parking brake on warning mod?

[davesgmc]

Has anyone ever put a switch on the parking brake lever to hook to a light to warn that the parking brake is on? I saw that the M35A3 has a switch on its lever and looks like it could be adapted to other applications?
I have a tendency to leave mine on and drive off a lot of the times. was also thinking about hooking it into a buzzer like the low air pressure warning type too.

 

[AceHigh]

Here is the switch you are referring to. It also has a LED red warning light on the dash. I think the circuit goes from a hot source to the light to the switch to ground.

http://www.eriksmilitarysurplus.com/pabrswform31.html They are out of stock right now.

On my trucks you can't forget it and drive off because the truck won't move with the brake on. Yours might be out of adjustment or need new shoes. It is a good mod though.

 

[zebedee]

Has anyone ever put a switch on the parking brake lever to hook to a light to warn that the parking brake is on?
I have a tendency to leave mine on and drive off a lot of the times.

I am wondering if you have it adjusted correctly... if you CAN drive off?

How about putting an airspring in place of the cable and converting it to 120 psi. Won't move then! And yes it has been done very successfully.

 

[Tlauden]

I am wondering if you have it adjusted correctly... if you CAN drive off?

How about putting an airspring in place of the cable and converting it to 120 psi. Won't move then! And yes it has been done very successfully.

Might have to look into this idea, has it been done by someone here??

 

[zebedee]

........ has it been done by someone here??

We will soon find out...

All I know is that the Aussies did it to their M816s.

 

[davesgmc]

nope, its adjusted right. i just got that much power!

 

[rrrr]

I put one on my M35A2. Works great !

 

[doghead]

I can smell it when I leave mine on!

 

[rrrr]

I can smell it when I leave mine on!

I've never done that before DH.

 

[Recovry4x4]

I know one collector in TN that installed the air chamber to apply and release his parking brake. The gearing is such that the engine has no problem breaking the parking brake loose, the drivelines have a tougher time. FWIW I've received trucks that had the warning light in place. I'm sure they were unit mods and they used the lever type brake light switch from the M151 for the install. Its is possible to hook the light up to the low air buzzer as well. THAT will remind you for sure!

 

[davesgmc]

"WHAT IS THAT LOW AIR PRESSURE BUZZER ON FOR?? I HAVE good air pressure!" oops, must be the parking brake,,,,,lol

 

[73m819]

Thought there was a MWO that had a retro fit kit that did just this

 

[peashooter]

I have a late model 109 that came with the brake light. As someone suggested you just need the switch that will bolt to your existing parking brake, and they have a LED brake light (not cheap though..$40). when you pull the brake up, it just closes the switch and to ground and turns the light on. You can attach it to the center of your instrument cluster like the late model ones. I just recently built a instrument cluster for my truck that mounts to the steering column and have the light in that so its right in front of me now, also have a red warning light for low air pressure since I now have headsets and probably wouldnt hear the low air buzzer while driving.

http://www.eriksmilitarysurplus.com/pabrswform31.html
http://www.eriksmilitarysurplus.com/pabrwali12.html

 

[patracy]

My 931 came with what you speak of.

I will be disabling it soon.

 

[patracy]

Ok I was reading another thread that gave me a link to the alarm system. It seems that Pin I into the alarm sounds off when the parking brake is on.

Connector wiring:
A, from engine ignition circuit
B, blackout override input
C, not used
D, to engine temp switch
E, to engine over temp light
F, to air pressure switches
G, to low air warning light
H, ground
I, to parking brake switch
J, to parking brake warning light

My thoughts are to cut this pin inbound to the module. I haven't looked any further, but I assume there's a neutral safety switch as well on the transmission. My thoughts are to use a 24v relay that is triggered off that. When the transmission is in neutral, the relay could cut the signal to the module. (And perhaps I could wire in a diode to the parking brake indicator light and allow that to illuminate the parking brake light from a feed above the diode) Then when the transmission is shifted out of neutral (and the brake is on) the relay would kick back on and cause the buzzer to kick in. Giving you the best of both worlds. A simple light when the truck is in neutral and no buzzer with the brake on. And a buzzer/light when the truck is in gear/brake on.

Again, I'll have to study the wiring more to find out if this is feasible. (Hinges around there being a neutral safety switch)

 

[M813rc]

I will look forward to seeing this mod when you do it (I'm not smart enough to figure it out on my own). The parking brake alarm in my 931 drives me nuts! (Short trip..)

Cheers