2003 GMC Safari Brakes

2003 GMC Safari Brakes

Postby MarquezErnest [OP] » May 15th 2020, 12:28am

Good evening everyone,
Almost a week ago, I had a leak on the rear brake line near the gas tank. Replaced it, bled the lines numerous times till all the air was out of the lines. On three different occasions while driving at low speeds or starting to drive I would have no breaks. Peddle to the floor. No loss of brake fluid, no leaks under the van. Everything looks good. I shut the van off, open the reservoir to check fluid and all good.Today drove about two hours, parked and went shopping. When I came out and stated the van, no brakes. White smoke started to come from under the front passenger tire. Pouring rain out, got out to look and the steel line from the distribution box broke off at where it connects to the rubber line going to the caliber. The steel line was shooting out steam. I put a rag over it and it burnt the rag. I do not have a lot of money to replace every thing that pertains to the brake system on the the van. All the calibers are new, lines do not leak. Well, know the front passenger one dose. If anyone has had this problem please help me. I am stumped. Also my family and Ithank you in advance. Be safe
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Re: 2003 GMC Safari Brakes

Postby 97cargocrawler » May 15th 2020, 2:05am

My lord. That don't look good. :shock: I would sort of expect to see clean fluid in the reservoir since you just bled everything.
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Re: 2003 GMC Safari Brakes

Postby plymouthcranbrook » May 15th 2020, 4:45am

I have never heard of anything like that happening. Boiling brake fluid? i have seen water in contaminated fluid boil after heavy usage but after sitting for 2 hours... Never. and water turning to steam does cause the pedal to fail but not cold. WOW
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Re: 2003 GMC Safari Brakes

Postby TBLBill » May 15th 2020, 2:29pm

The brake fluid could have been hot enough to burn the rag if you had just driven the van. Especially if there was some moisture in there, it could boil. Brake fluid can reach several hundred degrees when in use. I would replace the line and hose that leaked, clean all the dirt out of the reservoir, fill it, bleed the master cylinder, and bleed the rest of the brakes until you get clear fluid from all bleed screws. I've replaced the same hose on my van for leaking there, it seems pretty common that it rusts.
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Re: 2003 GMC Safari Brakes

Postby AstroWill » May 15th 2020, 6:39pm

Damn, that system is going to need more than just that one hose, look at the steel line in that last picture. Looks like it needs a really good cleaning/flush, some new lines, fresh fluid and a proper bleed.

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Re: 2003 GMC Safari Brakes

Postby MarquezErnest [OP] » May 16th 2020, 12:25am

Thank ALL OF YOU ,
Just a follow up. The van sat all night in my drive way in the rain. At 4pm today started to take off the calibor and all of a sudden the line started shooting out white smoke again see video. did not start the van. Disconnected the pos batt cable very fast. At that point it stated to stop smoking. Fliud was newly added while bleeding the first time it know looks burnt. Sorry site bloked my video.
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Re: 2003 GMC Safari Brakes

Postby Leeann_93 » May 16th 2020, 1:39am

Holy crap.


It looks to me like you need to replace the entire brake system. The lines in the pics look AWFUL.

Pressure causes heat, and a LOT of it, and water will boil out of brake fluid pretty quickly, that's one reason to flush the system every year or two.

Replace the lines, replace the hoses. Bleed all 4 corners until clear fluid comes out. If you don't have access to a Tech 2, SnapOn or other pro scanner to perform the ABS bleed, take it somewhere. After the ABS bleed is performed, then bleed each corner again. The ABS bleed will get the air out of the ABS pump, but it puts it out into the lines.
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Re: 2003 GMC Safari Brakes

Postby MarquezErnest [OP] » May 16th 2020, 5:30pm

Thank you Leeann, I am going to start that long and lonely journey today. I have a new caliber and going to purchase new tubing today to install all new lines thru-out. Contaced a few repair shops near me and no one has ever seen or heard of this happening before nor could they explain it. Very worried this is our family van three small kids and wife.What about the power booster pump ,Master cylinder and I"ve heard of a proportioner ?
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Re: 2003 GMC Safari Brakes

Postby Leeann_93 » May 16th 2020, 5:40pm

You'd have to test, but it looks like the booster is working. Master cylinder certainly needs a thorough cleaning and then bench-bleeding. Lines go from the master cylinder to the proportioning valve, then to the ABS pump and then to the wheels. The proportioning valve probably needs to be flushed, but they generally don't fail.
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Re: 2003 GMC Safari Brakes

Postby augidog » May 16th 2020, 5:48pm

MarquezErnest wrote:Thank ALL OF YOU ,
Just a follow up. The van sat all night in my drive way in the rain. At 4pm today started to take off the calibor and all of a sudden the line started shooting out white smoke again see video. did not start the van. Disconnected the pos batt cable very fast. At that point it stated to stop smoking. Fliud was newly added while bleeding the first time it know looks burnt. Sorry site bloked my video.
you got that with a cold vehicle? It slowed when you unhooked the battery? I've never seen anything like that, so I'm only poking in the dark, but I'd be looking for a wire rubbed raw and making contact with a steel line. It doesn't make sense though that a grounded wire wouldn't blow a fuse, do you have any unfused auxiliaries coming off the battery?
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Re: 2003 GMC Safari Brakes

Postby AstroWill » May 16th 2020, 6:34pm

I would totally be interested in seeing that video.
MarquezErnest wrote:Sorry site bloked my video.

The best way is to upload it to youtube and then copy the video code and put it between the youtube tags.
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augidog wrote:I've never seen anything like that, so I'm only poking in the dark, but I'd be looking for a wire rubbed raw and making contact with a steel line. It doesn't make sense though that a grounded wire wouldn't blow a fuse, do you have any unfused auxiliaries coming off the battery?

The only thing I can think of is the large battery cable that runs to the starter would make sense for something like that.

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Re: 2003 GMC Safari Brakes

Postby gavio » May 16th 2020, 6:38pm

you got that with a cold vehicle? It slowed when you unhooked the battery? I've never seen anything like that, so I'm only poking in the dark, but I'd be looking for a wire rubbed raw and making contact with a steel line. It doesn't make sense though that a grounded wire wouldn't blow a fuse, do you have any unfused auxiliaries coming off the battery?


That's what comes to my mind, too..... It doesn't exactly seem logical, and I don't know nuthin' but the fact that it stops with battery disconnect seems worth following....
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Re: 2003 GMC Safari Brakes

Postby Sailing_Faith » May 16th 2020, 7:37pm

I really don’t know.... maybe you need an exorcist?

How on earth would anything get hot enough to blow smoke after sitting all night?
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Re: 2003 GMC Safari Brakes

Postby petema » May 16th 2020, 8:45pm

Wrong brake fluid added? Check container.
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