dual master cylinder

[tubman]

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I can verify that a dual system should be well engineered and ideally, each circuit should be tested independently. I say this because of my experiences with a factory system. I have a "beater" '99 Ford F150 that I purchased new. Being in the Twin Cities area in the beginning of its life, it has encountered the usual rust problems, including brake lines. The first to go was one of the rear lines. While it was apparent that there was a problem, the truck was drivable and I was able to get to my shop with no problem and replace the rear lines. A quick bleed, and I was back on the road again.

A few years later, a front line rusted through and it was a completely different story. The brake system was so compromised that there was very minimum stopping power. Luckily, I was less than a couple of miles from my shop (which is on a county road out in the country) and was able to creep back to it. I replaced the front lines, and after a bleed, the brakes were back to normal. I was surprised by this because I did not expect the almost total failure unless something else went wrong.

Maybe it was a design problem on this particular model of truck, but ever since, I have lost the confidence I once had in dual systems.