Brake pressure switch
 

I would like to know what you guys are using for a brake pressure switch to use on a two step? I heard that there is one from a company called GEMS. But, I did not see anything in Grainger etc. If someone would recomend a switch and from where I would appreciate it. I heard that a brake pressure switch from a production car would work? I don't know if that is true. Any help would be appreciated.

Robert

Re: Brake pressure switch
 

Re: Brake pressure switch
 

I bought mine from GEMS. The website is kind of goofy and there are alot of options on how you want the switch to be made.

Re: Brake pressure switch
 

Call Gary Stinnett, he sold me one.

Re: Brake pressure switch
 

I've been using the one that came stock on my 64 Falcon. Screws into one of the ports on my linelock now that I'm using a non stock master cylinder. It's nonadjustable so I adjust reaction times with tire pressures. :)

Jeff

Re: Brake pressure switch
 

I haven't checked yet, but I've been told that a Volkswagen brake light switch (not sure what year) will work.

Re: Brake pressure switch
 

This is what I am using.
Gems PS61-35-2MNZ-A-FL18
P/N 2226644

Your needs and results may very.

Re: Brake pressure switch
 

Notch1320, thank you for the info. I tried contacing the man you suggest but he said that I have to order the 10 min. So that will not work.

Phillip, where did you buy your GEMS switch from? I left a messsage with GEMS with no return yet. Any suggestions would be appreciated.

I have thought about the stock brake pressure switch but the ones I have found have a very low pressure on them? I might be wrong.

Thanks, please keep the ideas coming.

Robert

Re: Brake pressure switch
 

I ordered it from the website.

http://www.gemssensors.com

They have a bunch of options but the one I ordered did what I wanted it to do and they pressure setting is adjustable unlike the old ford and VW switch's.

Re: Brake pressure switch
 

Phillip, I tried to order online at GEMS, but it would only allow me to order 10 at minimum. I will try again, that is why I tried to call them. Thank you for the info I will look up the switch you use.

Robert

Re: Brake pressure switch
 

I ordered four when I bought mine. Even if you had to buy 10 you could probably sell the extrs here,lol

Re: Brake pressure switch
 

Robert pm me I have had the same problem with min of 10 to order. I need a couple of switches also.

Re: Brake pressure switch
 

I could use a couple or three myself.

Re: Brake pressure switch
 

A good parts guy can find one..... they are preety comment..... I think they are used a lot in tow motors......... I pay about $10 CDN to prob 15 now for one.......

Re: Brake pressure switch
 

Why does this switch need to be adjustable?
If you are using an adjustable switch, must you install a brake pressure guage?

Re: Brake pressure switch
 

Adjustable helps you adjust your reaction time. There is a point of diminishing return. I don't use a pressure gauge, but I always check it for muscle memory right before I pre-stage.

Re: Brake pressure switch
 

OK, then let me ask this.
Is it required that the pressure switch be installed before the line lock on the front brakes?

It would seem to me that installation after the line lock would circumvent the "two step applied by brake" rule. If you install it after the line lock, all you would need to do is step on the brake, apply the line lock, and the line lock pressure would hold the front brakes and the two step pressure switch closed. And we all know the line lock switch can be mounted any place you desire.

Re: Brake pressure switch
 

i have found a very good quality pressure switch through my hydraulic company. it is adjustable and has both n/o and n/c polls, and is setup with a hershman type connector. It has a 1/4 npt nipple. not for the faint hearted if you think its gonna be cheap tho! it runs right around $60 each. i plan on using mine for nothing other than connecting a ground to a red warning light that tells me i have my pedal down to the same location each time in my foot brake stocker. i run a button on my pedal for the two step. i have bursted a brake line at the starting line once and was able to win the round cause the car didnt launch till i wanted it to (the other guy went red behind me!). with a pressure switch in the system opperating the two step the car would have taken off as soon as the pressure dropped.

just my two sense!

Ian

Re: Brake pressure switch
 

Dean, how I am going to do mine is install it between the master cylinder and the line lock. This way when the line lock is applied the pressure switch will not be applied. Lastly, I am putting a switch on the shifter that is in series with the pressure switch, it will only complete the circuit when the shifter is in low gear so that when I am going down track and need to apply the brakes it will not activate the two step. I have seen people put this switch on a toggel to turn it off when in high gear. But I run allot of 1/8 mile and things happen real quick and it is just one more thing for me to foget to do..LOL...Hope this helps

Re: Brake pressure switch
 

Ian, that's how I have mine installed. When the rule changed, I removed my button from the console and installed it in the pedal.
No special switch, no concern over installing in front or rear hydraulics, no concern over front to rear bias, and no pressure guage.
Just step on the brake and simultaneously activate the switch.

Re: Brake pressure switch
 

OK, I just have to ask:
Since the car is going to move the instant the pressure falls below the switch pressure and the engine goes from it's chipped RPM to converter stall speed (regardless if the brakes are fully released or not and regardless of front to rear bias), WHAT difference does it make if the switch is in the front or rear hydraulics?

Re: Brake pressure switch
 

I use a switch from PDI PDAH-4-4M-C-FL-9. There are older versions of this switch that have a similar part number. There are a couple of these currently on ebay.

http://www.ebay.com/itm/PDI-PPDI-PDA...item35ac4b4a0d

http://www.ebay.com/itm/DYNAMIC-AIR-...item1c25be9020

You need a second switch in series on the shifter in first gear position so that the brake pressure will closed the micro switch when you step on the brake at the starting line and the switch on the shifter most be in first gear and closed also for the two step to be activated. This prevents the two step from activating at the finish line if you foot brake at the stripe. I use a common bump switch for the shifter mounted on a small bracket. I brake pressure gauge with a small light built into it is also a good option also. The pressure switch must be installed with the red wire (Normally open) and also the black wire = common. The pressure switch is adjustable, remove the screw from the top of the switch, using an 1/8 allen wrench to adjust clockwise to increase set point and counter-clockwise to decrease set point. Then replace the screw. Works by staging, stepping on the brake hard, stepping on the gas, releasing the brake to launch.

Re: Brake pressure switch
 

If you put it in the front brake line your starting line rev limiter will be activated when you have pressure held line lock on in the burnout.

We put the pressure switch that Brian and Nick Folk sell in our stocker a few weeks ago and tested with it Memorial day weekend. It is deadly consistent in the r/t department for our car and easy to adjust.

Re: Brake pressure switch
 

Not if you install it before the line lock.

Re: Brake pressure switch
 

Yes true.... Fronts brake line will work if before the line lock.

Re: Brake pressure switch
 

Is there anyone who needs one of these switches I mentioned earlier in the thread? I have changed switches, and ill let mine go. Single switch vs. having to buy a minimum of 10.

I paid $67 and only ordered one. (I will take $50 shipped)

The pressure adjusts from 250 PSI to 1000 PSI. Part # 209506