Question about 1999 Chevrolet Silverado 1500

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2 issues...Brake tube rusted and random cylinder misfire


Thanks for this site!

I need to know a few things about replacing brake lines on my 99 ECSB 4x4 Silverado 4.8 150k miles. I am losing brake fluid and have basically no pressure on the brake pedal. The brake lines are very rusted and pitted. I am presuming they need to be replaced and I'd like to try it myself. I've done other maintenance on the truck (shocks, rusted panel replacement), so I feel confident that with the right info I can get it done.

This truck spent it's first 5 years in the rust belt.

1. What is the OEM diameter of the tubing? I plan to use plain steel, not stainless.
2. Once I get the tube bent, would it hurt anything to paint them with rust bullet?
3. So I know what flaring tool to get, what kind of flares are on the ends of the tube?

My sencond problem is this: Whenever it rains, I drive my truck and get bad misfires. Could the fuel lines be rusted along with the brake lines and water leaking into the fuel system? The problem goes away after a little driving/hear acceleration and then comes back if the truck is restarted.

thanks again!


Posted by on

  • smile4_97 Jan 13, 2009

    Thanks. I have a scanner and it gives me random cylinder misfire code P0300. When the truck dries out or is off for some time, the code goes away by itself. I thought I had an exposed ground (attached to the fiewall) that was shorting, but I covered that and the issue still came back. It's frustrating but the truck does still run OK otherwise. I'll try the MAF. If this were the case does that mean water is getting past the air filter somehow? I have a K&N, but it was problematic before I installed that.



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1. What is the OEM diameter of the tubing? I plan to use plain steel, not stainless. If they use salt on the roads stainless is better, TUBING IS 3/16"
2. Once I get the tube bent, would it hurt anything to paint them with rust bullet? No for mild steel, stainless won't rust though, no paint req'ed
3. So I know what flaring tool to get, what kind of flares are on the ends of the tube? U will need a tool that does double flares, around $60 US, if u have ever used a double flare tool read the instructions carefully.
As far as OD of line, take the old to the parts store and match it, but I think it is 3/16"

The engine issue, best u have a trouble code test run and go from there, any Kragen or Autozone will do it for free, if nothing shows clean the inside of the MAF sensor with CRC brand MAF cleaner, water could not get in the line because there is over 40 pounds of pressure, u would see allot of gas on the ground under the truck.


Posted on Jan 13, 2009

  • yadayada
    yadayada Jan 13, 2009

    K&N filters sometimes cause a MAF issue because the oil or the tiny fibers of the filter get on the MAF sensor heated element and confiuse the signal, this is a very good place to start.


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