Home » Public Forums » GMCnet » [GMCnet] Master Cylinder
| [GMCnet] Master Cylinder [message #139280] |
Mon, 15 August 2011 12:56  |
paul h cashman
Messages: 176
Registered: May 2005
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Ken H
When I got my ,Disc Brake Kit the first P-30 ,the rear chamber wouldn't
pump fluid ,The second P-30 would not pump from the Front chamber. The third
P-30 worked for a while, until residual pressure ,caused my Brakes to lock
up, due to the Check Valves.
They P-30 was designed for a brake System with all Drum Brakes All three
had Check Valves, located in the bottom of the Reservoir.
I ended up using the OEM Master Cylinder ,I received from MR Bounds when I
bought the Sensitized Brake Booster and it works great.
Paul Cashman
Riverdale GA
#1. IIRC, those photos are dated 2003. So that's at least 9*365 times I've
slept since then.
#2. What check valves? I've never seen a MC with check valves other than
that the pistons cover the reservoir ports as they move forward.
Ken H.
On Mon, Aug 15, 2011 at 11:15 AM, Paul Cashman
<paulcashman@bellsouth.net>wrote:
> Ken H,
> Out of curiosity
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] Master Cylinder [message #139299 is a reply to message #139280] |
Mon, 15 August 2011 14:57  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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That's probably the difference -- the P-30 MC's I've had were for all disc
brakes. I suspect the "check valves" are actually "residual pressure
valves". They're used, for drum brakes, to maintain 10 psi pressure to
overcome the pull-back force of the shoe springs. For disc brakes, they'd
be used, designed to maintain 2 psi, to prevent fluid drain-back if the MC
was below the calipers -- certainly not the case on a P-30.
Ken
On Mon, Aug 15, 2011 at 1:56 PM, Paul Cashman <paulcashman@bellsouth.net>wrote:
> Ken H
> When I got my ,Disc Brake Kit the first P-30 ,the rear chamber wouldn't
> pump fluid ,The second P-30 would not pump from the Front chamber. The
> third
> P-30 worked for a while, until residual pressure ,caused my Brakes to lock
> up, due to the Check Valves.
> They P-30 was designed for a brake System with all Drum Brakes All three
> had Check Valves, located in the bottom of the Reservoir.
> I ended up using the OEM Master Cylinder ,I received from MR Bounds when I
> bought the Sensitized Brake Booster and it works great.
> Paul Cashman
> Riverdale GA
>
>
> #1. IIRC, those photos are dated 2003. So that's at least 9*365 times
> I've
> slept since then.
>
> #2. What check valves? I've never seen a MC with check valves other than
> that the pistons cover the reservoir ports as they move forward.
>
> Ken H.
>
>
> On Mon, Aug 15, 2011 at 11:15 AM, Paul Cashman
> <paulcashman@bellsouth.net>wrote:
>
> > Ken H,
> > Out of curiosity
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Master Cylinder [message #139343 is a reply to message #139280] |
Mon, 15 August 2011 19:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I've been following this for a while. I got a P-30 in the front yard with an SOB box mounted. Not FWD, which may be the difference. It's a '78 P-30 front control chassis, fitted with a 350 C.I.D. and a THM400. It has HydroBoost brakes, discs in front and drums in rear. The calipers >will< stick from moving side - to - side and create grief. As they heat up, one side being in contact with the disc, they will eventually clamp the brake ON on that wheel. This leds me to believe there's a check valve in the system someplace. Warps the disc from heat too. (Ask me how I know)
--johnny
--- On Mon, 8/15/11, Paul Cashman <paulcashman@bellsouth.net> wrote:
From: Paul Cashman <paulcashman@bellsouth.net>
Subject: [GMCnet] Master Cylinder
To: "gmclist" <gmclist@temp.gmcnet.org>
Date: Monday, August 15, 2011, 5:56 PM
Ken H
When I got my ,Disc Brake Kit the first P-30 ,the rear chamber wouldn't
pump fluid ,The second P-30 would not pump from the Front chamber. The third
P-30 worked for a while, until residual pressure ,caused my Brakes to lock
up, due to the Check Valves.
They P-30 was designed for a brake System with all Drum Brakes All three
had Check Valves, located in the bottom of the Reservoir.
I ended up using the OEM Master Cylinder ,I received from MR Bounds when I
bought the Sensitized Brake Booster and it works great.
Paul Cashman
Riverdale GA
#1. IIRC, those photos are dated 2003. So that's at least 9*365 times I've
slept since then.
#2. What check valves? I've never seen a MC with check valves other than
that the pistons cover the reservoir ports as they move forward.
Ken H.
On Mon, Aug 15, 2011 at 11:15 AM, Paul Cashman
<paulcashman@bellsouth.net>wrote:
> Ken H,
> Out of curiosity
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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