DCBS / LBS / Linked Brakes / My view of how it works and how I use it
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  • 9 Post By Ausblackbird
  • 1 Post By beestoys
  • 1 Post By deadman

Thread: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

  1. #1

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    DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    Hi All, I'm a bit of a defender of the DCBS and hope to share my thoughts on the system, so that new owners will have a better understanding of how the system works and how they can improve the Bird's standard braking performance. I read a lot about how riders only use the front brake lever, however they are not utilising a third of the braking performance built into the system (technically not correct but you'll get what I mean ). Using the foot lever, results in generating a lot more clamping force on all three discs, especially the front two disks which is what we want. I ride a Blackbird on the road, track days and motogymkhana. Using the front lever activates two pistons in both front calipers which then causes the front left caliper to rotate and 'activate' the secondary master cylinder (SMC) mounted on the left fork leg. The SMC then applies hydraulic pressure to two pistons in the rear caliper. I have no choice other than to apply front and rear brakes at the same time. However, if i require more braking power (i.e. at the end of a long straight 😳😳), I'll use the rear brake lever which then activates a third piston in all three calipers. Because there is now more hydraulic pressure being applied to all three calipers, the front left caliper will press harder on the SMC which in turn transmits even greater pressure to the two pistons in the rear caliper. Now i have all three pistons in all three calipers doing work. I can also apply a greater pressure through the foot brake lever (i.e. legs are a lot stronger than your right hand!) which further increases hydraulic pressure to the two centre pistons in the front calipers (higher clamping force) which in turn causes the SMC to generate a higher pressure to the two rear caliper pistons. The proportioning control valve (PCV) will however, regulate the pressure to the two rear pistons. If i apply too much pressure with my foot or hand which results in over pressurising the SMC circuit to the rear two pistons, a valve in the PCV will reach a preset level and will open which reduces hydraulic pressure (gradually to a set limit and always maintaining pressure for braking) to the two rear pistons to prevent rear wheel lock up (although it can still lock). But i can still apply greater foot brake pressure to the front centre pistons. That's a lot of clamping force and a lot better braking performance than just using the front brake lever! I didn't bother mentioning the delay valves function in the two front calipers centre piston circuit. No electronics involved. At least, I think that's how the Honda Dual Combined Braking System (DCBS) works. Thanks to fellow CBRXX.com members for the two SMC valve images. Please let me know if you have a different thought on the system. Cheers

    DCBS Front.PNGDCBS Rear.PNGDCBS1.JPGDCBS2.JPGDCBS3.JPGDCBS4.JPGDCBS5.JPGDCBS6.JPGSMC Alignment.jpgSMC check valve assembly 1.JPGSMC check valve assembly.jpg
    Last edited by Ausblackbird; 12-29-2019 at 5:29 AM.
    Howling, Greg.r, Punts and 6 others like this.

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  3. #2

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    Re: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    I'd like to also add that the delay valve also works as an anti dive unit as it brings the fronts after the rear has been activated.
    Ausblackbird likes this.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  4. #3

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    Re: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    Quote Originally Posted by beestoys View Post
    I'd like to also add that the delay valve also works as an anti dive unit as it brings the fronts after the rear has been activated.
    Hydraulic pressure from the rear master cylinder is applied directly to the front left caliper without delay. When pressure rises to a set level, the delay valve opens and pressure is then applied to the front right caliper at which point you can then apply a great deal of pressure to all centre pistons (especially the front!) giving you a lot of braking power which 'front brake lever only' riders are missing out on. The whole point to my post It's more of a squat inducing valve then an antidive unit

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  6. #4

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    Re: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    Yep
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  7. #5

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    Re: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    I dont care how it works, But it does work and I love it, Yes, Im a front lever only, Bird rider,
    Back wheel locked up one day, when I used the rear brake, The rear pedal piston was covered with grime and wouldnt let go,
    Bit of a clean up on the side of the road and all was working again,
    Every now and then I use the back brake pedal now just to make sure its still working,
    Coming down a long steep gravel road, I use the gears and back tyre to slow down,

    Compared to my Bonnies 8 inch twin leader, Which I refused to use as it put me on the deck,
    Locked up if you even breathed on it,
    It was back to second and drop the clutch, Harsh, But it worked also,
    Ausblackbird likes this.
    If ya not Boppin, Ya in ya coffin. Rock and Roll will soothe your soul.
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  8. #6

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    Re: DCBS / LBS / Linked Brakes / My view of how it works and how I use it

    Nothing beats a good braking technique....... long gone are the bad old days when HD riders used to only use the rear brakes on their raked out 70's choppers (and many riders died as they just couldn't stop in time......).

    I use both brales, all the time, but I vary the pressure used at each end to suit the application. There is an excellent Utube video I saw on the KTM forum..... best I've ever seen that explains the why/how/what for, really well...... I'll try to find it again - it's a brilliant reminder of why we need to refresh our thoughts and break any old habits...... a few minutes viewing could save a life....

    PS I searched and searched, but couldn't find the video, so ask Dr Google if anyone wants to refresh their braking technique's........ it's well worth doing just to make sure no bad habits have crept in over the decades..
    Last edited by Aussie Dave; 01-02-2020 at 6:07 PM.


 

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