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Suspension 2nd Gen Dodge Ram Suspension Problems and Questions


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Old 06-05-2010, 09:46 AM
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Default Brakes viberate at slower (35mph) stops.

Hi all,
I have a 2001 ram offroader. Bought her new, she's got 179,000 on her now. New shocks at 80,000, along with airbags and sway bar out back. New brake lines at 100,000, along with SS flex lines and crossdrilled rotors. Rebuilt trans & transfer case at 135,000. New steering componets at 145,000. New frt shocks at 150,000.
**Problem is, as I stop from about 35mph, the truck seems to viberate, not side to side, but front to back. As if the pressure is not relieving from the rear brakes. Park it on Friday, drive it Monday and the problem is not there until I start braking. Maybe after 4 or 5 stop signs/traffic lights, I can feel the rear brakes start to grab at really slow speeds, 5/10 mph. In gravel, the rear brakes grab.
*To try to solve the issue, I replaced frt rotors and calipers, rear drums and everything inside them. All new brake lines again, except front SS flex lines. Combination valve & master cylinder. I also replaced the rear SS flex line for fear of it acting as a slow bleeding check valve if innerds fell apart. Still the problem persist. This truck has rear antilock brakes controlled by a sensor over the pinion.
I don't feel any vibration in the peddle like a typical ABS buzz.
Q- Could it be the anti lock solinoid module acting as a check valve, not allowing the relief the rear brakes need?Only the rear brake line from master cylinder runs though this ABS unit.
Q- Can I by-pass the ABS to test this?
Q-Could it be suspension, tires out of balance?
Any help would be appreciated, Thanks,
Steve
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Old 06-05-2010, 09:54 AM
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I very seriously doubt it's ABS related unless you're cycling the ABS during the first few stops. Anything that rotates is potentially suspect in a situation like this. Have you pulled the driveshaft and checked the joints for binding or looseness?
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Old 06-05-2010, 11:14 AM
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all joints on front and rear were replaced about 20,000 ago. Frt left and rt uni's were replaced 40,000 ago. I did rotate the assy's both front and rear with Trans in N without any bind felt. I've built many trucks (frame off and lift kits) in my past. Only time I have felt this is when a flex line fails due to the interior rubber failing causing the line to become a slow bleeding check valve.
Slowing down without using brakes, in N or drive has no effect. Only when braking at slower speeds.

Q-Could an O-ring/mech. something within the ABS solenoid assy have swelled or shifted causing it to become a slow bleeding check valve as the fluid returns to the master cylinder once you let off the peddle?

The front brakes are still doing all the braking at that critical point, just seems like the rear brake have residual pressure, as if not completly de-pressurizing. They don't seem to be dragging either.
Q-Other than a idiot light on, I should be able to by-pass the ABS with a temp brake line and see if problem still exist?
This is my plan. Although I need to purchace a vacume bleeder. My wife can't help me no more due to health issue.
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