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Old 07-29-2012, 11:52 AM   #4
jeffcoslacker
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Re: lumina split brake system question

It's known as split diagonal, common on FWD cars. Works as McLin described.

Since front/rear bias on FWD cars is close to 90/10, you'd have almost no brakes at all if you lost the front in a front/rear split system. The split diagonal assures you'll always have one front and one rear available, which gives you sufficient stopping power in a loss of one side of the system...but whenever you experience a sudden catastrophic loss of fluid pressure you're gonna lose the pedal and be without brakes, regardless of the design.

The only way I could think of to prevent this would be the use of hydraulic "fuses" that close and isolate the leaking part of the system when too much fluid tries to move through too quickly without pressure...that's how aircraft systems work now...but you aren't gonna see the car companies put this kind of fail safe in...not for what they'd consider to be out of warranty fatigue/corrosion related failure, something that's really not their responsibility.

They don't claim or expect these cars to last long enough to rot out the brake lines...
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