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Author Topic: single front disc  (Read 8322 times)

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hogasm

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single front disc
« on: February 11, 2007, 09:57:23 AM »
Installed a single 13" front disc from Performance Machine and their 6 piston caliper. Used the stock 11/16 bore master cylinder. Brake feels mushy.

What difference does the 9/16 bore have from the 11/16 bore master cylinder when used with a single disc and caliper?

Should I switch out the 11/16 for a 9/16 when using the single caliper?
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Re: single front disc
« Reply #1 on: February 11, 2007, 10:46:40 AM »
Which bike? No pictures? :nixweiss:

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Re: single front disc
« Reply #2 on: February 11, 2007, 11:43:36 AM »
Quote from: hogasm on February 11, 2007, 09:57:23 AM
Should I switch out the 11/16 for a 9/16 when using the single caliper?
Yes is the short answer.

I went the other way on a build and had similar results.

How do you feel you did on the bleeding of the brakes? Do you have a firm lever but a soft brake? (sounds all wrong! ;) ) I believe your moving the volume of fluid but it's pressure you after which the larger bore MC isn't giving you. Than again I could be wrong. :)
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Re: single front disc
« Reply #3 on: February 11, 2007, 12:29:46 PM »
You need the single caliper master (9/16") for proper operation. As puzzled stated, you won't get the right pressure. I had a caliper go bad on a '95 Dyna and plugged one port of the Ness brakeline tee before I fixed it. The brake feel and response was definitely noticibly worse. That was enough proof for me. I run a single caliper master on a single 4-piston differential bore PM front brake on my Pro Street. Brakes are great. No problem whatsoever! ;) Hoist! 8)
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crshnbrn

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Re: single front disc
« Reply #4 on: February 11, 2007, 02:50:17 PM »
Quote from: hogasm on February 11, 2007, 09:57:23 AM
Installed a single 13" front disc from Performance Machine and their 6 piston caliper. Used the stock 11/16 bore master cylinder. Brake feels mushy.

What difference does the 9/16 bore have from the 11/16 bore master cylinder when used with a single disc and caliper?

Should I switch out the 11/16 for a 9/16 when using the single caliper?

 I have ridden a few touring bikes where the right front caliper has been removed to show more of a custom front wheel, and the original 11/16" bore front master cylinder was retained.  There was very little lever movement before the brake began to apply because the master cylinder was displacing enough fluid for two calipers, but it took more lever effort once the brake did apply.  Your front brake lever should have less travel now that you have only one caliper.  It definitely should not be mushy.

"He who has no brakes will stop at nothing." 
 - words of wisdom seen scrawled in the salt-spray-covered back door of a semi trailer
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hogasm

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Re: single front disc
« Reply #5 on: February 11, 2007, 08:16:19 PM »
New front tire

Metzler 880   120 on 21"x3.25" Performance Machine rim   and 6 piston caliper with 13" rotor
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hogasm

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Re: single front disc
« Reply #6 on: February 11, 2007, 08:19:05 PM »
Left side.......oh yea new front fender.
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hogasm

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Re: single front disc
« Reply #7 on: February 11, 2007, 08:21:00 PM »
Waiting on flush axle kit and a few other misc OCD parts
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Re: single front disc
« Reply #8 on: February 11, 2007, 08:25:01 PM »
Brian,
That looks awesome, good job. :coolblue: :2vrolijk_21:

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Re: single front disc
« Reply #9 on: February 11, 2007, 11:36:59 PM »
Wow Brian it looks fantastic. As you know I am doing a wheel swap as well but I didn't do the 21 I wish I would have but it wasn't in the cards. I am going to retain the dual disc though just in case I ever sell it i can keep my wheels. And I like the stopping power of two discs. But I want to see a full side view of your bike it must be great. Later Bro,Q
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Re: single front disc
« Reply #10 on: February 12, 2007, 08:17:59 PM »
That looks great Brian :2vrolijk_21:

Where did you get the paint codes? From the photo's it looks right on :)

Is that a fat baggers front fender? If not, it sure looks like one.

Lookin' good  :drink:

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Re: single front disc
« Reply #11 on: February 12, 2007, 08:24:59 PM »
Brian, there might be some slight differences in "feel" of the front brake lever.  But "mushy" should not be it.  Especially given the overall small volume of fluid bled is bled.  It's actually a lot more of an issue going to dual brakes with a smaller master cylinder than it is the other way around. 

The bike is an 04.  So it's probably got DOT 5 (aka, silicone) brake fluid in it.  Any time you've got a mushy brake pedal on a DOT 5 system blame the fluid until proven otherwise.  It is so easy to entrain air in that fluid.  If you pumped the lever fast during braking you caused a problem.  If bottle of fluid got shook up much in handling really anytime in the couple of weeks prior to its use you caused a problem.  DOT 5 is good stuff (for it's purpose).  But it's a pain in the arse to work with.
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hogasm

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Re: single front disc
« Reply #12 on: February 12, 2007, 08:38:06 PM »
Quote from: Grover on February 12, 2007, 08:17:59 PM
That looks great Brian :2vrolijk_21:

Where did you get the paint codes? From the photo's it looks right on :)

Is that a fat baggers front fender? If not, it sure looks like one.

Lookin' good  :drink:



Milwalkee Iron I think makes Fat Baggers fender. All the measurements are the same and costs half as much
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hogasm

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Re: single front disc
« Reply #13 on: February 12, 2007, 08:40:19 PM »
Switched to a 9/16 master cylinder. Will see Wednesday if it makes any difference.
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Grover

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Re: single front disc
« Reply #14 on: February 12, 2007, 08:52:59 PM »
Quote from: hogasm on February 12, 2007, 08:38:06 PM
Milwalkee Iron I think makes Fat Baggers fender. All the measurements are the same and costs half as much

I wish I'd have known that before I got bent over by fat baggers! Damn!!
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