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03-22-2009, 11:35 AM
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#1 |
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Registered User
Join Date: Aug 2007
Location: orlando
Posts: 456
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Brake booster
I need to R/R my power brake booster. I looked on the RPO listing in the glove box. it has an RPO of 1J50. That doesn't tell me much. NAPA wants to know what the JB# is. Can anyone tell me where to locate that number?
Thanks......... |
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03-30-2009, 09:03 PM
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#2 |
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Right on the line, baby!
Join Date: Oct 2003
Location: Phila, PA 19130
Posts: 1,486
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Re: Brake booster
I don't know what that number is, but there are only a few booster sizes/shapes.
I recently did mine, told my local supplier (small old-time shop) and they brought out the book. I pointed and said yep, that's the one. No numbers needed.
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03-31-2009, 12:59 AM
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#3 | |
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Registered User
Join Date: Feb 2009
Location: MARYLAND
Posts: 84
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Re: Brake booster
Quote:
I just replaced mine and came across the same issue...I believe the options were JB3 and JB5...pretty sure its just light and heavy duty...I went with light duty and the JB3 and made out fine....I'm sure the better informed will chime in soon |
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03-31-2009, 07:40 AM
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#4 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: Brake booster
The "JB" number isn't on the vehicle. You have to get it from a supplier or from GM. When you talk to them, know your rear shoe sizes, rotor diameter and thickness. I can tell you 3\4 ton codes but nothing else. If yours is a 3\4 and the rear shoes are 2 X13 it's JB5 if they are 2.5 X13 they are JB8. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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03-31-2009, 12:31 PM
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#5 |
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Don't Crush em Restore em
Join Date: Aug 2004
Location: Pinehurst, Texas
Posts: 764
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Re: Brake booster
I had a very similat problem with trying to replace my master cylinder, I finally pulled the casting numbers off the old one, and had an old timer that knew how to use the books and not the computer to help me find the right one. The problem was different sized fittings for the front and rear brake lines.
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TexasJeff 2009 Silver with Linen Interior Cadillac DTS 1990 Red with White Top and Interior Ford Mustang GT convertible 1998 Red with Gray Interior, C3500 Chevy Crew Cab Dually     
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03-31-2009, 05:03 PM
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#6 |
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Registered User
Join Date: Mar 2009
Location: Maine
Posts: 13
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Re: Brake booster
Check around, a brake specialty shop maybe able to rebuild your old one. I also believe its cheaper this way.
The only place I used was in So. California, it was "Bush Power Brake" Ask for Steve. He's in National City (next to San Diego) 619-474-8906 Call him for a price, just to see. |
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04-01-2009, 08:38 AM
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#7 |
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Registered User
Join Date: Mar 2009
Location: TN
Posts: 410
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Re: Brake booster
Man did I ever learn my lesson with the whole JB thing.
Mine is a regular 1/2 ton 2wd C-10, but, it has the Heavy Duty brakes. I didn't even know about until I had to replace a brake hose and the mounting head on it was completely different from what everyone wanted to sell me. I could have sworn the info was on my buildsheet in the glovebox. But, I don't remember seeing the JB numbers there, so I'm pretty sure James is right.
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'69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73 |
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04-01-2009, 12:49 PM
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#8 |
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Registered User
Join Date: Mar 2007
Location: Farmington, MN
Posts: 928
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Re: Brake booster
If I remember right the JB number correlates to the GVW of the truck. The size of the shoes also helps in determining the number. A "real" parts store that has books can be a huge benefit too. The first time I ever went into an Auto Zone I asked the guy if he could look in the book, he told me they don't have any books. I hate Auto Zone. Sorry, off the soap box now.
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I can still count my vehicles on two... wait three hands. Last edited by Damien; 04-01-2009 at 12:50 PM. |
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