66 c60 rear end brake knowledge!?

[mike_66_c60]

just purchased a 1966 c60 292 4speed 2 speed rear end. i beleive its a 2ton rear end. the driver side rear caliper is locked up. i bleed all lines. i took off the rims/tires and stopped there. anyone knows how to take the massive drum rotor off? thank you

[C10 - C90 Bill]

There are no calipers back there. My guess is the Brake Shoes are frozen to the Drum. The Axle needs to be taken out first, but putting it back together can be a challenge. If you are not familiar with it, I would seek some knowledgeable help.

[mike_66_c60]

thank you

[C10 - C90 Bill]

Show us some pictures of your truck when you get a chance.

[mike_66_c60]

[mike_66_c60]

i will send some with the wheels off when i get a chance. i saw some videos of a 1964 c40 guy removed the drum off without taking the axle off. then i saw some videos where you need to take the axle out the middle to take the drum off. well see when i really look at it. i appreciate the help

[C10 - C90 Bill]

Nice truck.

Real nice condition.

Clean Interior.

But what you have there is not a C-60.

You have an L-60 (LCF) (Low Cab Forward)

[Steeveedee]

It is possible to remove the drum without pulling the axle. There are a couple of slotted flat head screws that hold the drum to the hub. If the drum doesn't turn free, try backing off the adjusters. It could also be rusted to the hub, making it difficult for the drum to slide. That's a cool truck!

[mike_66_c60]

thanks to both. when i put it in gear it will start hoping, then it moves freely but you can tell the pads are pressed against the drum, like i said i will take pictures with the wheel off to get both of yours/anyones opinion. im a paramedic/firefighter and have been working overtime. i plan on posting pics sunday.

[C10 - C90 Bill]

Originally Posted by Steeveedee

It is possible to remove the drum without pulling the axle. There are a couple of slotted flat head screws that hold the drum to the hub.

My mistake. I always thought 2-Tons were like 1-Tons. I had to pull my 1-Ton Rear Drums more than once.

Luckily? I never had to pull Drums on my 2-Tons.

[VictoriaHardware]

The regular Service Manual has info for not just the 10 series but 20, 30, 60, & 80. That's a good reference for exploded diagrams and procedures. For this you'll need the '63 Manual plus the '66 Supplement.

[mike_66_c60]

thank you i saw some for sale on ebay

[mike_66_c60]

update. you do need to take the axle out of the middle and there are 2 lock nuts. i sprayed wd-40 from the back and let it sit over night. hit the drum with the a big hammer and after i took the lock nuts out of the axle it freed from the pads. i cleaned everything and found out the bottom wheel cylinder is leaking. i pulled the boot back and sprayed brake cleaner and still leaking. anyone know what the proper wheel cylinder i need to order?

[Robert1970C20rstbukt]

You might want to replace both cylinders while you've got it all torn down, speaking from experience lol. Looks like a Dorman W24489 might be the one, shows it fits upper and lower positions with 15x6" brakes, has a 1.625" bore.

https://www.rockauto.com/en/partsearch/?partnum=w24489

[VictoriaHardware]

Per GM Medium Duty parts book, looks like original GM p/n was 3772241, also Wagner p/n FD 24489. So that Dorman p/n is probably right. Supposed to be 1 5/8" bore.

[c60clf]

have you found your wheel cylinders, if not reply and i will dig through my old parts boxes and notes, cool truck, cant wait to get mine running.

[Airdirect]

Wow, very nice truck. Looks like an incredible survivor! Most of these models get butchered, nice to see an original. I have found that Rock Auto has a good selection of brake parts for medium duty trucks like ours.

[mike_66_c60]

thanks guys. I ended up getting the wheel cylinders rebuilt. It was a pain trying to find the same size wheel cylinder. i put everything back together and the pads are rubbing alittle against the rotors. i think i might have moved the adjusters while putting it back together. but im not taking it back off, going to let the pads wear off a little themselves. i havent worked on something that big before. i keep bleeding the brake lines to get all the air out. thank you again guys.