Anti-lock Brakes

[fox]

I studied The circuits on the 4W anti- lock brakes and may have an answer for us guys who cannot drive them and feel safe.

Also I have a new truck coming any day and won't try this on the trade-in truck for obvious reasons.

I will try it on the new one asap when it arrives. Here goes:



On top of the brake controller, ( which is to the fender side of the master cylinder ) Is two plugs . One is a 14 pin the other is a 4 pin. The 4 pin contains the wires for the front sensors. Pins 1 and 2 are the left front wheel and 3 and 4 are the right. Disconnect them and spice the 1 and 8 pins from the 14 pin connector together with them. The 1 and 8 pins are the rear brake sensor.

So you will end up with the rear sensor signal going to the three sensor inputs. The controller cannot ever see a difference in speed so now it won't work. Bingo.

I should mention that each sensor has a + and - .

You will want to end up with pins 1 and 4 of the 4 pin connected to pin 1 of the 14 pin connector, And pins 2 and 3 of the 4 pin connected to pin 8 of the 14 pin connector.

It looks like it will work, but you are responsible for any modifications you do to your truck , not me!! Test it full when done.



fox

I'll check back this afternoon for comments.

Also, I am looking at the manual for a 2001 truck. Other years may be different.

P. S. I love to fix their design flaws!!!

 

[HC]

Good Job!



I managed to order without anti-lock, but I'm glad to see someone working on this. The only additional thought I have is that I would consider the ideal situation to be a dash-mounted switch that allowed me to disable anti-lock for some situations (like gravel roads), while leaving it engaged for other situations where it seems to work better. With a few connectors and wires, your research could lead to that.

 

[fox]

Yes a user friendly switch is a good idea also. I'll work on that this rainy day!!

We know that there are times when anti-lock is good and times when it will cause expence to us. I wish Ma Mopar was listening.

Ah oh, I got an idea on that switch. Go to go now. I will be back soon!!



fox

 

[csutton7]

very interesting---chris

 

[fox]

Ok, I tried to just un-plug the motor, it is a two wire plug , It set the brake warning light. So I checked the resistance of the motor and it is less than . 1 ohm. So, I tried to just jumper it and still get the light.

I guess the first idea is the best so far, but I'm not done.

fox

 

[fox]

BTTT

For those who didn't see this.

fox

 

[ox1]

Or as simple as pulling one of the fuses out of the box on the left side of dash. Don't remember which one. Yes, the brake (and one of the other) light does come on - on the dash. If you want it back, simply replace the fuse.



OK, I just ran out to look for sure. I don't see any fuses missing, but slot #21 is empty, and a space above the big blue thing in the bottom left corner (99 truck) is empty. So, I must have pulled one of these (2 yrs ago?). Maybe I pulled it down below, but I don't think so.



I had the anti-locks kick in during hard braking with 30' gooseneck on. NOT a pretty sight! As the truck brakes would pulse, the goose was hanging on for dear life! Also, I don't run any brakes on the trailer when empty as all it ends up doing is frying the tires (even on low output).

 

[Chipstien]

Well.........

Has anyone tried this yet. I am curious to see if it works.

 

[illflem]

Fox, which year are you working with? Does the 14 pin connector need to be plugged back in after splicing?



In your experiments I don't know that the light coming on indicates much. After removing my ABS relay and having the light come on then later replacing the relay the light still stayed on. In fact it stayed on even after disconnecting the batteries for a day, it took at least two weeks of starts and stops for the light to go out after the relay was replaced. Don't know how but my ABS system seems to be able to remember a fault code even without power.

 

[fox]

Yes the 14 pin and the 8 pin connectors must be plugged in. I was working with a 2001 3/4 ton.

 

[fox]

Yes the 14 pin and the 8 pin connectors must be plugged in. I was working with a 2001 3/4 ton.

It should work, but I have not tried it yet. I just got my new 2002 and need time to get the other things hooked up. Phone cb radar detector etc.

It will be investigated on my truck as time allows, and I will post the results.



fox