| Re: [GMCnet] Gmclist Digest, Vol 145, Issue 29 [message #357691] |
Thu, 13 August 2020 11:53 |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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One reason for the spongy pedal is the P-30 master cylinder. If you still
have the OEM brakes, there is absolutely no necessity for installing it.
Originally, when the rear brakes were replaced with a disc system of some
sort, the thinking was that a larger volume of fluid was necessary. With
larger displacement volume comes a lessening of pressure applied for a
given pedal effort. I have installed many disc upgrades, some with P-30
masters, some stock. The stock ones always have a more solid feel than the
P-30's do. If you find that spongy pedal un-nerving, try going back to a
stock one, and see what you think.
Jim Hupy
Salem,Oregon
On Thu, Aug 13, 2020, 9:41 AM Greg Jankowski via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Thanks for the reply, I tried (yrs ago) the vacuum bleeder on the rear
> wheel cylinders, never being able to purge the air, despite numerous times
> emptying the bleeder. Since then the brake lines were replaced. Gravity
> bleeds over months have improved the pedal firmness but never to the point
> of being road safe.
>
> On Thu, Aug 13, 2020, 10:00 AM wrote:
>
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>> 1. Re: Hibernating for way too long! (Larry Davick)
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>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 13 Aug 2020 08:56:28 -0700
>> From: Larry Davick
>> To: gmclist@list.gmcnet.org
>> Cc: Greg Jankowski
>> Subject: Re: [GMCnet] Hibernating for way too long!
>> Message-ID:
>> Content-Type: text/plain; charset=utf-8
>>
>> Greg,
>>
>> I know many have had great success with the pressure bleeding method on
>> the coach. I?ve had good success on my cars with the Harbor Freight
> vacuum
>> bleeder.
>>
>> https://www.harborfreight.com/brake-fluid-bleeder-92924.html
>>
>> Still others have used gravity to bleed the system. Good luck and keep
>> trying!
>>
>> Larry Davick
>> 1976 Palm Beach
>> Fremont, Ca
>>
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>> ------------------------------
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>> End of Gmclist Digest, Vol 145, Issue 29
>> ****************************************
>>
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