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Old 09-02-2018, 03:44 PM
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Hydraulic emergency brake

I've had this hydraulic brake lock thing for over twenty years and now would like to use it in my T bucket as a parking brake. Was told it's a no-no. Whyzat? Ive seen heavy equip with the buckets and blades parked blade/bucket in the air. Confused. Hydraulic gurus...HELP!

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Old 09-02-2018, 04:24 PM
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Couldn’t tell ya.
A line lock solenoid works pretty well though.
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Old 09-02-2018, 05:13 PM
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When my son was in High School, we bought a '72 Chevy Luv truck with no motor in it. It had had a SBC in it and was a hot street/drag truck, but the fellow blew the motor up. It was fitted with a narrowed 10 1/4" Olds diff with 4-something gears and a posi. We replaced the gears with a 3.90 set and installed a warmed over 455 Olds with TH400 auto.

I drilled a hole in the floor just to the left of the driver's seat and installed a quality on/off hydraulic switch with a lever that turned 90 degrees between on and off, then plumbed it into the brake line that went to the rear brakes. To lock out the rear brakes and do a burnout, we just turned the handle 90 degrees and used the regular brakes to hold the front brakes in the water box. At the end of the burnout and before staging, we would give the valve a 1/4 turn the other way and we would have 4-wheel brakes again.

You could do the same thing to lock the rear brakes as a parking brake by pushing down on the brake pedal and then turning the switch 1/4 turn to trap the pressurized fluid in the rear brakes.
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Old 09-02-2018, 10:36 PM
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E-brake

Whole idea of an E-brake is that it's independent of the regular braking system. If you have disc on the back you can add a caliper.
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Old 09-03-2018, 12:14 AM
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The OP said parking brake, not emergency brake.
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Old 09-03-2018, 06:44 AM
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Brakes

Title says "hydraulic emergency brake" Do you have disc on the back?
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Old 09-03-2018, 07:12 AM
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The rears are drums. Am thinking of plumbing it in on rear line. It has a knob that is push/pull to operate. Am concerned that the constant pressure, while on, could cause the wheel cylinders to leak. I don't know hydraulics, have to ask. Thanks!
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Old 09-03-2018, 07:16 AM
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Ooops! Sorry about the "emergency brake thing. I was in a hurry, not thinking. I want it as PARKING brake. My bad.
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Old 09-03-2018, 08:02 AM
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Brakes

As long as your device is mechanical and does not need 12 volts to operate I think it would be fine. No reason constant pressure should blow out a seal. Make sure you position the knob where it won't be accidentally pushed while going down the road because then you would have NO brakes.
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Old 09-03-2018, 08:23 AM
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The problem with a hydraulic parking brake is that ALL hydraulic systems eventually leak and loose pressure. As the seals wear, that will take less and less time. Not a preferred solution.
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Old 09-03-2018, 12:21 PM
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Yes I have used them in trucks for years.

Here is the problem with them.

In order to use them as a parking break you need to pressurize your break lines then shut the gate or ball which "traps" the pressure in the line.

Fluid does not like to be pressurized it will always try to return to it's natural state. While you pressing on your brakes multiple times works fine that fluid is always moving and the work load of the cylinder(s) is limited to a few seconds at most between several minutes at rest.

When you use a "line Lock" that cylinder has 100% load on it at all times. This can lead to increased wear on the seals and leaks. A majority of the time your leaks will be at the gate/ball as that is opened and closed many times in a somewhat unregulated manner.

You need to apply the brakes enough to Hold the car. Crush the pedal to the floor traps mo pressure in the lines then what is needed. If you apply your brakes to just hold the car then go a little bit past before applying the "lock" your seals will last much longer then going to the floor with the thing.


Leaks at the "lock" or at the cylinder introduce air. Which decreases pressure and releases the brakes. Then you get to run out of the store and jump into the moving thing.

Now like I said I have been using them for years. It eliminates the need for mechanical and as long as you watch your brakes is not a big deal.

For short term parking like at a gas station or to lock the front tires for burning out they work great.
But for the long term stuff like parking overnight you really should use a mechanical setup. At the very least put the thing into gear so that if it does release break fluid the gearbox will keep the thing from rolling into the bushes.


For overnight parking the use of a independent mechanical parking break can be used. This is a mechanical cable setup which you add to one wheel. I like to use the the front drivers wheel which makes cable routing easy and clean.

You can also find these on "sports cars" in yards. But here is a Wilwood one for reference.

https://www.summitracing.com/parts/w...iABEgLlQvD_BwE

They don't use any hydraulics or affect your hydraulic brakes in any way.
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Old 09-04-2018, 07:18 AM
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Ok, I'll step up with the dumb question here..

What's the difference and changes made regarding the system hardware devices ?


Pep

Quote:
Originally Posted by techinspector1 View Post
The OP said parking brake, not emergency brake.
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Old 09-04-2018, 07:28 AM
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That kind of begs the question, if the OP has a mechanical emergency brake, why does he need a hydraulic parking brake?

If he doesn't have a mechanical e-brake, he's got a bigger problem.
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Old 09-04-2018, 12:39 PM
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Things like articulation, rust, previous owner cut the cables out, exhaust or other in the way, or having a automatic. Are a few reasons why you would want a line lock over a mechanical setup.

Placing the cable down to the front driver's wheel eliminates most issues with articulation in most setups.





Your not talking about a hydraulic parking break for drifting right?
If that's the case just run a mini resivior hydraulic clutch sized to mini calipers. Totally separate from your main break system.
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Old 09-04-2018, 05:02 PM
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Quote:
Originally Posted by cerial View Post
Things like articulation, rust, previous owner cut the cables out, exhaust or other in the way, or having a automatic. Are a few reasons why you would want a line lock over a mechanical setup.
So, still no emergency brake...

Sorry, none of those are reasons not to have a functioning mechanical e-brake, just excuses to use after your hydraulic brakes go out and you run into something.
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