Emergency brake alternative

[trevor pordage]

i am finally getting down to the last things needed to get my GMC registered here in Australia
the PO had removed all the emergency brake hardware when he installed rear discs to all 4 rear whells so i have no lever in the cabin,
no cables etc. i have sourced a set of rear drums and need to run some cables and install some kind of actuator.
i am contemplating using some truck air springs mounted each side of the chassis outboard to pull on the cables to apply the rear drum brakes mounted
on rear set of wheels
i have thought about using a normally open solenoid so that if i lose air or electricity the brakes will apply. this will i hope satisfy the local
regulations of a failsafe operation.

i think i read somewhere that there were measurements of force needed to apply the brakes if so can someone point me to this info.
also please give any negative comments regarding my idea.

alternatively i could maybe use an electric actuator like Estopp but again i need some measurements of the force required so i can do calculations
the estopp has a max force of 600 pounds
--
Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project

 

[hal stclair]

I used an actuator that is rated for 700 lbs with Mannys Reaction arm disc's. I built a bell crank that the actuator pulled both cables together. The
700lbs is too much force for the Cad calipers, they want to bend the caliper arms. I have read about the force needed here on this site so hopefully
someone can point you in the direction for the write up.
Hal
--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1974 Eagle Bus 45',w/slideout

 

[chris tyler]

You may want to have an air tank/ resiviour to rapidly inflate the bags should the need arise. The compressor alone will take a while.
--
76 Glenbrook

 

[Matt Colie]

Trevor,

It is my carefully considered opinion (I really did think about this once), that the smart move would be to get a pair of gonzo-mama springs to pull
the brakes on. Then, like an air-brake truck, use air to pull the spring and release the brake. That way, it won't take off down the hill when the
air bleeds off.

Matt
--
Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
'73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
Now with both true Keyless and remote entry
SE Michigan - Twixt A2 and Detroit

 

[hal stclair]

> Trevor,
>
> It is my carefully considered opinion (I really did think about this once), that the smart move would be to get a pair of gonzo-mama springs to
> pull the brakes on. Then, like an air-brake truck, use air to pull the spring and release the brake. That way, it won't take off down the hill
> when the air bleeds off.
>
> Matt

That's the principal used on all air brake systems and its works well. Just a matter of adapting it to our use.
Hal
--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1974 Eagle Bus 45',w/slideout

 

[les burt]

Branscombe's brake presentations contain lots of technical details.

Look here:
http://www.bdub.net/branscombe/

Les Burt
Montreal
'75 Eleganza 26'
The EWIP (Eternal Work In Progress)

>

>> Trevor,
>>
>> It is my carefully considered opinion (I really did think about this once), that the smart move would be to get a pair of gonzo-mama springs to
>> pull the brakes on. Then, like an air-brake truck, use air to pull the spring and release the brake. That way, it won't take off down the hill
>> when the air bleeds off.
>>
>> Matt
>
>
> That's the principal used on all air brake systems and its works well. Just a matter of adapting it to our use.
> Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1974 Eagle Bus 45',w/slideout
>
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