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Travelingfam's avatar
Travelingfam
Explorer
Mar 18, 2015

Please help. 84 fleetwood southwind brakes

We just bought an 84 fleetwood southwind 23' motorhome. The previous owners told us that it was going to need a new master cylinder. My husband has does this before on other vehicles so we thought it would be no big deal. When he got under there it seemed to be leaking where it meets what we are now realizing to be a hydro booster. The booster has a small chip in it so we are thinking that it needs replaced instead. We couldn't find the parts identification sticker and the parts store said that it could be a JB8 or JD7. We still aren't 100% sure which one is ours but we ordered the JB8. Then we started reading up on replacing the part and it seemed way out of our league. I tried to decode our VIN 1GBJP37W4E3340208 per the title which just made me even more unsure. Does anyone know if I got the right part and if this is even going to be a project I can do in the parking lot? I just bought it and haven't even been able to drive it home yet.

I also read in the vehicle that we have air coil something or other that should be kept at 50 psi. Where do I check and fill that system?

Thank you from a family at its wits end
Class A
  • Travelingfam's avatar
    Travelingfam
    Explorer
    Mar 18, 2015
    It is leaking brake fluid so we returned the booster and we are replacing the master cylinder. Thank you to everyone and I will keep you updated.
  • enblethen's avatar
    enblethen
    Nomad
    Mar 18, 2015
    Chassis is a 1984 Chev P37 GVW is 10,001-14000
    You would need to do a VIN number search to get the correct brake option code.
    O" Reilly's shows two completely different style master cylinders.
    O"reillys
    O'Reilly's shows there is two types of brake booster. Most common for heavy GVW is the hydro boost.
    Brake booster
    You maybe able to get better idea by looking at photos.
  • dakdave's avatar
    dakdave
    Explorer
    Mar 18, 2015
    What is it leaking?
    brake fluid or fluid from power steering unit?
    hydro boosts were usually supplied pressure from power steering pump.
    if losing brake fluid you need master cylinder.
    If need hydro unit they are not hard to change ,unhook hoses remove master cylinder rod that actuates hydro unit.when installing check rod length that enters master cylinder.
    To get correct part check casting number,this should help get proper part.
    Check with NAPA or brake parts store.
  • Son_of_Norway's avatar
    Son_of_Norway
    Explorer
    Mar 18, 2015
    What chassis is your RV, a Chevy? For info try contacting Geoffrey Rosenburg at Alretta Truck Parts #508-788-9409. He is an expert at older RV brake systems. What about the repair is giving you worries? It isn't much different than doing one on a passenger car. Not sure what you mean by the air coil. Your RV might have air bags in the front springs. Look at them and see. If you have them the air lines are sometimes routed into the front access area. You should see an air line with a Schrader valve on either side. Good luck with your repairs.

    Miles

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