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Old 01-15-2018, 02:17 PM   #1
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1979 28' Airstream Excella 28
Austin , Texas
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Excella motorhome rear disc brake conversion / 1979 28 ft. Excella

Has anyone swapped the drums for disc brakes on thier motorhomes?
I see lots of info regarding trailers but not RV's.

Current rig is a 14 bolt chevrolet dually. I believe its a 13 x 3.5 drum.
I havent opened it up & was planning on replacing everything as its @ 38 years old.

I've found a couple of companies that offer kits for the 14 bolt configuration.

any thoughts?
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Old 01-15-2018, 03:16 PM   #2
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1989 34.5' Airstream 345
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Later classic coaches came with disc brakes on the rear drive axle. My 345 has drum brakes on the tag axle. I don't have the details for you but the later discs may be comparable to your rig.

Cheers Richard
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Old 01-15-2018, 10:40 PM   #3
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1982 28' Airstream 280
Port Angeles , Washington
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The P-30 with rear disc uses a Dana HD 70 rear axle. In addition to disc brakes they have 4" axle tubes. To use a HD 70 you also need to add a parking brake to the rear of the transmission.

If you can find a changeover kit for your axle it might be an easier way to go.
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Old 01-16-2018, 01:31 AM   #4
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1975 20' Argosy 20
Chestfield , Kent
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I was advised against doing the conversion on Bella. The mechanic had experience of them on Jeeps but on our motorhome the conversion meant changing also changing to the JB9 brake configuration combination valve (JB9 = disks all around) and although you get better brake performance the distance the disk pads move is further than the distance the drum shoes move resulting in a longer brake pedal. It maybe possible to find a master cylinder with a more appropriate throw/adjust the length of the shaft but there is no standard part number for the application. I know Bella is carrying 3000lb less weight than your Excella, but my experience is the disc/drum combination works well when properly setup.
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Old 01-16-2018, 09:50 AM   #5
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1991 25' Airstream 250
Oxford , Oxfordshire
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If you put your VIN into the comp nine site you can get your RPO codes. I though vans over 26ft had larger wheels and JB9 set up
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Old 01-16-2018, 10:42 AM   #6
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1975 20' Argosy 20
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Quote:
Originally Posted by Boom Sounds View Post
If you put your VIN into the comp nine site you can get your RPO codes. I though vans over 26ft had larger wheels and JB9 set up
Not all, the Argosy and early Excella's were JB8s (my donor 28ft was a 1978 and was still JB8). They had the 19.5" rims and 8 lugs hubs but still were drums.
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Old 01-16-2018, 02:28 PM   #7
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Also some of the older VIN's don't work in the comp nine site, my 82 draws a not available.
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Old 01-17-2018, 09:18 AM   #8
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1979 28' Airstream Excella 28
Austin , Texas
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sticking w/ drums

So I'm going to keep things stock which brings me to my next question.
Does anyone have sources &/ or part #'s for the rear components?
in particular my usual suspects for parts are coming up short on the rear brake hoses.
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Old 01-17-2018, 09:31 AM   #9
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1975 20' Argosy 20
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Have you tried searching for a 1979 Chevy P-30, motorhome chassis with a 454 in Rockauto?

They normally have everything you need....just confirm it is for the JB8 brake configuration.
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Old 01-17-2018, 10:42 AM   #10
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1984 31' Airstream310
Honokaa , Hawaii
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Mill Supply lists some brake hoses without application on pages 20-21 of their "Brakes" section, https://www.millsupply.com/stepvan-p...are-2/?page=20 They have sizes and good pictures of the hoses, but don't say what they fit.
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Old 01-18-2018, 07:16 AM   #11
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1979 28' Airstream Excella 28
Austin , Texas
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I've looked at Rockauto, but thier descriptions are confusing. It looks like most of what they offer are front brake lines. there are some specifically noting "rear" but "center" and none look like what I have in my rig.
Additionally; my hoses have a twisted metal, assuming aluminum b/c no rust, jacket w/ a coil spring overwrap.
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