've heard that spray is fairly bad stuff. They call it brine around here, but not sure what all is in it.


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The rear brake line rusted through on my 2005 gmc with only 50k miles on the truck. I was pulling up to the drive thru window at McDonald’s when the pedal went to the floor.

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I have replaced all of the brake lines on my 99 Silverado over the last two years, The long line from the drivers side rear going to the front is a real pain in azz to replace, it goes over the top of the fuel tank before it goes under the cab. We had to unbolt and tip the bed up to get the pre-bent line through a spot the size of a quarter.


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Originally Posted by jackmountain
It’s definitely a thing. I own more than a few 2004-2019 GM Silverado’s and express vans, 1500,2500,3500,4500 & 6500. Replaced all the rotted brake lines on close half of them. I was sitting on the exit scales at the quarry in my 6500 and the pedal went to the floor. Lucky as fugg. If it had blown a minute later I’d have been heading downhill toward a stop sign at a busy interection.

Mechanic told me it’s a given.

I'll replace these, and should be good. I'll probably wince from now on when I pass another one.


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Jeepers - need go go out and look under the 2003.


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The pre-70's cars had a single piston, single reservoir system.
Anything fails, you have nothing.


Then they went to a dual chamber, dual reservoir system.
Front and rear circuits, you only lost brakes on one end with a single failure.


Sometime around 1990, they started using a single reservoir to feed
the dual piston. Dumbest fudging thing I ever saw.

You have two seperate systems, but the are supplied
from a single place.

If you are driving when it pops a leak, you get maybe two brake
pumps, then...No brakes!

If the leak comes when it's sitting, or if you cause a leak by pressing the
pedal, but don't notice, it will siphon out. No brakes, no warning light!


This was done (I think) to save weight, and money by using that cheap
ass plastic tank.



This isn't GM specific either.
The whole thing I wrote applies across the industry as far as I know.
Not sure about German cars.

Last edited by Dillonbuck; 01/03/21.

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Your emergency/parking brakes will still work if a line pops, I've had to limp home that way.


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I am sure the liquid de icing agent ingredients vary around the country but for awhile they were using quite a bit of magnesium chloride. Very corrosive , kills quite a bit of vegetation, highly soluble as it enters the water table. The amount of damage to vehicles alone is huge, but I questioned some engineers many years ago who worked for the state of CO and said the lives that are saved on the highways outweigh the damage to the environment and the vehicles. Extremely detrimental to concrete as well.

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Originally Posted by troublesome82
I am sure the liquid de icing agent ingredients vary around the country but for awhile they were using quite a bit of magnesium chloride. Very corrosive , kills quite a bit of vegetation, highly soluble as it enters the water table. The amount of damage to vehicles alone is huge, but I questioned some engineers many years ago who worked for the state of CO and said the lives that are saved on the highways outweigh the damage to the environment and the vehicles. Extremely detrimental to concrete as well.


This.

Not to mention the rerod in the concrete.

Had a guy bitch about this to me one time. Parts are junk nowadays.

Told him to take a 1965 whatever make and model for one winter in it will be fugged in short order and faster than this "new junk".

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They used calcium chloride here for awhile, according to my
DOT employed BIL.
Now it's a salt brine.


Funny thing, sort of.

With the required DEF and exhaust system needing t o be right behind the
cab on the new trucks the state buys, they can change the
exhaust or mount the beds up against the cab. Wing plows might play a role also.
So, they stuck the brine tanks between the cab and bed.

Spilled brine runs off the tank and down to various mounts and over the
doubled frame.

Yep, saltwater brine running between the double frame is about what you would expect.
He says he is just waiting to see a number of these trucks folded in half.
Probably in summer when they are driving with the beds up,
dumping in a paver.


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It pays to go through a car wash with a good undercarriage sprayer fairly regularly in the winter if you live where they salt the roads. Buys some time. Having said that I replaced all the lines in my 04 Sierra when I had it, they rotted right out I did them before they leaked though.

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Its a GM thing. Just ask any guy looking for a Duramax from 2000-2010. First thing to check when you look at one on a lot or a private seller is the brake lines, rocker panels, fenderwells,frame. Northern born trucks are worse but I've seen them just as bad on southern trucks that seldom see road melt agents. I know of 3 replaced in the last year. Go stainless and never look back.

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Originally Posted by Dillonbuck
The pre-70's cars had a single piston, single reservoir system.
Anything fails, you have nothing.


Then they went to a dual chamber, dual reservoir system.
Front and rear circuits, you only lost brakes on one end with a single failure.



The dual reservoir master cylinder was federally required on all 1967 model year and newer vehicles.

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Thanks, I didn't know exactly when, but knew it was so by 1970.


Dad had a brake leak with a 90's Cadillac, was telling me he lost
all brakes. He didn't understand why the did away with the dual system.
He's not good at explaining, so (in my 40's)
"Dads wrong about that, no way they would do that?"

Fast forward a couple years and my wife's Caravan blew a line.
"Hmmm, this must be what Dad meant."


A few years later my Junker Subaru popped one.
Got it home, filled the reservior and waited for my wife to follow me to
the guy who was going to fix it. And for there to be less traffic, because I knew
I only had about 3 brake attempts and 8 miles and 2 stop lights.

Started out the driveway and found out about the siphon thing.
Lucky I was able to get back into the bottom of the yard and go uphill.
Refilled and bled, we pulled it off.
It was an auto. I hate driving with no brakes in an automatic!

Someone posted about E-brakes.
Who has an older vehicle with a working E-brake?
Inspection stations don't even check them.
If you do get them pulled on, they stick. One reason many cars wear out the front pads.
That's another thread.


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