NOS part no. P6720.
Proportioning Valve
Started by
TerrA LX
, Jun 02 2008 09:19 AM
32 replies to this topic
#26
TerrA LX
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Fulcrum Fixture
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Posted 16 June 2008 - 11:52 PM
#27
fuzzypumper
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Posted 17 June 2008 - 12:27 AM
Truthfully I have never seen any prop valves with "Pxxx" markings so this is unfamiliar to me. Any other markings? Does it look the same as my picture?
Where did you get it from?
Where did you get it from?
#28
TerrA LX
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Posted 17 June 2008 - 12:38 AM
Part no. is on the end of the box. Waz told suites Hx etc drum brakes.
#29
fuzzypumper
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Posted 17 June 2008 - 01:22 AM
Well i cant find that P6720 part number in the online PBR catalogue so I suppose dattoman may have an old catalogue or more info.
Is there any other markings on the prop valve itself?
Short of that you could uscrew that back of it and measure up the large spring.
It should be about 27mm long and 2mm thick windings like the pic below for a 150 crack point.
Is there any other markings on the prop valve itself?
Short of that you could uscrew that back of it and measure up the large spring.
It should be about 27mm long and 2mm thick windings like the pic below for a 150 crack point.
Edited by fuzzypumper, 17 June 2008 - 01:26 AM.
#30
dattoman
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Posted 17 June 2008 - 07:45 PM
Both those items are the same
Single pin switch is P6720 and there was only one type I am aware of
HJ and early HZ and LH and early LX
All with drum rears
Single pin switch is P6720 and there was only one type I am aware of
HJ and early HZ and LH and early LX
All with drum rears
#31
TerrA LX
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Posted 17 June 2008 - 10:11 PM
Thanx guys, i feel much better now
#32
_ss202_
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Posted 23 September 2016 - 03:11 PM
A car with rear drum brakes will have a proportioning valve with a crack pressure in the range of 150 to 250 psi.
As rear discs are not self energizing like drums they need higher pressure settings, typically 500 to 800 psi.
Anyone know where i would find a list of crack pressures for specific models?
I know I'm posting this in a nearly 10 year old thread, but I found this thread in a Google search.
Anyway, anyone wanting to know about crack pressures between models, this should help:
http://holdenpaedia....ortioning_Valve
#33
dattoman
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Posted 23 September 2016 - 08:36 PM
A9X and Commdore are 225 too
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