Hello,
I am working on a 2000 Ram 1500 sport 4wd quad cab rear abs. Came to me with a leaking frame brake line and ABS light on. I have replaced all the brake lines with NICU lines, all hoses and Master cylinder also replaced rear wheel cylinders and front calipers. I also replaced the ABS sensor in the rear axle. When I received the vehicle it showed codes 36 no signal from the rear sensor and 72 ROM Checksum. After doing all the work and resetting the DTC's I am now getting the abs and brake light on after about 3 or 4 times applying the brakes. After shutting the truck off and back on again the lights are off again until the brakes are applied 3 or 4 times again. I have scanned the truck and it shows no codes present. Any help would be appreciated.

Thanks,
Steve

 

For me, that was the speed sensor on the rear axle.

 

check that you are getting good fluid flow to the rear brakes (bleed it, should move fluid really well).

 

I bled it using a vacuum bleeder first. Then I rebled it by the manual brake pedal way seemed to push the fluid out decent. do you think this could be the problem?

 

May be the proportioning valve just isn't *quite* in the right spot. Grab a friend, bleed all four corners again. Take it out, find a dirt road, STOMP on the brakes. (make the abs do its thing. lites have to be off for it to play nice.) Re-bleed the brakes. Should be golden. (hopefully)

 

I did notice the line from the front port of the MC to the PV which feeds the rear brakes has a sharp bend that is close to almost a kink looking bend I wonder if this could be the issue

 

Entirely possible. If flow is restricted too much, it will displace the proportioning valve, and turn on the brake lite, which in turn, turns on the ABS lite.

 

I will check it out tomorrow. I will replace it and rebleed. I will try to get a picture of the over bent line too. hopefully, this will fix it.

 

Here is a picture of the bend the picture makes it look less kinked.

 

is that a stock line, or has it been replaced? When bent right, the lines shouldn't do that kind of thing......