Identifying heavy duty vs not heavy duty brakes - The 1947

68Gold/white

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Re: Identifying heavy duty vs not heavy duty brakes

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PDXk5

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Standard drum brakes are 2 inch wide. The heavy duty brakes are 2 3/4 inch wide and can be found on 76 to 87 and 10 bolt rear end K series rigs.

It's a fairly simple swap to do if you have the standard drums and want to change to the later heavy duty version. I recently had my rear end refurbished and upgraded the brakes to the heavy duty version at that time.

The rear brakes on all the pickups till 73 (yes 73 is the first year square body) are all 2" wide, 11" I.D. drums... I believe this started in 1960, not remembering well, I didn't sell much 60-66 stuff.

There WAS a heavy duty option from 67-72 for the front drum brakes.

I never sold the HD shoes, EVER for a pickup,
BUT towards the end of my parts store days (1985-1998) a friend came in for front shoes for his Suburban. IT DID have the heavy duty brakes on it. I've never seen them before or since. I'm guessing the HD brakes were most likely only mostly on Suburbans...

Every time I looked up the front brakes for a 67-70 pickup and asked what size the shoes were, I wondered for a long time IF any pickups came with HD front brakes, seemed like I was wasting my breath asking about shoe size.

There;s folks here that swear that the front drum brakes are adequate for any stopping situation, I STRONGLY disagree. Front disc brakes are SO much better!!! You don't need to go crazy with disc on the back, the factory front disc setup is awesome!!!

The heavy duty rear shoes started in 1974, you could get either the 11X2 shoes. OR the 11-5/32 X 2-3/4 shoes on the rear, depended on how the pickup was ordered. The rear HD drums are also different,
You can change to HD rear drum brakes, BUT, BUT you must also change the backing plate, no other way to do it...

I sold auto parts for 13 years.....the answer(s) is/are....The rear brakes on all the pickups till 73 (yes 73 is the first year square body) are all 2" wide, 11" I.D. drums... I believe this started in 1960, not remembering well, I didn't sell much 60-66 stuff.There WAS a heavy duty option from 67-72 for the front drum brakes.I never sold the HD shoes, EVER for a pickup,BUT towards the end of my parts store days (1985-1998) a friend came in for front shoes for his Suburban. IT DID have the heavy duty brakes on it. I've never seen them before or since. I'm guessing the HD brakes were most likely only mostly on Suburbans...Every time I looked up the front brakes for a 67-70 pickup and asked what size the shoes were, I wondered for a long time IF any pickups came with HD front brakes, seemed like I was wasting my breath asking about shoe size.There;s folks here that swear that the front drum brakes are adequate for any stopping situation, I STRONGLY disagree. Front disc brakes are SO much better!!! You don't need to go crazy with disc on the back, the factory front disc setup is awesome!!!The heavy duty rear shoes started in 1974, you could get either the 11X2 shoes. OR the 11-5/32 X 2-3/4 shoes on the rear, depended on how the pickup was ordered. The rear HD drums are also different,You can change to HD rear drum brakes, BUT, BUT you must also change the backing plate, no other way to do it...

Last edited by 68Gold/white; 11-21-2018 at

02:17 PM

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