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Old 04-04-2013, 01:18 AM   #1
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1979 Master Cylinder?

I'm having trouble finding the right master cylinder for my 'beast'. 1979 chevy 30, Higgins-Delta, Sunbird chassis.
disc/drum, dual wheels. Engine is a 400 small block 6.6L.
MGVW is 10500 lbs.
There seems to be so many variables out there, it's hard to decipher which one is the right one.
Anyone with any info please let me know your thoughts or links to places to look.
Thx to anyone who has any ideas, my limited income is a concern also as I'm on SS and trying to get ready to head north to NY from GA.

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Old 04-04-2013, 04:56 AM   #2
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Here is a link to Advance Auto. There a two different master cylinders. You will need to know whether the brake code is JB7 or JB8. They also have remanufactured ones for less money.
Buy Cardone Select Brake Master Cylinder - New 13-1534 at Advance Auto Parts
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Old 04-04-2013, 09:19 AM   #3
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If you have Hydroboost power brakes (driven by power steering pump) then it is JB8.
If it is a vacuum power brake booster then it is JB6 or JB7. From what I have read, it looks like the rear dually's were hydroboost systems (JB8).

Look to see if the "Service Parts Identification" sticker is still attached to the door or under the hood which lists the option codes (i.e JB8) is still attached.

All 3 versions used on a Chevy G30 chassis are shown on the Advance site as well as NAPA and Bendix that can be used for comparision.

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Old 04-04-2013, 02:19 PM   #4
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Here at Carquest the JB8 (which I agree with Dave78chief) the part # 20-1641 line code BPR
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Old 04-05-2013, 12:22 AM   #5
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Thanks to all who responded on my Brake cylinder question, I did in fact find the spec label and it is a JB8.

Part Number: 3599-07046028
Notes: Master Cylinder -- New; Cardone Select; Supplied w/ Reservoir; with Hydroboost; with Brake Code JB8; with Forward Control Chassis Cab; GM Brake Codes are on the "Service Parts Identification" sticker.
Condition: New
Now my next question concerning the above, for $21.75 versus, Advance Autos $125.00. Partsgeek has great reviews and shipping is cheap at 8 something.
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Old 04-05-2013, 09:30 PM   #6
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Are you sure you have a P30 chassis? The front end of your Class B in your picture looks like a G30 van chassis. The reason I am saying something is they list a different master cylinder P/N (3319-07115788) for the 1979 G30 JB8. Be sure to compare the picture of the one you buy to your original master cylinder.

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Old 04-06-2013, 12:17 AM   #7
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I didn't specify, just that it's a 30 on the side of it, can't find what letter goes with it, but the concencus seems to be it's a G30 and the brake spec on the label is JB8.
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Old 04-06-2013, 11:42 PM   #8
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AutoZone had my master cylinder for 48.99 bucks, no core charge. Advance auto 125 bucks with core charge. Both new not reman. Advance had to order, AutoZone had in stock. My vote goes to AutoZone!
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Old 04-06-2013, 11:52 PM   #9
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I'd vote it's a G30 as well.
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Old 04-07-2013, 12:08 AM   #10
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Thanks to all for the help with the brake master cylinder questions. Hopefully includeing a pic of old cylinder, no pics of new yet, but looks just like old one except a lot cleaner and shinier. Also including another pic of the 'Beast'.
Hopefully I can be on the road soon, still have to bleed the brakes and think we did a boo boo already, I think we were supposed to 'prime' the cylinder first? Son, is checking out the bleeding instructions for proceeding tomorrow.
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Old 04-07-2013, 07:28 AM   #11
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You have a a 1978 G30 chassis
http://www.73-87chevytrucks.com/tech.../1979truck.pdf

VIN# CGR3380151658
C = Chevrolet
G = Chevy Van (this is were the G in G30 comes from)
R = 400CI V8 4BBL
3 = 1 ton chassis (this is were the 30 in G30 comes from)
3 = cab and chassis
8 = 1978 (Was not uncommon for a Coach Mfg to build this years model on previous years chassis)
0 = Production plant
151658 = Chassis Serial Number

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Old 04-07-2013, 12:49 PM   #12
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New school says bleed the MC first, my old school never did and still don't with no adverse effect except maybe a minute or two longer to bleed the system. The extra time to me is well off set by how much fluid is not lost when reconnecting the brake lines, some lines just take a little longer starting them to be sure you don't cross thread the connections.
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Old 04-08-2013, 01:23 AM   #13
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Quote:
Originally Posted by Dave78Chief View Post
You have a a 1978 G30 chassis
http://www.73-87chevytrucks.com/tech.../1979truck.pdf

VIN# CGR3380151658
C = Chevrolet
G = Chevy Van (this is were the G in G30 comes from)
R = 400CI V8 4BBL
3 = 1 ton chassis (this is were the 30 in G30 comes from)
3 = cab and chassis
8 = 1978 (Was not uncommon for a Coach Mfg to build this years model on previous years chassis)
0 = Production plant
151658 = Chassis Serial Number

Dave
Very interesting, Dave, thank you very much for deciphering the VIN for me! But the motor, etc. would still be a '79, correct, when choosing parts for that?
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Old 04-08-2013, 12:28 PM   #14
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Nope, for all parts purposes, Chevy G30 chassis (engine, suspension, running gear, etc.) is a 78. The house portion (fridge, camper, oven, water heater, etc.) is the only portion that has a 79 date.

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