P30 Master Cylinder Rear Bailing Ring Problem

T

Tom Katzenberger

Well-known member
Jun 26, 2019
795
287
63
Good afternoon all,

I am have an issue with the rear bailing ring on the P30 Master Cylinder Cover. When I attempt to push the bailing ring rearward to open the cover it
is prevented from going back, due to its striking the vacuum booster.

Has anyone had this issue and if so how did you over come this situation?

Thanks in advance,
Tom K.
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D.
 
Bruce,

Good to know that others have the same issue and I didn't do something wrong. It appears that I may have to adopt your method as well. I appears that
a small funnel and hose need to be kept onboard for top offs.

The six wheel disc brakes appear to be working well as well. I will know when I get the unit back on the ground.

Thank you for the tip.

Take care,
Tom K.
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D.
 
Same here, pop one of the legs out to remove, then pull it back into place with a pair of channel pliers. I use a turkey baster with a piece of clear
tubing stuck in the end to top up the reservoirs.
--
Christo Darsch
GMC Nor'easters
1977 Eleganza II - "The Komet"
3.50 Power Drive, Disc Brakes, Alcoas
Weymouth, MA
 
I agree with the turkey baster as the best method of topping up the reservoir.

Did you read Dave Lenzi's article on combination valves in the GMCMI magazine. The available combination valves are meant for cars and limits the
maximum pressure to the rear brakes. This was not how the OEM combo valve worked.

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
 
I fill my P30 with a laboratory wash bottle. Search the internet, Amazon has rather a lot.
I also use one to top off batteries.
A potential down side is they are somewhat subject to drips from changes in atmospheric pressure. I minimize that by removing the spout and letting it
drain before storage.

Russ
--
Russ & Linda Mehlenbacher
Rochester Hills, Michigan
'76 Eleganza
'74 Sequoia
 
If you have to frequently top off any master cylinder, you have problems
elsewhere that nee attention. Like worn brake pads and/or shoes, bad hoses,
or leaks in the brake system somewhere. That is a closed and sealed system.
Fluid cannot just disappear without a fault someplace. Keep looking. Your
solution is out there.
Jim Hupy
Salem,Oregon

On Sat, Jun 26, 2021, 3:14 AM Russell Mehlenbacher
wrote:

> I fill my P30 with a laboratory wash bottle. Search the internet, Amazon
> has rather a lot.
> I also use one to top off batteries.
> A potential down side is they are somewhat subject to drips from changes
> in atmospheric pressure. I minimize that by removing the spout and letting
> it
> drain before storage.
>
> Russ
> --
> Russ & Linda Mehlenbacher
> Rochester Hills, Michigan
> '76 Eleganza
> '74 Sequoia
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
 
Thank you all for the great responses! Russ I forgot about the Lab Wash bottles.

I do use Harbor Freight bottles with a 180 degree curved tube and the adjustable tip for the brakes on my aircraft. I un-screw the bottle lids because
I learned about the ramifications of atmospheric pressure while cleaning up my aircraft supply cabinet. LOL.

Both the baster and wash bottles are great ideas.

Jim, I hope not to be filling my reservoir and more of checking. After losing my brakes in my old coach, I will forever have a heightened awareness of
brakes and brake system checks.

Thank you guys for all your insight and thoughts.

Take care and have a great weekend,
Tom K.
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D.
 
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