Slave Cyl vs Master Cyl - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 6 Old 09-21-2013, 04:54 AM Thread Starter
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Slave Cyl vs Master Cyl

Hi,

The terms "master cylinder" and "slave cylinder" often come up when discussing hydraulics. I thought I had figured out the meaning of the terms but now I'm not so sure...

On our bikes, isn't the slave cylinder down by the brake disc (i.e. it pushes the brake pads) and the master cylinder would be the one driven by the brake lever?

The reason I ask is that I have seen banjo bleeders for sale that are described as "replacing the banjo bolt at the master cylinder."

What is it that I am not getting here ? Have I got it all back to front?

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post #2 of 6 Old 09-21-2013, 05:27 AM
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Yes your correct

Bubbles rise in a fluid, air trapped in the brake system will want to rise to the highest point. In a motorcycle this is the master cylinder. Additionally the fluid path in a banjo system is very convoluted allowing many small areas for bubbles to get stuck.

I learned long ago to bleed at the banjo bolts as well as the calipers for the hardest lever. If your by yourself figure out how to press the lever, belly rubber band, friend etc, wrench and a rag under the banjo squeeze and then crack the banjo and watch the fluid and little bubbles come out.

Brake fluid will hurt paint and plastic and I recommend a hose down after spraying brake fluid, its water soluble.
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post #3 of 6 Old 09-21-2013, 06:01 AM
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Slave cylinder is at the receiving end of the fluid push- hence "slave".

Master cylinder is at the pushing end of the equation- hence it is the "master".

So you are correct in your understanding of it all.

The seller of said parts has it backwards.

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post #4 of 6 Old 09-21-2013, 06:12 AM
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Some people install bleeder banjos at the master cylinder so they can get out any bubbles that might be trapped in the head of a regular banjo bolt. It's not a mistake ... not necessarily anyway.

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post #5 of 6 Old 09-21-2013, 06:37 AM
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Quote:
Originally Posted by Dark Angel View Post
Some people install bleeder banjos at the master cylinder so they can get out any bubbles that might be trapped in the head of a regular banjo bolt. It's not a mistake ... not necessarily anyway.
Good point DA, I never thought they might be doing that as I've never had to bleed anything that way.

Well except for my Series 2 and 2A Landrovers that had to be stood on their bloody heads to get air out of the brake system... maybe bleeder banjos at the master cylinder would have made it easier.

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post #6 of 6 Old 09-21-2013, 06:50 AM
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I believe SV racing sells these things for both master and slave cylinders, though they're usually used in the brakes rather than the clutch system as far as I know.
I'm still not 100% happy with the feel of my brakes after installing stainless lines, though they're still better than the stock rubber ones, so I think the banjo bleeding thing might be my next step.

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