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Would this work and how could it be plumbed to actuate the rear disks, not the e-brake mechanism just the disks.
My initial idea of a "T" in the rear brake line would just push brake fluid back to the Master cylinder, right?
Just trying to make something simple more complicated, but that's just me.
Ideas anyone ??
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From what I see, you would have to isolate the fronts to firewall master and rear to hand brake master.
Then daily driver would be a pain in arse.
Two braking systems just to drive around town.
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Rear brake line goes through the hand brake. The hand brake pressurizes and applies the rear brakes only. Think of it like a second master cylinder, it just doesn't have a reservoir. It won't effect brake system pressure in front of the master cylinder, just behind it. The brakes run like 1,000-2,000psi of pressure, but the master cylinder reservoir sees almost no pressure or it would explode.
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Planning on doing some drifting eh Rudi are ya?
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Doesn't look like it locks in the "brake on" position so it probably won't work for a emergency brake unless you modify it so it latches with the rear brakes locked
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TKOPerformance wrote:
Rear brake line goes through the hand brake. The hand brake pressurizes and applies the rear brakes only. Think of it like a second master cylinder, it just doesn't have a reservoir. It won't effect brake system pressure in front of the master cylinder, just behind it. The brakes run like 1,000-2,000psi of pressure, but the master cylinder reservoir sees almost no pressure or it would explode.
OK, so let me get this straight.
Rear brake line form the master cylinder to the "In" of the small hand operated cylinder and the from there to the original line to the rear disks? Plumbed in series so to speak.
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John Ha wrote:
Doesn't look like it locks in the "brake on" position so it probably won't work for a emergency brake unless you modify it so it latches with the rear brakes locked
In my original post I mentioned a latch for that, sorry I did not mention that in this post.
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Or, you might be able to use a line-lock only on the rears instead of the fronts. Just a little electric solenoid valve.
BB1
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Or this looks even better...may go this way myownself.
I can't make the link work so if you have trouble just Google "speedway Park-loc" $29.95.
BB1
Last edited by Bullet Bob (3/30/2020 11:19 AM)
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Bullet Bob wrote:
Or this looks even better...may go this way myownself.
,1970.
I can't make the link work so if you have trouble just Google "speedway Park-loc" $29.95.
BB1
They say not for use with DOT 5, so it's not for me, looks OK though.
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Rudi wrote:
John Ha wrote:
Doesn't look like it locks in the "brake on" position so it probably won't work for a emergency brake unless you modify it so it latches with the rear brakes locked
In my original post I mentioned a latch for that, sorry I did not mention that in this post.
D'oh! My bad. I didn't realize this was already discussed elsewhere, although I probably should have figgured that out from the title.
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Rudi wrote:
TKOPerformance wrote:
Rear brake line goes through the hand brake. The hand brake pressurizes and applies the rear brakes only. Think of it like a second master cylinder, it just doesn't have a reservoir. It won't effect brake system pressure in front of the master cylinder, just behind it. The brakes run like 1,000-2,000psi of pressure, but the master cylinder reservoir sees almost no pressure or it would explode.
OK, so let me get this straight.
Rear brake line form the master cylinder to the "In" of the small hand operated cylinder and the from there to the original line to the rear disks? Plumbed in series so to speak.
Yep, pretty sure that's how they do it.
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I have a line-lock in my airplane. It makes for great short field landings. Set the line-lock, pump the brakes and land. A lot of rubber is left behind but you stop fast.
Seriously, it is used as a parking brake.
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Bet you still use wheel chocks as well Gary.
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RV6 wrote:
I have a line-lock in my airplane. It makes for great short field landings. Set the line-lock, pump the brakes and land. A lot of rubber is left behind but you stop fast.
.
Ok for trikes would not have worked well on my tail dragger.
I do have a line lock on my Mustangs front brake line, hmmm.
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Bullet Bob wrote:
Or this looks even better...may go this way myownself.
I can't make the link work so if you have trouble just Google "speedway Park-loc" $29.95.
BB1
i went to that link and got a pic of a GTO/stang. Looks like a mustang with a fairlane front. Not sure where they com up with GTO??
Last edited by Cab4word67 (3/30/2020 5:21 PM)
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Just mount two calipers on each rear wheel and plumb as you like, keeping them separate. But I never have liked the idea of trying to hold hydraulic pressure on a brake system over any length of time.
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MS wrote:
Just mount two calipers on each rear wheel and plumb as you like, keeping them separate. But I never have liked the idea of trying to hold hydraulic pressure on a brake system over any length of time.
Gives me pause as well. The system isn't designed to be used like that.
Last edited by TKOPerformance (3/31/2020 1:06 PM)
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KISS I might go pinion disk and mechanical caliper with an electric linear actuator my original idea from last year.
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MS wrote:
Just mount two calipers on each rear wheel and plumb as you like, keeping them separate. But I never have liked the idea of trying to hold hydraulic pressure on a brake system over any length of time.
Most aircraft use the retained hydraulic pressure type of parking brake, but like any mechanical system, it all depends on the condition of the system - i.e. how tight the seals are in order to hold the pressure over time. They all eventually will leak down. The FAA only requires that they hold the aircraft brakes for a minimum of 90 seconds so that during an emergency evacuation, the aircraft will not move. Because the systems will eventually leak down, standard procedure is to also install wheel chocks whenever the aircraft is parked. I have to agree with MS about not relying on a hydraulic brake to keep a vehicle from moving while parked.
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The 1957 Cessna that I learned to fly in had a parking break similar to what is in the Mustang. Pull on the handle and the cable pulled the top of the brake pedal forward simulating someone stepping on the brakes. It was only for use on slope windy situations so the pilot could get out and place the wheel chocks.
The line-lock in my RV-6A basically does the same thing. It keeps the aircraft from moving long enough to set the chocks. The pressure will bleed down overnight and a preflight check makes sure the P-Brake is OFF.
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Just curious... What is wrong with the original parking brake system that uses cable? Simple, effective, works in dead-battery condition and does not bleed down over time?
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RV6 wrote:
The 1957 Cessna that I learned to fly in had a parking break similar to what is in the Mustang. Pull on the handle and the cable pulled the top of the brake pedal forward simulating someone stepping on the brakes. It was only for use on slope windy situations so the pilot could get out and place the wheel chocks.
The line-lock in my RV-6A basically does the same thing. It keeps the aircraft from moving long enough to set the chocks. The pressure will bleed down overnight and a preflight check makes sure the P-Brake is OFF.
I've spent some time jamming myself under the instrument panel trying to service those Cessna brake reservoirs behind the rudder pedals. Oh, the good old days..... :-)
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MS wrote:
Just curious... What is wrong with the original parking brake system that uses cable? Simple, effective, works in dead-battery condition and does not bleed down over time?
The MK VIII caliper has a hokey lever operated cam with some internal balls that activate the piston.
I never liked it much for lack of holding power.
I don’t much like the e brake handle that hangs under the dash either.
A short mechanical e brake handle won’t work with a full console.
The long hydraulic lever might fit better between the seat and console.
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