| [GMCnet] line lock [message #121871] |
Thu, 14 April 2011 22:42  |
paul h cashman
Messages: 176
Registered: May 2005
Karma:
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Senior Member |
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Hi All
I really wanted to attend the Paterson Rally ,I could just taste those
Crawfish,but it just wasn't meant to be.
My Motorhome has been dead in the Water since the new Disc brakes locked up,
I have found the cause.
When you apply Brakes with the OEM M/S the excess Fluid is returned to the
Resivour.
When you apply brakes to the P30 M/S with Drum Brakes ,the check Valves keep
all the Fluid from going to the Resivour and creating residual
pressure.which is good.
When you apply Brakes to the P30 M/S with Disc Brakes so little Fluid is
used you do not have any residual pressure.
When you apply pressure to a P30 with Disc Brakes and want to apply the
line Block ,you pump the pedal to get maximum pressure to the back brakes
,the resivour has to add more fluid ,because the Piston is demanding more
fluid and the new fluid is locked behind the check Valves,when you release
the line block there is a rush of fluid ,the pressure builds up and cant be
released because of the extra fluid and check valves .
Now you have a hard pedal ,and pressure on your Brake Calipers ,and your
Motorhome has locked up Brakes. like mine.
I now use the Old OEM M/C that I have shortened the Piston Rod length by .25
inch to give it more Volume and it works great ,better than the P30
the OEM has a 1.25 Bore just like the P30
If you have Disc Brakes and a P30 M/S and a line Block this problem will
occur.
Paul Cashman
Riverdale Ga
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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