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OT Dodge pickup pulsing brakes

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Richard Fazio

03-29-2003 06:35:05




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I'm at a loss, scratchin' my head. I've got a 98 2500 dodge. Brakes started pulsing in the rear. First I pulled the drums and cut them. I looked at the shoes and they were like new. I put the cut drums right back on. Still pulsed. Then I figured the drums were shot, Got new ones. Still pulsed. Then I figured the shoes must be messed up. Got new shoes, cut the new drums, still pulsed. While I've got the thing jacked up I start it and put her in gear. I put my screw driver in the adjuster slot to try and adjust the brake adjuster. The screw driver is moving in and out, a lot, while resting on the adjuster. Now I'm thinking my hubs are bent? Anyone have any ideas?

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Don LC

04-01-2003 09:32:19




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 Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 06:35:05  
Be sure to always use a tork whench when installing the wheels....that way all bolts are the same.....



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OLD FORD MECHANIC

03-29-2003 16:40:29




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 Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 06:35:05  
TO TROUBLE SHOOT THE REAR BRAKES,DRIVE THE THE TRUCK AND WHILE HOLDING THE EMERGENCY BRAKE LEVER OUT APPLY THE EMERGENCY BRAKE."DO NOT APPLY ALL BRAKES" ONLY THE EMERGENCY BRAKE WHILE HOLDING THE LEVER OUT.IF THE PULSATION IS STILL THERE THE PROBLEM IS REAR DRUMS.IF THE PULSATION DISSAPEARS THE PROBLEM IS FRONT ROTORS.THE FRONT BRAKES DO AROUND 75% OF THE WORK SO THE FRONT USALLY WHERE THE WARPAGE OCCURS.

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Richard Fazio

03-30-2003 16:02:26




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 Re: Re: OT Dodge pickup pulsing brakes in reply to OLD FORD MECHANIC, 03-29-2003 16:40:29  
I did your test and it's definitly the back. How with new drums & new shoes?



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Richard Fazio

03-29-2003 18:17:42




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 Re: Re: OT Dodge pickup pulsing brakes in reply to OLD FORD MECHANIC, 03-29-2003 16:40:29  
Now I like that idea! I'll try it tomorrow. I have a pedal for the emergency. I can hold out the release and press the pedal. I'll let you know what happens. Thanks.



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grease monkey

03-29-2003 15:32:41




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 Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 06:35:05  
would start with the front brakes. Some pulsing in the brakes with ABS is normal. It is the computer doing the pulsing. You shouldn't feel too much on dry pavement. only when any one of the wheels is slipping on wet or gravel. If the pulsing is thought to be excessive, generally speaking pulsing comes from warped rotors. they should show some signs of heat looking like darker brown lines but not be pitted. if so, have them cut. while you are there inspect your pads. some garages like to sell OEM pads which are much harder and contain more metallic material. that is why they squeak and when you have them looked at, they look fine. I have had better luck with economy pads. while they are softer and need to be replaced more often, they run out quieter. I give up the distance vs having to change pads more often. I catch them soon enough during a rotation to save my rotors and extend their life at least 3 fold. also, make sure your lugnuts are torqued to whatever spec is rated for your vehicle and torque them in a star pattern. I usually hand tighten all 5 (or more) then torque in a star pattern. If the very first one is down too tight the rest don't matter. This is especially important with aluminum wheels which I suspect you have. Good luck

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Jet9N

03-29-2003 08:43:19




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 Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 06:35:05  
Have you tried rotating wheels to see if the problem follows the wheel. Some years ago I had
a distorted wheel that tweeked the drum enough to cause pulsating.

JMHO

Jet



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Richard Fazio

03-29-2003 15:34:13




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 Re: Re: OT Dodge pickup pulsing brakes in reply to Jet9N, 03-29-2003 08:43:19  
Tried that too. What I did was take a set of wheels and tires I have on another truck and try them on the Ram. I was sure it was the tires at that point. But no luck.



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kydavid

03-29-2003 07:11:41




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 Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 06:35:05  
Does your '98 have antilock brakes? My '01 does and it sounds like you are getting a brake lock signal making the antilock kick in. Could be a sensor problem.



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Richard Fazio

03-29-2003 07:23:15




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 Re: Re: OT Dodge pickup pulsing brakes in reply to kydavid, 03-29-2003 07:11:41  
It does have antilock brakes. I was just thinking the same thing. I'm wondering could I pull a fuse to kill power the the antilock brakes and see if that stops it? There is a pump from the antilock brakes, it must be powered through a fuse.



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Richard Fazio

03-29-2003 07:53:29




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 Re: Re: Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 07:23:15  
Nope! Pulled the fuse. The ABS light was on. I went driving around and it's still pulsing. I'm starting to think it's in the front. Even thought the rear hops around when braking.



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kjm A.S.E.

03-29-2003 09:19:20




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 Re: Re: Re: Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 07:53:29  
Richard, It is hard to say over the computer but I have seen it more than once where my custmer told me they had a rear brake problem when it was the front roters.



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Richard Fazio

03-29-2003 13:59:33




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 Re: Re: Re: Re: Re: OT Dodge pickup pulsing brakes in reply to kjm A.S.E., 03-29-2003 09:19:20  
I guess the next step is the front roters.



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T_Bone

03-29-2003 17:51:13




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 Re: Re: Re: Re: Re: Re: OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-29-2003 13:59:33  
Hi Richard,

I had a 79 T-Bird that had a wobble to the steering wheel when the the brakes were applied at about 50k miles. I looked for anything and every thing and couldn't find the cause. Two dealers and three alignment shops couldn't tell me the problem.

Several years latter at 120k miles, brake pedal now has a very light pulse, I'm making a right hand turn and a loud POP, enough that the Goodyear tire shop guys thought it was another accident on the corner. So I coasted in.

The front u-joint off the tranny was bad, free one way, bound up on the opposite cross.

After a new u-joint the first light I came too the steering wheel wobble and the pulsing was gone when the brakes were applied.

Hows that for a "common" brake problem :)

T_Bone

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