| [GMCnet] brake pedal play amount excessive [message #143586] |
Fri, 16 September 2011 15:08  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Senior Member |
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Jim.
Armand said earlier that he had an inch and a half play in the Brake Pedal .
It' shard to believe the Rod could expand over an inch and a half at normal
Temperatures.
Armand,
I bought, my Brake kit, from Applied GMC the first of this Year
Armand, your MC pushrod is too long. If you have the adjustable one, shorten
it a turn. Be certain when no pressure is on the pedal that the MC piston is
against the retaining ring. This condition keeps the "bleed back" orfices in
the resevoirs closed and that is what causes the hard pedal.
Jim Hupy
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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] brake pedal play amount excessive [message #143589 is a reply to message #143586] |
Fri, 16 September 2011 15:27  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Paul, The free pedal on the interior of the coach sometimes is a product of
worn parts in the interior of the coach. I concur that 1 and 1/2 inches
should be sufficient, perhaps excessive. The short operating rod from the
forward side of the booster to the MC is where I was speaking about. Because
of the differences in boosters, rods, MCs linkages, that end play clearance
is quite critical, and frequently all over the map on many of the coaches
that I have worked on. All it takes to check is to take off the MC mounting
nuts, pull the MC forward without disconnecting the brake lines, place
modeling clay in the end of the MC and reassemble. Disassemble after placing
the clay and carefully check to see how much clay is left uncompressed or
displaced. If there is the amount that the MM says, then adjustment is not
the problem. I suspect that it is too little. One of our GMC Cascaders had a
similar problem when the brakes were hot. The MC would not release pressure
until it cooled off. After subsequent shortening of the rod, no further
problems occurred in this area.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Fri, Sep 16, 2011 at 1:08 PM, Paul Cashman <paulcashman@bellsouth.net>wrote:
> Jim.
> Armand said earlier that he had an inch and a half play in the Brake Pedal
> .
> It' shard to believe the Rod could expand over an inch and a half at normal
> Temperatures.
>
> Armand,
> I bought, my Brake kit, from Applied GMC the first of this Year
>
> Armand, your MC pushrod is too long. If you have the adjustable one,
> shorten
> it a turn. Be certain when no pressure is on the pedal that the MC piston
> is
> against the retaining ring. This condition keeps the "bleed back" orfices
> in
> the resevoirs closed and that is what causes the hard pedal.
> Jim Hupy
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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