Home » Public Forums » GMCnet » [GMCnet] Disc brake project still in failure mode
| Re: [GMCnet] Disc brake project still in failure mode [message #282489 is a reply to message #282485] |
Sun, 19 July 2015 15:34   |
Neil Fonville
Messages: 68
Registered: May 2014
Karma:
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I¹m going out later today to visually confirm the rear port of the MC is
plumbed to the read port of the combining valve. I¹m fairly certain it is
but I¹m going to double check.
On 7/19/15, 3:28 PM, "Gmclist on behalf of A."
wrote:
> James Hupy wrote on Sun, 19 July 2015 14:54
>> I am saying that IF you still have the original metal brake lines that
>> went to the ORIGINAL MASTER CYLINDER, when you install the P-30 master
>> cylinder, in order to install the lines without adapting anything, the
>> OEM line fittings must be swapped in order for them to screw into the
>> P-30.
>> AS THE ORIGINAL RESERVOIR IN THE FORWARD MOST POSITION IS FOR THE REAR
>> DRUM BRAKES, IF YOU SWITCH THE LINES, THE RESERVOIR THEN BECOMES THE
>> FRONT
>> BRAKES. I didn't say that was right or wrong. ...
> It gets confusing since the P-30 fitting sizes are reversed from OEM.
>
> Everything that I know about pressurized fluid in a system is screaming
> at me that Neil is measuring the output to the front brakes at the master
> cylinder, and the pressure in the line to the rear wheels everywhere else
> he has taken measurements.
>
> I think he still has air, or an obstruction, in the rear part of the
> system. I am leaning towards it being air, but we have to get past the
> problem if
> the differential between the points where he is reading pressure. And I
> think there is still air in one or more of the rear calipers. That is
> assuming
> the master cylinder is ok, and I do, despite so many new parts being from
> China and all that.
>
> But we got to get that difference in pressure figured out before going on
> to finding the bubble(s). Once we find that the low reading exists all the
> way from the master cylinder to the rear calipers, we got a good idea
> there is nothing wrong with the lines, or the combination valve. The
> problem is
> either the master cylinder, or air one or more rear calipers. Once we
> establish which line from the master cylinder goes to the rear, if he has
> a way
> to put a gauge on that port and plug the line out of it, we can pressure
> test the master cylinder.
>
> One step at a time. I found out long ago that most people read the first
> sentence and the rest has to be repeated.
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> Upper Alabama
> On "marriage equality": Once you define the direction that society is
> headed as "forward", you can call it progress.
>
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1975 GMC II
Allen, TX
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