Home » Public Forums » GMCnet » Which Brake Master Cylinder Replacement
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217672 is a reply to message #217668] |
Sat, 10 August 2013 14:08   |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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There are a lot of them available.
Autozone M1730 rebuilt, NM1521 new.
The GMCMI parts book also lists many others : Carquest, EIS, NAPA, Raybestos, Wagner, etc.
If you need more info let me know.
Emery Stora
On Aug 10, 2013, at 12:40 PM, jeff sugheir wrote:
>
>
> I think the MC is going, and just confused myself reading all the related threads here. Assuming my set up is stock 1973, except that the front brakes were upgraded discs with the 1 ton front end, then what I need is a 1.125" bore MC replacement, right?
>
> That is Oreilly's NMC1732 (or the rebuilt 10-1732 for $16) I think, or 1534 for the 1.25" as an alternative.
>
> http://www.oreillyauto.com/site/c/search.oap?keyword=brake+master+cylinder&year=1976&make=Chevrolet&model=C20+Pickup+RWD&vi=1032039
>
> Thanks for any guidance, I need to do this this afternoon.
>
> Jeff
> --
> 1973/94 GMCII in Boise 76 455 with headers & Patterson distributor,1 ton front, 4 bags back, Precision Steering Gearbox
>
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217674 is a reply to message #217672] |
Sat, 10 August 2013 14:16 |
Jerry Wheeler
Messages: 246
Registered: January 2013
Karma: 2
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Senior Member |
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I do not see a replacement number in the GMCMI parts book for the P30
master cylinder. Anyone know what numbers they might be?? My pedal goes
down slowly after the brakes have been applied; has been doing that for
years; in fact, since I installed it brand new in 2000. Still able to stop
the coach however.
JR Wheeler 78 Royale with the Harrison rear disk brake system
On Sat, Aug 10, 2013 at 3:08 PM, Emery Stora <emerystora@mac.com> wrote:
> There are a lot of them available.
>
> Autozone M1730 rebuilt, NM1521 new.
> The GMCMI parts book also lists many others : Carquest, EIS, NAPA,
> Raybestos, Wagner, etc.
>
> If you need more info let me know.
>
> Emery Stora
>
> On Aug 10, 2013, at 12:40 PM, jeff sugheir wrote:
>
> >
> >
> > I think the MC is going, and just confused myself reading all the
> related threads here. Assuming my set up is stock 1973, except that the
> front brakes were upgraded discs with the 1 ton front end, then what I need
> is a 1.125" bore MC replacement, right?
> >
> > That is Oreilly's NMC1732 (or the rebuilt 10-1732 for $16) I think, or
> 1534 for the 1.25" as an alternative.
> >
> >
> http://www.oreillyauto.com/site/c/search.oap?keyword=brake+master+cylinder&year=1976&make=Chevrolet&model=C20+Pickup+RWD&vi=1032039
> >
> > Thanks for any guidance, I need to do this this afternoon.
> >
> > Jeff
> > --
> > 1973/94 GMCII in Boise 76 455 with headers & Patterson distributor,1 ton
> front, 4 bags back, Precision Steering Gearbox
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217684 is a reply to message #217674] |
Sat, 10 August 2013 15:49 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Jerry
Forgot to say this also crosses to Wagner F103239, Bendix 11641, EIS E150063 and a CarQuest 20-2234. This is a 34 mm piston bore (approx. 1-21/64").
This fits a 1977-96 P35/P3500 Van (with 4 wheel disk brakes) and a P-30 Van. It also fits a 1991 C3500 Pickup. It will give sufficient volume for the use of 80mm front calipers added to the front wheels of the GMC and for 4 calipers added to the rear wheels.
This master cylinder has a 1/2x20 threaded port for the front chamber and a 9/16x18 threaded port for the back chamber.
NOTE: the original GMC master cylinder had the 1/2 in the back and the 9/16 in the front. So it is necessary to move the 9/16" (rear brake line) to the rear chamber and the 1/2" (front brake line) to the front chamber. This is not a problem as this master cylinder has two chambers that are of equal size - unlike the original one that has a smaller front chamber that went to the rear brakes.
Emery
On Aug 10, 2013, at 1:16 PM, Jerry Wheeler wrote:
> I do not see a replacement number in the GMCMI parts book for the P30
> master cylinder. Anyone know what numbers they might be?? My pedal goes
> down slowly after the brakes have been applied; has been doing that for
> years; in fact, since I installed it brand new in 2000. Still able to stop
> the coach however.
> JR Wheeler 78 Royale with the Harrison rear disk brake system
>
>
> On Sat, Aug 10, 2013 at 3:08 PM, Emery Stora <emerystora@mac.com> wrote:
>
>> There are a lot of them available.
>>
>> Autozone M1730 rebuilt, NM1521 new.
>> The GMCMI parts book also lists many others : Carquest, EIS, NAPA,
>> Raybestos, Wagner, etc.
>>
>> If you need more info let me know.
>>
>> Emery Stora
>>
>> On Aug 10, 2013, at 12:40 PM, jeff sugheir wrote:
>>
>>>
>>>
>>> I think the MC is going, and just confused myself reading all the
>> related threads here. Assuming my set up is stock 1973, except that the
>> front brakes were upgraded discs with the 1 ton front end, then what I need
>> is a 1.125" bore MC replacement, right?
>>>
>>> That is Oreilly's NMC1732 (or the rebuilt 10-1732 for $16) I think, or
>> 1534 for the 1.25" as an alternative.
>>>
>>>
>> http://www.oreillyauto.com/site/c/search.oap?keyword=brake+master+cylinder&year=1976&make=Chevrolet&model=C20+Pickup+RWD&vi=1032039
>>>
>>> Thanks for any guidance, I need to do this this afternoon.
>>>
>>> Jeff
>>> --
>>> 1973/94 GMCII in Boise 76 455 with headers & Patterson distributor,1 ton
>> front, 4 bags back, Precision Steering Gearbox
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217686 is a reply to message #217684] |
Sat, 10 August 2013 15:58 |
Jerry Wheeler
Messages: 246
Registered: January 2013
Karma: 2
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Senior Member |
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Emery,
Thanks for the numbers; just what I needed.
Jerry
On Sat, Aug 10, 2013 at 4:49 PM, Emery Stora <emerystora@mac.com> wrote:
> Jerry
> Forgot to say this also crosses to Wagner F103239, Bendix 11641, EIS
> E150063 and a CarQuest 20-2234. This is a 34 mm piston bore (approx.
> 1-21/64").
>
> This fits a 1977-96 P35/P3500 Van (with 4 wheel disk brakes) and a P-30
> Van. It also fits a 1991 C3500 Pickup. It will give sufficient volume for
> the use of 80mm front calipers added to the front wheels of the GMC and for
> 4 calipers added to the rear wheels.
> This master cylinder has a 1/2x20 threaded port for the front chamber and
> a 9/16x18 threaded port for the back chamber.
>
> NOTE: the original GMC master cylinder had the 1/2 in the back and the
> 9/16 in the front. So it is necessary to move the 9/16" (rear brake line)
> to the rear chamber and the 1/2" (front brake line) to the front chamber.
> This is not a problem as this master cylinder has two chambers that are of
> equal size - unlike the original one that has a smaller front chamber that
> went to the rear brakes.
>
> Emery
>
> On Aug 10, 2013, at 1:16 PM, Jerry Wheeler wrote:
>
> > I do not see a replacement number in the GMCMI parts book for the P30
> > master cylinder. Anyone know what numbers they might be?? My pedal goes
> > down slowly after the brakes have been applied; has been doing that for
> > years; in fact, since I installed it brand new in 2000. Still able to
> stop
> > the coach however.
> > JR Wheeler 78 Royale with the Harrison rear disk brake system
> >
> >
> > On Sat, Aug 10, 2013 at 3:08 PM, Emery Stora <emerystora@mac.com> wrote:
> >
> >> There are a lot of them available.
> >>
> >> Autozone M1730 rebuilt, NM1521 new.
> >> The GMCMI parts book also lists many others : Carquest, EIS, NAPA,
> >> Raybestos, Wagner, etc.
> >>
> >> If you need more info let me know.
> >>
> >> Emery Stora
> >>
> >> On Aug 10, 2013, at 12:40 PM, jeff sugheir wrote:
> >>
> >>>
> >>>
> >>> I think the MC is going, and just confused myself reading all the
> >> related threads here. Assuming my set up is stock 1973, except that the
> >> front brakes were upgraded discs with the 1 ton front end, then what I
> need
> >> is a 1.125" bore MC replacement, right?
> >>>
> >>> That is Oreilly's NMC1732 (or the rebuilt 10-1732 for $16) I think, or
> >> 1534 for the 1.25" as an alternative.
> >>>
> >>>
> >>
> http://www.oreillyauto.com/site/c/search.oap?keyword=brake+master+cylinder&year=1976&make=Chevrolet&model=C20+Pickup+RWD&vi=1032039
> >>>
> >>> Thanks for any guidance, I need to do this this afternoon.
> >>>
> >>> Jeff
> >>> --
> >>> 1973/94 GMCII in Boise 76 455 with headers & Patterson distributor,1
> ton
> >> front, 4 bags back, Precision Steering Gearbox
> >>>
> >>>
> >>> _______________________________________________
> >>> GMCnet mailing list
> >>> Unsubscribe or Change List Options:
> >>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >>
> >> _______________________________________________
> >> GMCnet mailing list
> >> Unsubscribe or Change List Options:
> >> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >>
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217687 is a reply to message #217686] |
Sat, 10 August 2013 16:44 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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Haven't been following the thread carefully but just wanted to make sure
you know there are mods to be made to the MC bracket and the pushrod if
you go to the 34mm MC.
I assume we're talking about this MC:
http://farm4.staticflickr.com/3693/9479734011_d2c98f3127_o.jpg
I made a custom support bracket and didn't modify the pushrod.
http://farm4.staticflickr.com/3694/9479733947_2f2dfd8eee_o.jpg
I DID check the pushrod length to make sure I didn't need to make a
longer one.
If you just flatten the OEM bracket and put it BEHIND the MC you need to
make a longer pushrod for sure.
None of this is new info... just making sure you remember before just
swapping parts.
Kelvin
'73 23' in Eugene, OR
On 8/10/2013 1:58 PM, Jerry Wheeler wrote:
> Emery,
> Thanks for the numbers; just what I needed.
> Jerry
>
>
> On Sat, Aug 10, 2013 at 4:49 PM, Emery Stora <emerystora@mac.com> wrote:
>
>> Jerry
>> Forgot to say this also crosses to Wagner F103239, Bendix 11641, EIS
>> E150063 and a CarQuest 20-2234. This is a 34 mm piston bore (approx.
>> 1-21/64").
>>
>> This fits a 1977-96 P35/P3500 Van (with 4 wheel disk brakes) and a P-30
>> Van. It also fits a 1991 C3500 Pickup. It will give sufficient volume for
>> the use of 80mm front calipers added to the front wheels of the GMC and for
>> 4 calipers added to the rear wheels.
>> This master cylinder has a 1/2x20 threaded port for the front chamber and
>> a 9/16x18 threaded port for the back chamber.
>>
>> NOTE: the original GMC master cylinder had the 1/2 in the back and the
>> 9/16 in the front. So it is necessary to move the 9/16" (rear brake line)
>> to the rear chamber and the 1/2" (front brake line) to the front chamber.
>> This is not a problem as this master cylinder has two chambers that are of
>> equal size - unlike the original one that has a smaller front chamber that
>> went to the rear brakes.
>>
>> Emery
>>
>>
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217689 is a reply to message #217687] |
Sat, 10 August 2013 17:14 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
|
Senior Member |
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However, Jerry Wheeler stated that he had a Harrison system so that would have come with a different MC bracket already so he doesn't have to do any mods.
A long time back I had posted how the original bracket could be used between the boost tank and the master cylinder by lenghting the push rod. If anyone wants more details I can repost that message.
Emery Stora
On Aug 10, 2013, at 3:44 PM, Kelvin Dietz wrote:
> Haven't been following the thread carefully but just wanted to make sure
> you know there are mods to be made to the MC bracket and the pushrod if
> you go to the 34mm MC.
>
> I assume we're talking about this MC:
> http://farm4.staticflickr.com/3693/9479734011_d2c98f3127_o.jpg
>
> I made a custom support bracket and didn't modify the pushrod.
> http://farm4.staticflickr.com/3694/9479733947_2f2dfd8eee_o.jpg
>
> I DID check the pushrod length to make sure I didn't need to make a
> longer one.
> If you just flatten the OEM bracket and put it BEHIND the MC you need to
> make a longer pushrod for sure.
>
> None of this is new info... just making sure you remember before just
> swapping parts.
>
> Kelvin
> '73 23' in Eugene, OR
>
>
>
> On 8/10/2013 1:58 PM, Jerry Wheeler wrote:
>> Emery,
>> Thanks for the numbers; just what I needed.
>> Jerry
>>
>>
>> On Sat, Aug 10, 2013 at 4:49 PM, Emery Stora <emerystora@mac.com> wrote:
>>
>>> Jerry
>>> Forgot to say this also crosses to Wagner F103239, Bendix 11641, EIS
>>> E150063 and a CarQuest 20-2234. This is a 34 mm piston bore (approx.
>>> 1-21/64").
>>>
>>> This fits a 1977-96 P35/P3500 Van (with 4 wheel disk brakes) and a P-30
>>> Van. It also fits a 1991 C3500 Pickup. It will give sufficient volume for
>>> the use of 80mm front calipers added to the front wheels of the GMC and for
>>> 4 calipers added to the rear wheels.
>>> This master cylinder has a 1/2x20 threaded port for the front chamber and
>>> a 9/16x18 threaded port for the back chamber.
>>>
>>> NOTE: the original GMC master cylinder had the 1/2 in the back and the
>>> 9/16 in the front. So it is necessary to move the 9/16" (rear brake line)
>>> to the rear chamber and the 1/2" (front brake line) to the front chamber.
>>> This is not a problem as this master cylinder has two chambers that are of
>>> equal size - unlike the original one that has a smaller front chamber that
>>> went to the rear brakes.
>>>
>>> Emery
>>>
>>>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #217690 is a reply to message #217689] |
Sat, 10 August 2013 17:24 |
Jerry Wheeler
Messages: 246
Registered: January 2013
Karma: 2
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Senior Member |
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I have Harrison's bracket and the push rod he supplied with his system.
Thanks for the info that will make others aware that the P30 is not just a
direct swap with the OEM MC.
JR Wheeler
On Sat, Aug 10, 2013 at 6:14 PM, Emery Stora <emerystora@mac.com> wrote:
> However, Jerry Wheeler stated that he had a Harrison system so that would
> have come with a different MC bracket already so he doesn't have to do any
> mods.
> A long time back I had posted how the original bracket could be used
> between the boost tank and the master cylinder by lenghting the push rod.
> If anyone wants more details I can repost that message.
>
> Emery Stora
>
> On Aug 10, 2013, at 3:44 PM, Kelvin Dietz wrote:
>
> > Haven't been following the thread carefully but just wanted to make sure
> > you know there are mods to be made to the MC bracket and the pushrod if
> > you go to the 34mm MC.
> >
> > I assume we're talking about this MC:
> > http://farm4.staticflickr.com/3693/9479734011_d2c98f3127_o.jpg
> >
> > I made a custom support bracket and didn't modify the pushrod.
> > http://farm4.staticflickr.com/3694/9479733947_2f2dfd8eee_o.jpg
> >
> > I DID check the pushrod length to make sure I didn't need to make a
> > longer one.
> > If you just flatten the OEM bracket and put it BEHIND the MC you need to
> > make a longer pushrod for sure.
> >
> > None of this is new info... just making sure you remember before just
> > swapping parts.
> >
> > Kelvin
> > '73 23' in Eugene, OR
> >
> >
> >
> > On 8/10/2013 1:58 PM, Jerry Wheeler wrote:
> >> Emery,
> >> Thanks for the numbers; just what I needed.
> >> Jerry
> >>
> >>
> >> On Sat, Aug 10, 2013 at 4:49 PM, Emery Stora <emerystora@mac.com>
> wrote:
> >>
> >>> Jerry
> >>> Forgot to say this also crosses to Wagner F103239, Bendix 11641, EIS
> >>> E150063 and a CarQuest 20-2234. This is a 34 mm piston bore (approx.
> >>> 1-21/64").
> >>>
> >>> This fits a 1977-96 P35/P3500 Van (with 4 wheel disk brakes) and a P-30
> >>> Van. It also fits a 1991 C3500 Pickup. It will give sufficient
> volume for
> >>> the use of 80mm front calipers added to the front wheels of the GMC
> and for
> >>> 4 calipers added to the rear wheels.
> >>> This master cylinder has a 1/2x20 threaded port for the front chamber
> and
> >>> a 9/16x18 threaded port for the back chamber.
> >>>
> >>> NOTE: the original GMC master cylinder had the 1/2 in the back and the
> >>> 9/16 in the front. So it is necessary to move the 9/16" (rear brake
> line)
> >>> to the rear chamber and the 1/2" (front brake line) to the front
> chamber.
> >>> This is not a problem as this master cylinder has two chambers that
> are of
> >>> equal size - unlike the original one that has a smaller front chamber
> that
> >>> went to the rear brakes.
> >>>
> >>> Emery
> >>>
> >>>
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #222538 is a reply to message #217674] |
Sun, 15 September 2013 15:25 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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| Jerry Wheeler wrote on Sat, 10 August 2013 14:16 |
I do not see a replacement number in the GMCMI parts book for the P30
master cylinder.
|
Just ordered a P30 to replace my inventory when Rob Meuller needed mine. Ordered from RockAuto: Dorman M39309 $53.79.
The 1 1/4 MC that is a bolt in replacement for stock is a WAGNER R79821 and they are on closeout for less than 10 bucks.
I'll probably go to the P30 when I install my Manny 1 ton that is waiting in the shop.
I think the bore is the same but it has a considerably larger resivor which is needed with larger calipers.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
|
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| Re: [GMCnet] Which Brake Master Cylinder Replacement [message #222550 is a reply to message #222538] |
Sun, 15 September 2013 16:18 |
Jerry Wheeler
Messages: 246
Registered: January 2013
Karma: 2
|
Senior Member |
|
|
i also ordered the dorman m39309 mc; will install it when i return to nc in
6 weeks.
jr wheeler 78 royale nc/or
On Sun, Sep 15, 2013 at 4:25 PM, Kerry Pinkerton <Pinkertonk@mchsi.com>wrote:
>
>
> Jerry Wheeler wrote on Sat, 10 August 2013 14:16
> > I do not see a replacement number in the GMCMI parts book for the P30
> > master cylinder.
>
>
> Just ordered a P30 to replace my inventory when Rob Meuller needed mine.
> Ordered from RockAuto: Dorman M39309 $53.79.
>
> The 1 1/4 MC that is a bolt in replacement for stock is a WAGNER R79821
> and they are on closeout for less than 10 bucks.
>
> I'll probably go to the P30 when I install my Manny 1 ton that is waiting
> in the shop.
>
> I think the bore is the same but it has a considerably larger resivor
> which is needed with larger calipers.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as
> an Art Deco car hauler
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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