Rear brake shoe differences ??

[riz]

What's the difference between the 2" wide and 2-3/4" wide rear brake shoes..... does it correlate between the light or the heavy duty front rotors? Do the light duty fronts have the 2" rear shoes and the wider heavy duty fronts have the 2-3/4" rear shoes? Please help me figure this out.

RIZ
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[jgorzitza]

Originally Posted by riz

What's the difference between the 2" wide and 2-3/4" wide rear brake shoes..... does it correlate between the light or the heavy duty front rotors? Do the light duty fronts have the 2" rear shoes and the wider heavy duty fronts have the 2-3/4" rear shoes? Please help me figure this out.

RIZ
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Exactly I believe heavy duty code is JB5. Master cylinder is also different as i discovered when replacing mine.

[Keith Seymore]

Originally Posted by riz

What's the difference between the 2" wide and 2-3/4" wide rear brake shoes..... does it correlate between the light or the heavy duty front rotors? Do the light duty fronts have the 2" rear shoes and the wider heavy duty fronts have the 2-3/4" rear shoes? Please help me figure this out.

RIZ
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What vehicle model and year?

K

[riz]

1981 c10 shortbox with 1" front rotors.
I'm trying to buy the correct centric front rotors.

RIZ
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[riz]

Anybody?

RIZ
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[tucsonjwt]

Off the subject I know, but whatever size shoes you buy I would strongly consider staying away from the Centric brand. I bought Centric shoes for my 2002 Cavalier beater and they quickly lost their arc. Meaning, they quickly distorted and did not conform to the arc of the drums. This causes the car to come to a chattering, intermittent stop. If I slam on the brakes at 35 mph or more and engage the anti lock brakes, then the shoes will stop without skipping for a while. It is very irritating, and I will probably replace them with Delco shoes soon.

[riz]

I'm going with Wilwood pads and calipers all the way around.

RIZ

[Keith Seymore]

Originally Posted by riz

Anybody?

RIZ
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Patience, grasshopper*

This is for '87 but should be the same:



*Not to chide you but if you had included the model year and series in the first post it would have saved you 36 hours in response time - and - I would have been able to reference the '81 chart.

[Keith Seymore]

Originally Posted by riz

What's the difference between the 2" wide and 2-3/4" wide rear brake shoes..... does it correlate between the light or the heavy duty front rotors? Do the light duty fronts have the 2" rear shoes and the wider heavy duty fronts have the 2-3/4" rear shoes? Please help me figure this out.

RIZ
Posted via Mobile Device

So - regarding your original question the answer for you is "yes".

Small rotors with 2" shoes go on JB1 (manual) and JB3 (the smallest power system).

Big rotors and 2-3/4" shoes start at JB5 (the highest production volume system for a 1/2 ton).

There is a "hybrid" version with big rotors and 2" rears for JD5 (hydroboost, with diesel) but you probably don't care about that one - other than to know that such an animal exists.

(C10 shortboxes are my "spec-i-al-ity").

K

[riz]

Thanks Keith....... I figured that was the case but wanted verification.

I've been meaning to update my profile....... how do I add my trucks into all my posts like you have yours saying:

Chevrolet Flint Assembly
1979-1986
GM Full Size Truck Engineering
1986 - Present
Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926
My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524
Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/


RIZ

[Keith Seymore]

That's your "signature"; access that through "User CP" and then "Edit Signature".

K

[riz]

Keith.... when you say "spec-i-al-ity" ... is that from Greg Giraldo ???

[Keith Seymore]

"Wallace and Grommit"



K

[riz]

sounded like something Greg said in one of his comedy routines....... " Death by Chocolate. "

[SunSoaked]

Keith-

Any chance you can post those specs for the K20/30 models for 85 year?

I'm currently preparing to swap in some 1-ton axles from a cucv into my 85 K20 in addition to swapping from auto to manual and vacuum to hydro-boost.

The rear is a 14ff with 13 inch brakes, the front is a dana 60. That document would sure help me out in identifying the M/C, pedal ratio, brake size, etc.

I really appreciate it if your able too!

Mike

[Keith Seymore]

Let me know if you have trouble reading these or if you want to drill down in a certain area.

K

[Desert1957]

Hi Keith,
Any chance you can scan this brake info int a PDF file? Might be easier to read, or we can make it a "Sticky"

Thanks for everything you do....

[Keith Seymore]

I can try; I have all the charts from 1969 through about 2001(?).

They are a hodgepodge of different sizes and shapes. My thinking is to just scan those that have a specific demand, rather than trying to do the whole book, which would be very labor intensive.

The information is "borrowed". My other thought is to ask the "owner" to donate it to the Heritage Center and have them scan it but then I would not have such direct access.

I do have a thread started if you would like to make that a sticky and we can add to it as there is demand.

http://67-72chevytrucks.com/vboard/s...d.php?t=510519

They are also a bit more readable when added as a photobucket image in the thread, rather than an attachment, but photobucket was acting up this morning and I did not want to take the time right now to upload the images.

K