Home » Public Forums » GMCnet » [GMCnet] Disc brake project still in failure mode
| Re: [GMCnet] Disc brake project still in failure mode [message #282491 is a reply to message #282486] |
Sun, 19 July 2015 15:39   |
James Hupy
Messages: 6806
Registered: May 2010
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Senior Member |
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Neil, a step bore would be two different sized bores. In a closed ended
cylinder, the bore that was deepest would be a smaller diameter than the
end closest to the booster. The pistons in the bores would match their
bores. The results would be a different displacement volume of fluid from
each bore. They are rarely seen, but are possible. If that were the case
with yours, it could account for the variation in pressure as well. This
stuff makes my head hurt. It is nearing 100° in my shop. Is it 5:00 yet?
Jim Hupy
On Jul 19, 2015 1:28 PM, "Neil Fonville" wrote:
> Yes I did swap the lines. Front line on the old moved to Back on new MC.
> And vice versa.
>
> What is a Step bore in the MC?
>
> On 7/19/15, 2:54 PM, "Gmclist on behalf of James Hupy"
> wrote:
>
>> 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. That is the way I install
>> the
>> P-30. Haven't had any issues just swapping the lines. When I have to
>> replace the lines, as is often the case when you mess with the
>> distribution
>> valve fittings, I use the same size lines. I personally cannot tell the
>> difference either way it is done.
>> If you are seeing different pressures at the distribution valve, you
>> either have a step bore in the P-30 MC or a restriction somewhere
>> downstream from the MC.
>> JIM HUPY
>> Salem, Or
>> 78 GMC ROYALE 403
>> On Jul 19, 2015 12:33 PM, "A." wrote:
>>
>>> Neil Fonville wrote on Sun, 19 July 2015 14:04
>>>> I have the P-30 MC and the back port of the MC is the rear brakes and
>>> is
>>> the larger of the two fluid lines. Do I have that wrong?
>>> Mr. Hupy said the larger goes to the rear. JP Winger's gallery on the
>>> photo site says the larger goes to the front. Since that is conflicting
>>> info,
>>> you need to trace the line yourself. If the line with the larger
>>> connection on the master cylinder goes to the end of the combination
>>> valve
>>> that
>>> splits to the fronts, it is the line to the front.
>>> --
>>> '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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