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Old 08-10-2020, 06:59 AM   #1
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1977 24' Argosy 24
SW Florida , Florida
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Question 1977 Master Cylinder Needed

We cannot find a 1977 P30 master cylinder ANYWHERE that has a check valve in it. Auto Zone, RockAuto, etc., nada. This is for a 24' Argosy motorhome. Suggestions, anyone?
Thank you in advance.
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Old 08-10-2020, 09:04 AM   #2
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Worth a call, maybe.


https://www.cardone.com/

Ask for application assistance.
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Old 08-19-2020, 06:55 AM   #3
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1991 25' Airstream 250
Oxford , Oxfordshire
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Quote:
Originally Posted by Elisa View Post
We cannot find a 1977 P30 master cylinder ANYWHERE that has a check valve in it. Auto Zone, RockAuto, etc., nada. This is for a 24' Argosy motorhome. Suggestions, anyone?
Thank you in advance.
Chuck your VIN number into the AC Delco parts site
https://parts-catalog.acdelco.com/ca...log_search.php
Can you cross ref the original casting number on the bottom of your old master cylinder?
Cross ref with Rockauto and Dorman
Ensure you know your brake set up e.g. front disc/rear drum or disc.
Ensure you check that the part is for the Motorhome chassis.

Ensure you check carefully to get the correct fit. Brad or Martin can probably advise further. Example (and I am NOT saying it is the correct part) below.
https://www.dormanproducts.com/p-939...braketype=Drum

all the best
Nick

PS casting numbers are always best!
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Old 08-19-2020, 07:01 AM   #4
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1991 25' Airstream 250
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Incidentally, I thought those check or proportioning valves were mounted seperately in front of the Master Cylinder on the chassis rail on the Motorhome chassis. I might be wrong because I am not familiar with the age of your coach or whether it differs between a 350 and 454 set up.


1977 Service manauals
ST330-77 1977 Chevrolet Light Truck Service Manual
ST333-77 1977 Chevrolet Passenger Car and Light Truck Unit Repair Manual
1977 GM CK Light truck Wiring Manual
ST-331-77 1977 Chevrolet 40-60 Medium Duty Truck Service Manual
ST-332-77 1977 Chevrolet 70-90 Heavy Duty Truck Service Manual

http://67-72chevytrucks.com/vboard/s...d.php?t=545416
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Old 08-19-2020, 08:11 AM   #5
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Have you thought of Re-Building the one you have?

http://www.secondchancegarage.com/pu...r-cylinder.cfm

When owning a "Vintage" vehicle sometimes you have get crafty.

-Dennis
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Old 08-19-2020, 08:24 AM   #6
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Check out section 5-18 in the Light Truck Service manual
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