Roll Control, How well should it hold?
#2941239
07/08/21 03:44 PM
07/08/21 03:44 PM
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hp383
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Question on a Hurst Roll Control unit I have installed on my Dakota.
The unit is installed in the front brake line just after the combination valve. Per the instructions this seems like the correct location. (see picture)
When I set the brake, then press the button, and release the brake pedal, the truck will only hold position for about 3 seconds before starting to creep forward at idle.
It absolutely won't hold position if I add any throttle to the equation.
Do I have a bad plunger in the roll control unit, or is something else going on?
A little extra information, the unit was originally installed incorrectly just off the master cylinder, before the combination valve, in the front brake line and did the same thing, with the only difference being it would trigger the BRAKE warning light. So this was corrected, and the combination valve was reset.
The front brakes work just fine and will hold the truck under power if I two foot the pedals. But I really would like to be able to set the roll control, do a burnout, then be able to line up and stage under throttle without rolling away.
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Re: Roll Control, How well should it hold?
[Re: Bennoel 10]
#2941301
07/08/21 05:49 PM
07/08/21 05:49 PM
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hp383
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Just to add a bit more info, the truck is a 92 Dakota. No front ABS, and the rear ABS was deleted years ago.
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Re: Roll Control, How well should it hold?
[Re: roadrunninMark]
#2941427
07/09/21 02:04 AM
07/09/21 02:04 AM
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hp383
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I have tried pumping up the brakes before hitting the button. It doesn't make any difference.
Pedal stays where it is, it doesn't sink to the floor. Two years ago I replaced the master and booster when the booster failed.
I have no leaks, and reservoir is staying full.
The fronts tires are not sliding, they just roll.
It's been a problem I've been chasing since last year. But next week I am getting the front suspension replaced and it will be ready to drive in a spirited and aggressive manner again. Due to the current condition of the upper A arm bushings and ball joints, its only been out for the occasional Sunday drive.
I'm tempted to get a new roll control solenoid and have it swapped in while the front is torn apart. But wanted to see if anyone here might have had a similar problem and have some insight into the problem.
The only thing I can come up with is a fluid must be getting past the plunger while the solenoid is activated.
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Re: Roll Control, How well should it hold?
[Re: hp383]
#2941436
07/09/21 05:39 AM
07/09/21 05:39 AM
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Posts: 20,328 Park Forest, IL
slantzilla
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Did it ever work or is this something new? If it's new and the truck has sat it could have crud on the plunger. If it never worked do you by chance have the IN and OUT ports crossed?
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Re: Roll Control, How well should it hold?
[Re: slantzilla]
#2941464
07/09/21 10:20 AM
07/09/21 10:20 AM
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Posts: 10,931 North Dakota
6PakBee
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If the brakes initially hold and then are apparently releasing, without any fluid leakage to the atmosphere, what else can it be other than the roll control solenoid leaking? I'd put the vehicle on a lift and with a helper setting the roll control, see how much resistance to turning the front wheels have over a period of time. If they initially can't be turned, and then they can be turned with force, and then turned easily, I'd say you are losing your hydraulic pressure and the only way that can happen, if fluid isn't running on the ground, is through a solenoid leak.
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Re: Roll Control, How well should it hold?
[Re: 6PakBee]
#2941477
07/09/21 11:05 AM
07/09/21 11:05 AM
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John Brown
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To find out whether the roll control is leaking or the master cylinder, first the brake pedal needs to be depressed at about half pressure with the roll control button not engaged to see if the pedal creeps to the floor. When pedal is fully depressed, that can cause the rubber piston in the master cylinder to expand gripping the bore more tightly. With about half pressure applied that doesn't happen, making it easier to determine whether the cylinder needs to be rebuilt or replaced. If the master cylinder checks out to be ok, the roll control becomes suspect. Quite likely, it didn't get flushed thoroughly before instillation, or if it did, the internal parts may need replacing. I have seen repair kits listed, so it must be a common problem.
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Re: Roll Control, How well should it hold?
[Re: 6PakBee]
#2941505
07/09/21 12:27 PM
07/09/21 12:27 PM
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hp383
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If the brakes initially hold and then are apparently releasing, without any fluid leakage to the atmosphere, what else can it be other than the roll control solenoid leaking? I'd put the vehicle on a lift and with a helper setting the roll control, see how much resistance to turning the front wheels have over a period of time. If they initially can't be turned, and then they can be turned with force, and then turned easily, I'd say you are losing your hydraulic pressure and the only way that can happen, if fluid isn't running on the ground, is through a solenoid leak. This is what is happening. At first activation the wheels cannot be turned, then a couple seconds later, you can turn them with some drag, then they turn free at about 4-5 seconds,
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Re: Roll Control, How well should it hold?
[Re: hp383]
#2941507
07/09/21 12:31 PM
07/09/21 12:31 PM
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hp383
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Thank you for the help guys, I will try to remember to report back next week after getting the truck back on the road.
I was about 99% sure it was a solenoid leak, but just wanted to be sure I wasn't missing something else in the equation.
I will try the brake test at 1/2 pedal, just to eliminate that possibility.
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