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. 
 

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

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.

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

Bullet Bob wrote:

Or this looks even better...may go this way myownself.

https://www.speedwaymotors.com/Speedway-Park-Lok-Universal-Hydraulic-Parking-Brake-Line-Lock,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.

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.

Bet you still use wheel chocks as well Gary.

Bullet Bob wrote:

Or this looks even better...may go this way myownself.

https://www.speedwaymotors.com/Speedway-Park-Lok-Universal-Hydraulic-Parking-Brake-Line-Lock

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)

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)

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.

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?

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.