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Thread: Lehman brake question

  1. #1
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    Default Lehman brake question

    I have a 2012 GL1800 with a S/A Lehman Monarch II kit with disc brakes.

    The brake system has a residual valve mounted on the axle housing where both Honda OEM brake lines connect too. From that value are 2 stainless brake lines that run to left and right rear caliper.

    My question is, I really don't understand the purpose of the residual valve with its bleeder, and then how is it used (and in what sequence) when bleeding the entire front and rear brake system.

    Side Note: The Lehman brake modification allows for the front lever to operate the front brakes only and the rear brake pedal operates both front and rear.

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    Default

    Looks like you have linked brakes, try this procdure

    Procedure:

    Give command to pump ( two times) and hold prior to opening each fitting.

    Continue at each location until fluid is visibly flowing and proceed to next location.

    Make sure that fluid reservoir is maintained during the procedure.

    1) Right rear caliper upper bleeder until fluid is present, then lower bleeder,

    2) Left rear caliper upper bleeder until fluid is present , then lower bleeder,

    3) Left front caliper 8mm bleed screw until fluid is present ,

    4) Left front anti-dive bleed screw until fluid is present,

    5) Right front caliper 10mm bleed screw until fluid is present .

    (Note) It take a while for any air to be chased out the front of the system. That is why this procedure cannot be performed just once.

    1) Right rear caliper upper bleeder until steady fluid flow, then lower bleeder,

    2) Left rear caliper upper bleeder until steady fluid flow , then lower bleeder,

    3) Left front caliper 8mm bleed screw until steady fluid flow,

    4) Left front anti-dive bleed screw until steady fluid flow ,

    5) Right front caliper 10mm bleed screw until steady fluid flow.

    Repeat above procedure at least two times until pedal is solid and does not pump up.

    Focus attention to the front because the air you are chasing has a long way to escape at the front wheel.
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
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  3. #3
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    Default

    Quote Originally Posted by durango9 View Post

    The brake system has a residual valve mounted on the axle housing where both Honda OEM brake lines connect too. From that value are 2 stainless brake lines that run to left and right rear caliper.

    My question is, I really don't understand the purpose of the residual valve with its bleeder, and then how is it used (and in what sequence) when bleeding the entire front and rear brake system.
    In 2009, I added a Wilwood 10 psi red brake residual pressure valve to my rear brake line. It simply maintains 10 psi on the brake fluid between it and the rear wheel cylinders to keep the seals and any hose full in slack times. 10psi is OK with drum brakes as they have return springs to pull linings away from the drums. 2 or 3 psi is for disc that have no return springs.

    I know of no changes needed for bleeding and I have never seen a residual pressure valve used in brakes to have a bleeder of it's own?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Default

    Thank you for your inputs.

    I do understand the purpose of the residual valve maintaining pressure to the rear lines but still unclear as to how the bleeder on the residual is used in the sequence.

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    Cool

    Quote Originally Posted by durango9 View Post
    Thank you for your inputs.

    I do understand the purpose of the residual valve maintaining pressure to the rear lines but still unclear as to how the bleeder on the residual is used in the sequence.
    What you have on your conversion is a Self Bleed Check Valve.

    Valves, or Flow Control Valves are used together they form a closed loop brake fluid system that allows small amounts of brake fluid to circulate every time the brake pedal is depressed, thereby eliminating the possibility of localized fluid boiling and build-up of gases within the brake fluid. Gases end up being vented back into the master cylinder reservoir rather than trapped within the caliper and brake lines.

    Jim Murphy
    EX-Lehman & Champion Dealer Owner Operator
    Iron Butt Rider 2001

    WHEN HELP IS OFFERED, A SIMPLE "THANK YOU" IS APPRECIATED.

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    Default

    Thanks Jim for jumping in. The residual has a typical banjo fitting on one end with a bleeder nipple.

    Do I need to bleed this nipple during a complete flush? and if so in what sequence would I do it in?

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    Default

    Quote Originally Posted by durango9 View Post
    Thanks Jim for jumping in. The residual has a typical banjo fitting on one end with a bleeder nipple.

    Do I need to bleed this nipple during a complete flush? and if so in what sequence would I do it in?
    Does it look like this? Blue.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Lehman res valve 2010.jpg 
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  8. #8
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    Default

    Quote Originally Posted by durango9 View Post
    I have a 2012 GL1800 with a S/A Lehman Monarch II kit with disc brakes.

    The brake system has a residual valve mounted on the axle housing where both Honda OEM brake lines connect too. From that value are 2 stainless brake lines that run to left and right rear caliper.

    My question is, I really don't understand the purpose of the residual valve with its bleeder, and then how is it used (and in what sequence) when bleeding the entire front and rear brake system.

    Side Note: The Lehman brake modification allows for the front lever to operate the front brakes only and the rear brake pedal operates both front and rear.
    This is getting confusing, even to me !!!

    They (Lehman) built a small amount of these conversions and the assembly manuals were not properly updated.

    The system is similar to the Monarch I excepting for the disc brakes.

    Click image for larger version. 

Name:	Monarch I brake line.jpg 
Views:	162 
Size:	38.2 KB 
ID:	81372
    Jim Murphy
    EX-Lehman & Champion Dealer Owner Operator
    Iron Butt Rider 2001

    WHEN HELP IS OFFERED, A SIMPLE "THANK YOU" IS APPRECIATED.

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