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  #1  
Old 12-28-2012, 03:25 PM
thebunns thebunns is offline
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Default 2008 Dodge Ram ABS System

Can someone explain what the sensor picks up in the differential & how the signal is used to control brake fluid pressure to keep the rear wheels from locking up?
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Old 12-28-2012, 04:08 PM
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^^^ mine locks up as well, so I'm in for answers. I don't know if this will apply to you but I found this today and have already ordered the brake hose http://dodgeram.info/tsb/1998/05-04-98.htm. i think this is only for 2500 series tho.
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Old 12-28-2012, 04:12 PM
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The antilock brake system (ABS) is an electronically operated, three channel brake control system. The vehicle has Electronic Variable Brake Proportioning (EVBP) designed into the system which eliminates the combination/proportioning valve.
The system is designed to prevent wheel lockup and maintain steering control during braking. Preventing lockup is accomplished by modulating fluid pressure to the wheel brake units.
The hydraulic system is a three channel design. The front wheel brakes are controlled individually and the rear wheel brakes in tandem. The ABS electrical system is separate from other electrical circuits in the vehicle. A specially programmed controller antilock brake unit operates the system components.
ABS system major components include:

  • Antilock Brake Module (ABM)
  • Hydraulic Control Unit (HCU)
  • Wheel Speed Sensors (WSS)
  • ABS Warning Light
OPERATION

Battery voltage is supplied to the ABM. The ABM performs a system initialization procedure at start up. A check of the ABS motor is performed at 15 miles per hour. Initialization consists of a static and dynamic self check of system electrical components.
The static and dynamic checks occurs at ignition start up. During the dynamic check, the ABM briefly cycles solenoids to verify operation. An audible noise may be heard during this self check. This noise should be considered normal. The ABS motor and pump are then checked at a speed of 15 mile per hour.
If an ABS component exhibits a fault during initialization, the ABM illuminates the amber warning light and registers a fault code in the microprocessor memory.
The ABM monitors wheel speed sensor inputs continuously while the vehicle is in motion. However, the ABM will not activate any ABS components as long as sensor inputs indicate normal braking.
During normal braking, the master cylinder, power booster and wheel brake units all function as they would in a vehicle without ABS. The HCU components are not activated.
The antilock ABM activates the system whenever sensor signals indicate periods of wheel slip.
The antilock system prevents lockup during a wheel slip condition by modulating fluid apply pressure to the wheel brake units.
Brake fluid apply pressure is modulated according to wheel speed, degree of slip and rate of deceleration. Sensors at each front wheel convert wheel speed into electrical signals. These signals are transmitted to the ABM for processing and determination of wheel slip and deceleration rate.
The ABS system has three fluid pressure control channels. The front brakes are controlled separately and the rear brakes in tandem. A speed sensor input signal indicating a wheel slip condition activates the ABM antilock program.
There are Two solenoid valves (Isolation and Dump valve) which are used in each antilock control channel. The valves are all located within the HCU valve body and work in pairs to either increase, hold, or decrease apply pressure as needed in the individual control channels.
During an ABS stop the ISO valve is energized which acts to prevent further pressure build-up to the calipers. Then the Dump valve dumps off pressure until the wheel unlocks. This will continue until the wheels quit slipping altogether.
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Old 12-28-2012, 05:43 PM
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Very informative, thank you. Silly noob question but does this or in parts apply to a 1998 Ram 2500, I got disc front and drum rears.Cheers
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Old 12-30-2012, 01:19 PM
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Default 2008 Dodge Ram ABS System

I'm still trying to figure out what system my truck has. When I talk to Ram truck personnel, I'm told that I have a 4 wheel ABS system. I've seen pictures of that system, with four brake lines coming out of a rather large HCU & the control module mounted on top of it. My truck does not have that! It has a small unit with one line coming off the master cylinder going to it & the output going to the rear wheels. The other line coming off the master cylinder goes straight to a block which has outputs going to each front wheel. There are wires going to the front wheels (sensors?). The rear sensor is on the top of the differential. The rear wheels have no wires going to them (no sensors?).
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Old 12-30-2012, 03:29 PM
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The only sensor in the back is the one on the differential.
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