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Jesse, The module will not stop fluid to rear brakes, a bad master cylinder will,leaking lines, air in brake system, faulty metering block if equipped, collapsed flex lines or pinched brake line faulty caliper or brake cylinders,etc. will cause the possible feeling of no rear brakes.
(ABS Module components) the ABS speed sensors and the ABS control module . When the brake is applied, the ABS control modulereads the speed data from the speed sensor and sends the correct pressure to each wheel to prevent any wheel lock up, eg. sliding/skidding Links below have more info. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Sounds like a transfer case problem, this may require a replacement transfer case.Not what you wanted to hear, try making sure the emergency brake is not frozen or the emergency brake cable is not stuck.
There are three fuses involved.
There is a 25 amp fuse before the brake switch located in the fuse box under the hood. Then there are two 15amp fuses after the brake switch in the box inside the cabin. One is for the lower brake lights and the other is for the high mount light and the trailer connector.
You would need to know if the 15amp fuse for the lower lights has power when the brake pedal switch is applied.
Check the electro-hydraulic control unit mounted on the left side frame underneath the cab. Its made up of the brake pressure modulator valve (bpmv) and the electronic brake control module (ebcm). This controls hydraulic pressure to the brake calipers to prevent wheel lock up. Also check the abs sensor mounted on the transfer case.
todays sports utility vehicles are equiped with a proportioning valve. they are usualy located at the rear of the vehicle. this valve regulates the flow of brake fluid to the calipers. most suv`s have a ride control arm on them that is linked to the rear suspension to apply more braking force to the rear wheels in a harsh or sudden stop. if this valve is bad or malfunctioning even body roll can redirect brake fluid to the rear wheels causing them to lock up., hope this info helps
I would try first to separate the two potential problem sources by (in a safe place and on a slippery surface or sand) bringing the car to a stop, then pressing firmly on the brake and then following that with pressure on the gas pedal.
With someone watching the rear wheels, see if they are attempting to turn even though the brakes are applied.
No doubt that the transmission should be disengaging but it sounds to me as if the rear wheels are not braking at all.
I don't know if your car is so equipped but it was fairly common before the era of ABS systems that there was a regulator in the line servicing the rear brakes, some sensitive to the level (loading) of the car, others to the applied pressure and still others with both capabilities.
The purpose of this system was to prevent the lock-up of the rear wheels.
This regulator was passive and self-contained and rarely caused problems at all, but since they can control the pressure applied to the rear brakes, they might be capable of malfunctioning.