| [GMCnet] Master Cylinder [message #139434] |
Tue, 16 August 2011 09:26  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Senior Member |
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Ken H.
I purchased my Disc Brake Kit from Applied GMC and when the first Master
Cylinder failed ,they gave me the Part number to get a new one locally.
When I applied Brakes ,the residual kept building up, until the Brake Pedal
got hard and could not be pushed in at all and it stopped ,the Motorhome
,without me pushing on the Brake pedal .
Paul Cashman
Riverdale GA
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
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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 #139437 is a reply to message #139434] |
Tue, 16 August 2011 09:51  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Really strange. And you didn't have to replace hoses?
Ken
On Tue, Aug 16, 2011 at 10:26 AM, Paul Cashman
<paulcashman@bellsouth.net> wrote:
> Ken H.
> I purchased my Disc Brake Kit from Applied GMC and when the first Master
> Cylinder failed ,they gave me the Part number to get a new one locally.
> When I applied Brakes ,the residual kept building up, until the Brake Pedal
> got hard and could not be pushed in at all and it stopped ,the Motorhome
> ,without me pushing on the Brake pedal .
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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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