Include

[STG]

NCFarmBoy,

My fault for reading exactly what you wrote. I got excited at the prospect of 7,000 lbs. of truck going 70 mph with one bled caliper.

I've seen two cases of trucks with old fluid crash after heating up brakes on a long down grade.

It looks like you did a variation of "gravity bleeding". I prefer using a pressure bleeder, but I'm glad you did all four calipers!

When I changed out the fluid in my truck, I used about 1/2 gallon of fluid. That master cylinder is big and those lines are loooong.

Using Ate Super Blue fluid, it was easy to see when the old fluid was completely pumped out. The discharge goes from dark amber to greenish to blue. Next change, I'll use Ate Typ 200. It's the same as Super Blue except for color - amber. Then, it'll be dirty blue, greenish amber.

Ate Typ 200 / Super Blue is DOT 3/4 and has very high dry/wet boiling points. It has a reputation of being able to hold more moisture than any other fluid and still function. This means it should last about 50% longer than other DOT 3 fluids.

A couple of notes:

1. Do not use racing brake-fluid in your truck. Castrol makes a racing fluid that has a very high dry boiling point that costs $69.00 / liter. "Dry"is the boiling point of fresh brake fluid.

Racing fluid does not deal well with moisture. In other words, it has super high temp performance for a short time. No problem for racers that change fluid every race or track session, but a serious concern for street vehicles.

2. Contrary to urban legend ( and Castrol LMA advertising), a brake fluid with a high wet boiling point (temperature at which it boils with 3% moisture) is not always more resistant to moisture absorption.

An engineer at Continental (Ate) wrote that Ate Type 200 / Super Blue has the highest wet boiling point of any Ate DOT 3 or 4 fluid, even though it absorbs moisture faster than Ate's cheaper DOT fluids. Typ 200 has the highest wet boiling point because it can absorb more moisture while retaining a higher wet boiling point that other fluids.