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Technical Hydraulic Emergency/Park Brake

Discussion in 'The Hokey Ass Message Board' started by seb fontana, Jan 23, 2019.

  1. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,459

    seb fontana
    from ct

    Title meaning can you use the hydraulic brake system for park/emergency brake..Will keeping pressure in the system be detrimental to longevity? I ask because I am noticing that ATV's are just locking the master cylinder in brake applied position for the emergency/park feature..
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 46,091


    Might not be very useful as an emergency brake, if it depends on the same system to apply, as the regular brakes do.

    Will it hurt stuff? I doubt it...
  3. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,099


    Well, it covers the "park" piece of it. The "emergency", not so much.
    Hnstray likes this.
  4. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,138

    from Idaho

    Not legally in most, if not all states.
    Black_Sheep and zzford like this.
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  5. G-son
    Joined: Dec 19, 2012
    Posts: 633

    from Sweden

    In some forms of car racing it's popular to have a hydraulic hand brake, either on the line to the standard rear brakes or a separate system with its own caliper(s) on the rear. Way more braking force than a standard mechanical hand brake.

    For a parking brake it usually isn't allowed on cars since even a microscopic leak will cause the brake to release in a while. For an E-brake I supposed it could be okay, at least the version with a completely separate system.
  6. coilover
    Joined: Apr 19, 2007
    Posts: 609

    from Texas

    Have used hydraulic caliper on a pinion mounted rotor that was a super park/E brake. Also the cable caliper on a pinion rotor that is also good since with either the braking force is multiplied by the rear gear ratio. When you run 5.14's the E-brake is awesome. The old trucks and Chrysler's had a drum and band on the trans output that was also a good brake.
  7. Truck64
    Joined: Oct 18, 2015
    Posts: 4,056

    from Ioway

    Street legal vehicles are supposed to have a redundant system independent of the regular brakes afaik. At least that's how it used to be.
    zzford likes this.
  8. Three Widow's Garage
    Joined: Jan 18, 2010
    Posts: 206

    Three Widow's Garage

    A buddy of mine is working on using Tesla electric parking brake calipers with rear disk brakes. The calipers are fairly compact and just need a simple bracket to mount. Not totally sure on the wiring, they are controlled through cars computer but looks like simple push button switches will work. we'll see.
  9. slim39
    Joined: Feb 13, 2013
    Posts: 68

    from pa

    In 1967 UPS delivery trucks had a Micro brake that worked with the regular brake system, They used them for a quick stop to deliver. They also had a hand emergency for parking for a long period at the terminal
  10. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,459

    seb fontana
    from ct

    Good replys, I hadn't thought of short term/long term....I have rear calipers coming but pretty sure there is no mechanical emergency/park mechanism; maybe I can add something..What I know of a caliper that has an additional park/emergency mechanicals has too small of a piston...

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