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  • Gear oil leaking into brake drum

    Well I went and got new tires on my 92 gmc ext cab 4x4 today and when they pulled off the tires they checked the brakes. Apparently there is gear oil leaking into the back brakes. Since I don't have the over 600 dollars they want, my question would be this.

    First, what NEEDS to be done to fix this and Second, what SHOULD be done since it will be taken apart anyway.

    I am pretty mechanically inclined just haven't had to do this type of job yet so I will need to know the name of the parts that I will need as well.

    Thanks

  • #2
    Re: Gear oil leaking into brake drum

    You will need to replace the rear wheel seals and rear brake shoes. Everything will have to be cleaned well before re-assembly. If your axle shaft is worn at the sealing surface you will need an offset seal or a replacement axle shaft. Is it a half ton?
    Jeff

    2005 Silverado - CCSB 5.3L,3.73,Auburn LS,Rear Disc Brakes

    2000 Silverado - RCSB 5.3L,3.42,open,05 Front Brakes,SS lines,Flowmaster

    1970 Jimmy - 350,TH350,NP205,D60(welded),14FF(Detroit) 38" SX's

    Helping people achieve home ownership in the east valley

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    • #3
      Re: Gear oil leaking into brake drum

      yeah, k1500

      Comment


      • #4
        Re: Gear oil leaking into brake drum

        Its an easy job, you'll remove the diff cover, remove the threaded pin retainer and pin, remove the C clips holding the axles in. Remove the brake drums and pull the axles out. The seals will be easy to replace. Inspect the sealing area on the axle and get the standard seals if the axles arent worn or the offset seals if they are worn. Put a very light coating of rtv on the new seal (outside metal edge to seal the metal to metal contact) and install seals by using a socket that fits the seal and drive it in gently and straight with a hammer. Lightly lube the rubber seal lip with oil and reinstall the axle shafts. Then reverse the procedure to finish the job. Make sure you buy a few cans a brake cleaner so you can clean everything up. Good luck!
        Jeff

        2005 Silverado - CCSB 5.3L,3.73,Auburn LS,Rear Disc Brakes

        2000 Silverado - RCSB 5.3L,3.42,open,05 Front Brakes,SS lines,Flowmaster

        1970 Jimmy - 350,TH350,NP205,D60(welded),14FF(Detroit) 38" SX's

        Helping people achieve home ownership in the east valley

        Comment


        • #5
          Re: Gear oil leaking into brake drum

          I need to do this asap. Mine's been leaking for a while now.

          Comment


          • #6
            Re: Gear oil leaking into brake drum

            thank you guys for the help

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            • #7
              Re: Gear oil leaking into brake drum

              Common sense but dont forget gear oil as well. Its easy to forget the common needed items.
              -Justin

              2006 Tahoe Z71/5.3/RC leveling kit/18x9 Pro Comp 7036 w/275-70-18 TOYO MT's
              1978 F150 SCSB 4WD/4.9/NV435/NP205/D44/9" locked/4" lift/33" BFG's

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              • #8
                Re: Gear oil leaking into brake drum

                Thanks so much for the info guys...even the common sense stuff cuz I woulda forgot and had to make another trip for it. Now... will I need any specialized tools for this job? And will it be pretty obvious if the axle is worn?
                Last edited by wickedss; 07-27-2009, 10:29 PM.

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                • #9
                  Re: Gear oil leaking into brake drum

                  Common hand tools are pretty much all you need, seal pullers help a little when it comes to pulling out the old seals. You don't need to pull all the brakes out to change the seals either, I just spray the shoes down and everything else down good with brake cleaner and call it good. Only need to replace the shoes if they are really badly saturated with gear oil. If you do replace the shoes, brake spring pliers make it easier as well. An you would tell if the axle shaft is worn if there is a heavy groove in the sealing surface of the axle shaft, you should be able to see it. Otherwise pretty straight forward, a chilton or haynes manual helps a little with this just for some of the pictures that they would show so you would know what to expect.
                  2004 Silverado NBS ECSB 5.3 Z71

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                  • #10
                    Re: Gear oil leaking into brake drum

                    thanks....I went to autozone and they have 2 Wheel Seals. 9.5" and 8.5"...how do I know which one I need.

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                    • #11
                      Re: Gear oil leaking into brake drum

                      The 8.5 inch ring gear axle will have 10 bolts holding the cover onto the differential. Where the 9.5 inch axle will have 14 bolts. Just count how many bolts that you have and go from there, more than likely, you have the 8.5 10 bolt.
                      2004 Silverado NBS ECSB 5.3 Z71

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                      • #12
                        Re: Gear oil leaking into brake drum

                        they are called repair bearings. the seal is made into bearing
                        housing and you will have to take the race out to.
                        these bearings are wider to. good luck

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                        • #13
                          Re: Gear oil leaking into brake drum

                          Watching this one!

                          Comment


                          • #14
                            Re: Gear oil leaking into brake drum

                            I now have a question about recalls. I found this and I'm wondering if I am eligible. Do I need to be the original owner, is there a time limit to these things, or should I just call the dealer.


                            Number:
                            RECALL92C01

                            Date:
                            08/28/1991


                            9219chevy01

                            IMPORTANT

                            GMC TRUCK RECALL NOTICE

                            CAMPAIGN 92C01


                            PLEASE RETAIN THIS COPY FOR YOUR FILE. YELLOW CAMPAIGN BULLETIN AND OWNER LETTER WILL NOT BE SENT FOR THIS CAMPAIGN.

                            THE FOLLOWING WAS SENT VIA DCS/EMS ON AUGUST 28, 1991 AND/OR SEPTEMBER 3, 1991.


                            NUMBER: 92C01

                            DATE: AUGUST 28, 1991

                            GROUP: 4B - REAR AXLE

                            SUBJECT:
                            REAR AXLE SHAFT INSPECTION AND/OR REPLACEMENT

                            MODELS:
                            1991-92 C AND K 1/2 TON MODELS


                            General Motors has determined that certain 1991-92 C and K model trucks built at Pontiac East and Oshawa Assembly Plants may have been assembled with improperly heat treated axle shafts. Premature bearing wear without loss of axle shaft integrity, and eccentric seal wear may result in possible oil leakage.

                            To correct this condition, the existing axle shafts will be inspected and replaced where necessary.




                            VEHICLES INVOLVED

                            Dealer codes and vehicles involved are listed.

                            SELLING SHIP TO
                            DEALER CODE DEALER CODE VEHICLE IDENTIFICATION
                            (List Sorted in Selling Dealer Code Order)

                            Comment


                            • #15
                              Re: Gear oil leaking into brake drum

                              It can be a PITA to do these sometimes..ive done several and good luck finding the right axel shafts if u need em 3 times at NApa and the wrong one fianlly found em at a junkyard

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