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Old 04-17-2009, 08:35 AM
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brake line advice please.

Hi guys
i need to know what thread, unc unf etc the brake nipples are on the s10 im building.
the front is all from a 89 blazer and the rear axle is from a 95 s10 pickup.

also i believe the diameter of the lines is different on front and rear.

can anyone shed some light.
cheers

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Old 04-17-2009, 08:51 AM
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GM did some funky things with line sizes and flare nut sizes. My best advice is to call Inline Tube or Precision Tube. They are both companies that sell aftermarket replacement and custom brake line kits. Really nice work. They seem to have all that information stored on their tongue ready to spit out

Most of the GM brake flare nut threads are standard threads; The threads themselves are 3/8"-16 or 5/"16-18 even though they're called a 3/16" flare nut. If you're careful, you can often find a local hydraulics supply that has flare nuts in every imaginable combination of brake line size and thread. Just take a caliper, the master cylinder, and a wheel cylinder with you to make sure you're getting the right thing.

As far as actual line size is concerned, 1/8" is fine. Some say that the rear should be 3/16" to prevent flow restrictions over the long trip to the back. Others say that the front discs require more volume, so the front should be the 3/16". Let the brake components be the answer. Regardless of how big the flare nut is, look at the inverted flare down in side the hole. The diameter of the brake line feeding it must match that flare.
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Old 04-17-2009, 09:48 AM
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cheers curtis, a lot of times you guys use different size stuff than us and i dont always have the option of matching stuff at the parts store.
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Old 04-17-2009, 09:49 AM
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Curtis is correct. While the threads are normal SAE straight threads, they may not be the "standard" flare nut threads normally used on a given diameter hard line. This was done on purpose so that the front and rear lines could not be incorrectly installed on the assembly line.
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Old 04-17-2009, 09:50 AM
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Quote:
Originally Posted by curtis73

As far as actual line size is concerned, 1/8" is fine. Some say that the rear should be 3/16" to prevent flow restrictions over the long trip to the back. Others say that the front discs require more volume, so the front should be the 3/16". Let the brake components be the answer. Regardless of how big the flare nut is, look at the inverted flare down in side the hole. The diameter of the brake line feeding it must match that flare.
I hope you are reffering to the ID of the line when you say 1/8 and 3/16". 3/16" OD tube has approx 1/8" ID, and 1/4" tube has approx 3/16 ID.

Be careful, steel tube is sold and dimensioned by it's OD. If you ask for 1/8" tube you will get something that should not be on a street driven car, and there will be no adapters for it.

Later, mikey
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