So, them master cylinders

"SHARPSPEED" (SHARPSPEED) 05/01/2014 at 18:14 • Filed to: None

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Why do these funny looking things need 2 cylinders again?

crowmolly > SHARPSPEED 05/01/2014 at 18:16

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You serious?

Dingers Ghost, Champion Jockey > SHARPSPEED 05/01/2014 at 18:16

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For the split brakes. That way, if something goes wrong, you will still have at least 2 wheels with brakes. Say if lines blow in the rear, you'll still have front brakes and vise versa.

Nick, Drives a Cobalt LT > Dingers Ghost, Champion Jockey 05/01/2014 at 18:18

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Left front to right rear

Right front to left rear.

Not a split on front to rear.

That is what I learned anyway.

The Real Dacia Sandero > SHARPSPEED 05/01/2014 at 18:18

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One for the front, and one for the rear. The front and rear need separate pressures to maintain an ideal brake balance.

Also, if a line ever goes, you'll still have brakes on the other axle.

SHARPSPEED > crowmolly 05/01/2014 at 18:21

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Lighten up, bud. I'm trying to learn.

lone_liberal > SHARPSPEED 05/01/2014 at 18:21

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In case one circuit fails you still have brakes. Older cars only had one.

SHARPSPEED > Dingers Ghost, Champion Jockey 05/01/2014 at 18:22

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Thank you!

crowmolly > SHARPSPEED 05/01/2014 at 18:26

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Sorry, did not mean to be insulting, I honestly wasn't sure if you were serious or not. Dinger's nailed it.

If you want more information on how braking systems work, the people at StopTech have put together a bunch of technical white papers that go into great detail:

http://www.stoptech.com/technical-supp…

Not exactly light reading but good stuff. The "warped disc myth" is a personal favorite. It's written by Carroll Smith of GT40/Cobra fame.

Dingers Ghost, Champion Jockey > Nick, Drives a Cobalt LT 05/01/2014 at 18:31

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That would make more sense than a bias to either front or rear. Opposite corners would make it more driveable

doodon2whls > Dingers Ghost, Champion Jockey 05/01/2014 at 18:32

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Actually, modern-day 4-channel ABS sensed/actuated brake systems brakes are plumbed to fail diagonally since there are four individual lines coming from the EHCU. The EHCU takes the two lines from the MC and biases and splits the fluid to LF/RR and RF/LR circuits. In the 'olden days' with three channel brakes (rear was a single line from the MC to a 'tee' in on the axle), the brakes would fail front or rear. Although, even some older cars had a fancy brake proportioning valve that could handle diagonally split brakes, but again, you need '4-channel' brakes.

Dingers Ghost, Champion Jockey > doodon2whls 05/01/2014 at 18:34

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So I was close, just a little bit behind in time. I probably thought of the three channel system because that's more of what I've dealt with.

doodon2whls > Dingers Ghost, Champion Jockey 05/01/2014 at 18:40

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Oops, just saw 404's post... Apologies.

Dingers Ghost, Champion Jockey > doodon2whls 05/01/2014 at 18:41

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Oh no problem!

SHARPSPEED > crowmolly 05/01/2014 at 18:50

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There needs to be a "Automotive Fundamentals for dummies" book or something. I'm sure I'm not the only fool around here asking what must seem like a stupid question for many others.