D2Denny Posted December 28, 2021 Share Posted December 28, 2021 The hand / park brake was inoperative on this unit, so I dropped the driveline, removed the drum and shoes with the linings worn and loose from the shoes. I sent them out for relining and when they came back it seemed that the linings that were installed were thinner ( actual lining 9/32" thick). I installed them and couldn't get them to adjust up and grab the drum. In the slack position I can fit a 9/32" drill bit between the linings and the drum. Does any one have a part number or specs on the Bendix park brake shoes? I'm thinking they should have at least 1/2" lining thickness when new. Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/ Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 i have the setup on my DM sorry i dont know what thickness thier supposed to be... cant you take them back and tell the guy thier too thin?????? Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486076 Share on other sites More sharing options...
D2Denny Posted December 29, 2021 Author Share Posted December 29, 2021 I will send it back. You have to realize that most places haven't dealt with this type of equipment in 40 or 50 years and all the people that did this are long gone along with the part catalogs of the era. I'm trying to give them guidance on exactly what I need. I couldn't think of a better place to seek this info than this web site. Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486110 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 I’ll run out now with a flashlight see if I can see them Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486114 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 Alotta times the shoe will fit other applications brake redline outfit I’m sure they will have your size Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486115 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 OK mine are slightly Over quarter inch material and it looks like 5/16 or so between drum and shoe both sides I was able to see you in there good luck…. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486117 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 Our a little over 3/8 both sides another words the shoes are nowhere near the drum on mine Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486118 Share on other sites More sharing options...
D2Denny Posted December 29, 2021 Author Share Posted December 29, 2021 does your park brake work properly when applied? Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486138 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 i dont know the transmission is out of it right now i just tryed pulling on the linkage but everything is frozen here right now.lol.sorry Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486139 Share on other sites More sharing options...
D2Denny Posted December 29, 2021 Author Share Posted December 29, 2021 Thanks for going out and checking for me. My Mack owner's manual has instructions to adjust the Bendix internal shoe in the un-applied state, shoe to drum clearance to .010. Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486143 Share on other sites More sharing options...
mowerman Posted December 29, 2021 Share Posted December 29, 2021 wow thats not a whole lotta space...bob Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486145 Share on other sites More sharing options...
mrsmackpaul Posted December 29, 2021 Share Posted December 29, 2021 Are you sure that it is assembled correctly, I have never seen a drum brake were even if the lining is missing the steel part of the shoe still reaches out and grabs the drum fine Actually that isnt correct, I have seen miss matched drums, shoes, s cams and rollers on s cams that under heavy brake application can go past the high point on the s cam It sounds like it isnt put back together correctly, or maybe it never was put together correctly when you got the truck, I have no idea on the history of this so cant offer any more advice than that Maybe check part numbers if you have access to a parts book and confirm all parts are correct Paul Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486149 Share on other sites More sharing options...
mowerman Posted December 30, 2021 Share Posted December 30, 2021 Well those linings look about as thick as mine Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486214 Share on other sites More sharing options...
MACKS Posted December 30, 2021 Share Posted December 30, 2021 I would say there should be one of these wheel adjusters,is there a slot on the face of the drum where you would insert a brake adjuster tool,that how it was on my 70 DM 800? Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486215 Share on other sites More sharing options...
mowerman Posted December 30, 2021 Share Posted December 30, 2021 (edited) Yeah mine is the same way except there’s another adjustment opposite the star a stud sticking through the backing plate with a lock nut on it I don’t know what that does Edited December 30, 2021 by mowerman misspell Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486218 Share on other sites More sharing options...
D2Denny Posted December 31, 2021 Author Share Posted December 31, 2021 Yes, there are 2 open slots in the face of the drum. Somehow I have to figure out what's missing and find one. That should solve my problem. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486227 Share on other sites More sharing options...
mowerman Posted December 31, 2021 Share Posted December 31, 2021 Well it looks like you might be just missing the star Juster you can buy one anywhere they’re just standard size any older vehicle application AutoZone will probably have one just walk right in and buy it 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486228 Share on other sites More sharing options...
h67st Posted January 2, 2022 Share Posted January 2, 2022 I found these linings on ebay, it says they fit B models so I don't know if the G used the same. It says they are 1/4" thick. NOS Set Mack Emergency Brake Shoes for 1960-1970 H61T, B60ST, B60T & Some L Series. #221-SJ-20A or GG2033D. 5x1/4" for 12" Drum!! Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486361 Share on other sites More sharing options...
mowerman Posted January 7, 2022 Share Posted January 7, 2022 right on man i didnt think you would have any trouble ,,,but i was wondering why is the truck in the air with the wheels off???????.bob Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486659 Share on other sites More sharing options...
D2Denny Posted January 8, 2022 Author Share Posted January 8, 2022 What!! I didn't have to pull my steer tires and springs to gain access to the driveline mounted park brake? Wish I would have Kown that before starting. Could have saved myself 20 minutes labor. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486696 Share on other sites More sharing options...
mowerman Posted January 8, 2022 Share Posted January 8, 2022 Aaaaaaaaaaaaaaaaaaaaahhhhh sounds like one of my smart ass reply’s …. Was just curious what else are you doing to it besides springs… Bob Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486699 Share on other sites More sharing options...
D2Denny Posted January 9, 2022 Author Share Posted January 9, 2022 Bob, you are very perceptive, I apologize for my snarky remark. Everyone likes a little ass but no one likes a smart ass. As for the G with the rad out for re-core I replaced the water pump and all the belts and hoses. The generator was replaced with a Delco 22SI alternator, Steer springs out for repair, next is returning the truck to electric start and removing the air start system (it came from the factory with electric start). The 40 plus year old 10X22 tires will be changed out to fresh 11R24.5 rubber. Last significant item will be to fabricate stirrup style steps under the doors ala early Freightliner cab-overs or F Macks. This is the hardest truck to get into and out of as it sits that I have ever encountered. Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486737 Share on other sites More sharing options...
mowerman Posted January 9, 2022 Share Posted January 9, 2022 OK so it looks like they’re mainly off to work on it easier wow I didn’t think it really needed anything I thought it was mainly ready to go are used to own a cruise liner years ago and it seems like that was the same way not extremely difficult to get in and out of but it wasn’t easy and I was only back in my 20s then … Bob Quote Link to comment https://www.bigmacktrucks.com/topic/68988-handpark-brake-bendix-internal-expanding-problem-on-g-75/#findComment-486742 Share on other sites More sharing options...
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