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Udate on OT Dodge pickup pulsing brakes

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Richard Fazio

03-30-2003 10:53:26




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I went out and tried The Old Ford Mechanic's idea. When I apply the rear brakes using the emergency brake I get the pulsing. To me that means there's no question it's the back brakes. Another clue to add in, is the fact that it does not do it when cold. The first couple of stops are fine. As the brakes heat up it gets worse. If I brake hard a highway speeds it gets real bad quick and that's when the rear of the truck almost hops off the ground. Another thing, when going slower and feeling the pulses it like there are more than one pulse per wheel rotation. Maybe from the two wheels I'm feeling two sets of pulses.

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OLD FORD MECHANIC

04-05-2003 17:00:17




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
RICHARD, SORRY I HAVEN'T BEEN ABLE TO KEEP UP WITH THE BOARD LATELY. I'VE BEEN WORKING 7/12S FOR THE PAST FEW WEEKS.AFTER READING THE UPDATES TO YOUR PROBLEM MAYBE I CAN HELP A LITTLE MORE.RICHARD PULL THE REAR DRUMS AGAIN AND VERY CAREFULLY INSPECT YOUR WORK ONE MORE TIME.PAY CLOSE ATTENTION TO THE WHEEL CYLINDERS AND TO THE AXLE SEALS.ANY LEAKAGE AT ALL FROM THESE TWO LOCATIONS CAN CAUSE CONTAMINATION ON THE SHOES AND CAUSE EITHER PULSATION OR GRABBING IN THE BRAKES.IT DOES NOT TAKE MUCH BRAKE FLUID OR GEAR LUBRICANT TO CAUSE THESE PROBLEMS.IF YOU SEE ANY SIGNS AT ALL REPLACE THE DEFECTIVE PARTS. ALSO BE ABSOLUTLY SURE YOU HAVE THE THE SHOES INSTALLED IN THE CORRECT POSITIONS. THE SHOE WITH THE SHORTER LINING ALWAYS GOES TO THE FRONT SIDE OF THE AXLE ON EACH SIDE.IF THEY ARE INSTALLED INCORRECTLY THEY "COULD" CAUSE THIS PROBLEM. RICHARD,I HAVE INSTALLED MANY AFTERMARKET DRUMS AND ROTORS OVER THE YEARS AND BELIEVE ME, I DISCOVERED THE HARD WAY TO ALWAYS BEFORE INSTALLING THEM TO PUT THEM ON THE BRAKE LATHE AND CHECK THEM.AND JUST BECAUSE THEY DON'T APPEAR TO LOOK WARPED WHILE TURNING DO NOT BE FOOLED.THE ONLY SUREFIRE WAY TO DO IT IS TO TAKE A COUPLE OF "THOUSANDS" OFF THE SURFACE. THEN LOK AT IT CLOSELY.IF THEY ARE WARPED YOU CAN SEE IT THEN.I OWN MY OWN LATHE SO IT IS EASY TO CHECK MINE. IF YOU DON'T HAVE ONE OR DON'T KNOW HOW TO OPERATE ONE TAKE THE DRUMS TO A REPUTABLE AUTO PARTS STORE THAT HAS ONE.A WORD OF "CAUTION" AVOID THE CHAIN STORES LIKE AUTOZONE OR ADVANCE. THEY SOMETIMES HAVE YOUNG "UNTRAINED" EMPLOYEES DOING THIS JOB. USE AN OLDER ESTABLISHED COMPANY IF POSSIBLE.JUST BECAUSE THE DRUMS ARE NEW DOES'NT MEAN THEY ARE TRUE. I DO THIS ON AFTERMARKET AS WELL AS FACTORY REPLACEMENT DEALER PARTS.ALSO ONE MORE THING,ALWAYS INSTALL INSTALL NEW SPRING KITS AND RETAINER KITS WHEN REPLACEING SHOES. THESE ARE WORKING PARTS JUST LIKE THE SHOES AND RECEIVE A TREMENDOS AMOUNT OF STRESS.RICHARD,YOU ALSO RECHECK YOUR PART NUMBERS ON YOUR DRUMS WITH YOUR SUPPLIER.ONE YEAR OLDER OR ONE YEAR NEWER SOMETIMES MATTERS. BE ABSOLUTLY SURE THEY GAVE YOU THE CORRECT PARTS. GOOD LUCK AND LET ME KNOW HOW IT TURNS OUT.

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Don LC

04-01-2003 08:44:39




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
Sounds like you have hard spots in the drums they warp when they get hot.....( hard spots are shiney places )or they may have been turnd too thin and are now warping when hot.....



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Fred Kobs

03-31-2003 23:18:30




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
Lots of good info here already. Just one thing to add, I encountered similar prob. and found that someone had pried the drums over the shoes w/o backing the brakes off first and bent the backing plates. Had a time figgerin out that one.



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Joe

03-31-2003 19:00:33




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
Hey I got A 99 2500 and it ate me alive its the abs system on mine.



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Slowpoke

03-30-2003 21:55:04




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
You said the drums and shoes have been replaced with no change in pulsing. You also said that the star wheel adjusting tool (aka screw driver) moves in and out when the axle was rotating but no brakes applied. The star wheel is held between the brake shoes. Therefore the shoes are moving in and out even when the brakes are not applied. The shoes are able to move on the backing plate, but usually only in a rotational direction. I would lift the vehicle, remove the drums, run the engine with the tranny in gear and see whats happening to cause the shoes to move. Of course, DO NOT apply the brakes with the drums removed. With the engine off, you could try a dial indicator on the end of the axle to see if it's bent. I think a bent axle could cause the drum to run up against the edge of the shoe and push the shoes in and out as it rotates. But the drum should also make some little noise as it rotates. Well, that's about as far as I can go. You certainly have lots of ideas to try to find the answer. Good luck.

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woodtick

03-30-2003 16:51:23




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
wild shot but are the backing plates solid



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JoeK

03-30-2003 11:04:38




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 Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-30-2003 10:53:26  
Warped drums perhaps?



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wrenchman

03-30-2003 18:08:50




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 Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to JoeK, 03-30-2003 11:04:38  
i'll second the warped drums idea...



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wrenchman

03-30-2003 23:29:44




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 Re: Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to wrenchman, 03-30-2003 18:08:50  
hmmmm,on second thought,after reading your previous posts,i don't think warped drums are the problem...you could have bent axles or warped axle flanges though...did the wheels wobble any when you had em turning before???



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Richard Fazio

03-31-2003 06:02:08




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 Re: Re: Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to wrenchman, 03-30-2003 23:29:44  
I pulled the wheels and drums. I then bolted the drums on backward, with the open side out. Started the truck put it in gear and checked out the drums and inside surface. I did not put a dial indicator on it but it appears to run true. I thought sure I would see it out of wack. The thing though is that when cold it is ok. I think what may be happening is that when it heats up they get out of wack. But the thing that gets me is I changed the drums. Brand new though not from a dealer, they are after market drums. Could they be that bad that they do the same thing as my original ones? It just doesn't make sense.

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wrenchman

04-02-2003 02:21:46




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 Re: Re: Re: Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-31-2003 06:02:08  
if you can unplug the ABS just to test,you might try that if only to eliminate it as cause(you never know)...might also check to see how much slack is in axle bearings...most late model stuff has no inner race in rear axle bearings,the rollers ride directly on axle shaft...if the axle flatspots(kinda common with hi-miles or heavy loads/rough roads)they'll do some wierd stuff...



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T_Bone

03-31-2003 08:35:05




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 Re: Re: Re: Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to Richard Fazio, 03-31-2003 06:02:08  
Hi Richard,

Cover the inside of the drum with purssion blue then reinstall them then "lightly" apply the brake while running but just for a second. That should give you a contact patteren to see where the highs and lows or out of round is hitting on the drum.

Might lead to where to look next.

You do have the shoes installed correct, ie; front shoe on the front?

T_Bone



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Kevin

03-31-2003 16:56:10




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 Re: Re: Re: Re: Re: Re: Udate on OT Dodge pickup pulsing brakes in reply to T_Bone, 03-31-2003 08:35:05  
My first thought is brake shoes on backwards also.



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