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Username Post: Dual Brake Switch for 700r4 Lock-up?        (Topic#365056)
Posts: 21
Reg: 03-12-19
04-29-21 08:36 AM - Post#2818986    

I want to hook up the torque converter lockup to a dual brake switch (one for the brake lights and the other for the torque converter lock-up) but my 55 truck has the original style brake switch (that mounts to the firewall in the engine compartment and has a spring loaded arm resting under the brake pedal arm), and I haven’t found a dual switch in that style online.

What have you guys done to solve this problem?

Since I can’t post images, here is a link to the same post, with an image of the original switch on the tri-five truck forum. itch-...

"55 Cameo w/409

Edited by unclebrad on 04-29-21 08:37 AM. Reason for edit: No reason given.


55 Shaker 
Posts: 1603

Age: 71
Loc: north central IL.
Reg: 03-13-06
04-29-21 10:22 AM - Post#2818994    
    In response to unclebrad

I haven't done it. But is there a way to mount two 55 switches one for the brake lights and one for the tranny. Just a thought.

The older I get, the more dangerous, I am !!!!

Posts: 21
Reg: 03-12-19
04-29-21 04:13 PM - Post#2819013    
    In response to 55 Shaker

Physically, that could be done, but the "dual" switch for a lock-up is configured so that one of the "switches" is open (off) by default, and when the brakes are applied, it energizes the brake lights.
And, if I understand it right, the other switch is closed (on) by default and when the brakes are applied, it cuts the juice to the torque converter lock-up solenoid.
It might be possible to take an original switch apart and get it to do the reverse of what it was made for, but I'm sure lots of people have dealt with this issue and am hoping one of them can enlighten me.

"55 Cameo w/409

Edited by unclebrad on 04-29-21 04:18 PM. Reason for edit: No reason given.

Mike JW 
"9th Year" Gold Supporting Member
Posts: 1500
Mike JW
Loc: Arroyo Grande, CA
Reg: 01-19-06
04-30-21 08:41 AM - Post#2819046    
    In response to unclebrad

Try Bowtie Overdrive they may have what you need.

"16th Year" Gold Supporting Member
Posts: 1489
Loc: Chandler(it's a dry heat)...
Reg: 04-26-04
05-01-21 10:57 AM - Post#2819085    
    In response to Mike JW

wire a 12 v bosch style relay from the 12v out of the sw., use the nc contacts of the relay in your circuit.

'56 3100 Short Stepside Someday
2001 Chevy Suburban 2500
2009 Saturn Vue w/20's

Member: Desert Classic Chevy's Inc.
Monty's 56 Truck
Avatar is my Truck

Posts: 38

Reg: 09-24-20
05-01-21 02:21 PM - Post#2819092    
    In response to monty56

I don't want to speak for Unclebrad, however I think he was hoping someone knew of a dual switch with a NO/NC that would be an easy installation into his truck that would activate the brake light and deactivate the lockup TCC. Preferably one like the original, that mounts in the original position to make it a clean installation. If not, he can go with an adjustable vacuum switch, "and" "or" an inline brass T on the rear brake line under the cab with a NC pressure switch. The Bosch relay should not be necessary unless either the vacuum or pressure switch is not rated for the TCC solenoid which I believe they are.

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Posts: 1659
Age: 73
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Reg: 10-26-04
05-01-21 09:23 PM - Post#2819120    
    In response to Impalas4ever

The easy way would be to use a combination brake/cruise switch from any 70's or so GM vehicle. Exactly what I used on my 57. One set of N.O. contacts and one set of N.C.
Mounting would be the next challenge as it is not a lever switch but a pushbutton style.


57 210 4dr. Wagon(bought '82)
-350/700r4 Mild Custom
29 Ford Sedan(bought '75)
-4.3L/TH350(in progress)

Posts: 38

Reg: 09-24-20
05-02-21 02:02 PM - Post#2819172    
    In response to WagonMan


That absolutely would be the easiest way. Is there a way for Unclebrad to put one of those switches under the dash on the brake pedal assembly in a 55 cameo? How did you do it?


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