Denise,
I'm not an expert on Chevy brakes but I came up with this info a while back. The first column doesn't specifically mention JB9 brakes but I pretty sure your 24' Argosy will have the JB9 brake system. Your motorhome will have front disc brakes and rear drum brakes. They should be able to measure your brake shoes and look at the list below to verify if JB9 is correct.
Hopefully this information will get you want you need.
Brad
JB1 BRAKE, MANUAL, DISC/DRUM, 4300 LBS
JB3 BRAKE, POWER, DISC/DRUM, 4600 LBS
JB5 BRAKE, POWER, DISC/DRUM, 6400 LBS
JB6 BRAKE, POWER, DISC, DRUM 7200 LBS
JB7 BRAKE, POWER, DISC, DRUM 8400 L85
JB8 8RAKE, POWER, DISC, DRUM 10000 LBS
Physical examination using the following specifications:
Engine Front Rotor Rr Drum/Rotor Power Booster Production #
Gas 11.86" x 1.28" 11 x 2" None JB1
Gas 11.86" x 1.28" 11 x 2" 9.5" Single Diaphragm JB3
Gas 11.86" x 1.28" 11.15" x 2.75" 9.5" x 8" Dual Diaphragm JB5
Gas 12.5" x 1.28" 11.15" x 2.75" 9.5" x 8" Dual Diaphragm JB6
Gas 12.5" x 1.28" 13" x 2.50" 9.5" x 8" Dual Diaphragm JB7
Gas & Diesel 12.5" x 1.53" 13" x 2.50" Hydro-boost JB8
Gas 14.25" x 1.53" 15" x 4" Hydro-boost JB9
Diesel 11.86" x 1.28" 11" x 2" Hydro-boost JD3
Diesel 11.86" x 1.28" 11.15" x 2.75" Hydro-boost JD5
Diesel 12.5" x 1.28" 11.15" x 2.75" Hydro-boost JD6
Diesel 12.5" x 1.28" 13" x 2.50" Hydro-boost JD7
Gas & Diesel 14.25" x 1.53" 13.75" x 1.53" Hydro-boost JF9 (4 wheel disc)
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Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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