kauzenkaos
1/2 ton status
i got a 90 k5 that i swapped in a 12 bolt from a 76. the 76 had a chalet camper so i guess thats why the 12 bolt has 13 inch drums in the rear? anyway im tryn to find the right master cylinder or at least a cyl that works.
CK5
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what master cylinder should i use?
- Thread starter kauzenkaos
- Start date
The 12 bolt axle does not use 13" drums. Sounds like you might have a 14SF axle and that was never stock in a blazer so someone swapped it in place of the original in the 76 blazer. Take a pic of the diff cover and also the drum from the side and post the pics and we can tell you what you have.
You can also look at this chart to match it up. http://coloradok5.com/axleguide.shtml
kauzenkaos
1/2 ton status
i know the diff is a 12 bolt i installed 4.56 and a posi about 3 months ago. i also know that when the axles were still under the 76 the master listed did the same thing so i ended up using one for 13 inch drums and 3 inch shoes only because thats what is installed on my 12 bolt. im not sayn ur wrong but there was one previous owner maybe he upgraded. ill admit ive never seen it b4 but this is the only chalet equipped blazer ive ever seen. regardless i need a bigger master that will fit on a 90
kauzenkaos
1/2 ton status
thanks i think i found my victim one off of a 1 ton with 13" drums got my fingers crossed
What's wrong with using the stock master cylinder for the 90 blazer? I swapped a 14ff with 13" brakes into my 89 and the brakes worked perfectly, then i did a rear disc swap and they still work perfectly. 
kauzenkaos
1/2 ton status
No to little rear brakes bled the brakes multiple times checked the proportioning valve for flow adjusted the sh!t out of the rear brakes still no rears. I have descent pedal and didn't realize how bad the rears were until it snowed here.
