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09-05-2004, 04:07 PM
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#1 |
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Registered User
Join Date: Sep 2004
Location: Illinois
Posts: 5
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Brake system question
I need to get a new master cylinder. How do I tell what kind of brake system I have? The factory sticker that was supposed to be in the glove box is gone. Anybody have any idea? Autozone has three options:
#1 - JD3, JD5, JD6 #2 - JB3, JB5, JB6 #3 - JB7, JD7 What is the difference? I have an 82 K-2500 with 1-ton axles, any suggestions? Thanks.  Luke
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 82 K-2500, 8" Lift, 1-ton running gear, still deciding on the tires 
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09-05-2004, 04:30 PM
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#2 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Did you check the driverside wheel well / inner fender area under the hood? Im not sure what rpo it would be for 3/4 4x4. The JD5 is the heavy duty brake system for a 1/2 ton.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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09-05-2004, 04:40 PM
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#3 |
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Registered User
Join Date: Sep 2004
Location: Illinois
Posts: 5
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There is no other info under the hood. Thanks for your input.
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82 K-2500, 8" Lift, 1-ton running gear, still deciding on the tires
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09-05-2004, 07:21 PM
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#4 |
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You get what you pay for
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Maybe you can take the old master with you and match it, if you can get the dummies at Nozone to pull them for you. Other than this, I don't know how you can tell.
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Mike 1985 Chevy C-10 |
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09-05-2004, 09:56 PM
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#5 |
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Registered User
Join Date: Sep 2004
Location: Illinois
Posts: 5
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Yeah, I guess I'll do that, if I find the old one. Tore everything down a while ago. Thanks
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82 K-2500, 8" Lift, 1-ton running gear, still deciding on the tires
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09-06-2004, 06:29 PM
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#6 |
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Registered User
Join Date: Sep 2004
Location: Illinois
Posts: 5
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Spongy brakes
Ok, got my new master cylinder. Everything looks good, bled the brakes 3 times, no bubbles at all, but the brake pedal is still spongy and the truck does not stop good at all. I'm using a 1/2 ton 2wd brake booster in my 3/4 ton 4wd truck. Maybe that is my problem?? Any suggestions?? Thanks
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82 K-2500, 8" Lift, 1-ton running gear, still deciding on the tires
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09-06-2004, 06:55 PM
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#7 |
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You get what you pay for
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Did you bench bleed the master cylinder?
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09-06-2004, 07:15 PM
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#8 |
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Registered User
Join Date: Sep 2004
Location: Illinois
Posts: 5
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Yes I did.
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82 K-2500, 8" Lift, 1-ton running gear, still deciding on the tires
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