Rear drum to PBR in a 92 Questions Inside.
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
Rear drum to PBR in a 92 Questions Inside.
Ok, first off, I did a search but did not find an exact answer to my question. 
With that being said: I just picked up a 9 bolt with rear PBR's on it. My car (1992 T/A Vert) is Cast front disk/rear drum. The front brakes are staying stock for now.
Now, my question: Is the stock Prop Valve the right one for this set up? I know that the rear PBR's were offered without the front 1le brakes in this year, so Im assuming that this valve is the correct one, but Im not %100 sure.
Thanks for your help!
With that being said: I just picked up a 9 bolt with rear PBR's on it. My car (1992 T/A Vert) is Cast front disk/rear drum. The front brakes are staying stock for now.
Now, my question: Is the stock Prop Valve the right one for this set up? I know that the rear PBR's were offered without the front 1le brakes in this year, so Im assuming that this valve is the correct one, but Im not %100 sure.
Thanks for your help!
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
My parts and illustration manual only covers up to '91 year models, but look a bit down this page for the part numbers listed there:
https://www.thirdgen.org/techbb2/sho...e&pagenumber=2
It should be the same anyway. I would think you may have to change to P/N 10164112 unless you go with 1LEs on the front, then go with 10136840.
J65= disc/disc
J41= disc/drum, iron
J42= disc/drum, aluminum
HTH...Ed
https://www.thirdgen.org/techbb2/sho...e&pagenumber=2
It should be the same anyway. I would think you may have to change to P/N 10164112 unless you go with 1LEs on the front, then go with 10136840.
J65= disc/disc
J41= disc/drum, iron
J42= disc/drum, aluminum
HTH...Ed
I'm basically trying to figure out the same thing that you are in this current thread. If what you say is true then I may not need to change my valve either and I HAVE upgraded to 1LE's and they work fine.
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
Werent the PBR calipers the ONLY rear brake calipers used after 88? If I remember correctly, the old style cast calipers were discontinued due to problems with them, and 88 was the last year they were used.
Basically, I need the valve off of lets say a 91 GTA with disk/disk. That car should have the cast calipers up front, and the PBR calipers in the rear.
I read alot of the previous threads, including Eds, but I still cant really find anything concrete.
Basically, I need the valve off of lets say a 91 GTA with disk/disk. That car should have the cast calipers up front, and the PBR calipers in the rear.
I read alot of the previous threads, including Eds, but I still cant really find anything concrete.
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
I just came across this quote...
So hes saying that 89-92 prop valve's/mc's are all the same?
Originally posted by ANDYZ28
I tried to answer this question by editing question #2. I added the 89-92 info. But I will state it again here.
If you have an 89-92 with disc/drum, or 4 wheel disc brakes. Then you should already have the correct master cyl and proporioning valve.
I tried to answer this question by editing question #2. I added the 89-92 info. But I will state it again here.
If you have an 89-92 with disc/drum, or 4 wheel disc brakes. Then you should already have the correct master cyl and proporioning valve.
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
And then theres this... Who is right?
Originally posted by mystikkal_69
from the info posted you do infact have a standard(J41/J42 disc/drum as presviously metioned. do you have the complete 1LE system or just the rear. if you do have the whole the system then 10136840 is the right choice. if you only have the rear then
10136841 is the right choice.
90 J41, J42..........10136839 <--- (you have this one) broadcast MB
90 J65, 1LE..........10136840 <--- broadcast code MD
90 J65(EXC 1LE)..10136841 <--- broadcast code MC
from the info posted you do infact have a standard(J41/J42 disc/drum as presviously metioned. do you have the complete 1LE system or just the rear. if you do have the whole the system then 10136840 is the right choice. if you only have the rear then
10136841 is the right choice.
90 J41, J42..........10136839 <--- (you have this one) broadcast MB
90 J65, 1LE..........10136840 <--- broadcast code MD
90 J65(EXC 1LE)..10136841 <--- broadcast code MC
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From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
89-92 MC were same on disc/disc & disc/drum cars. what i posted is what GM has listed for a 90 F-body application. this damn combo valve dilemna drives everyone nuts.
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
Im gonna call my buddy at the dealer tomorrow and straighten all this crap out. Ill post definate answers as soon as I get them.
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From: Midlothian,VA. 23112-6108
Car: 1982 Z-28
Engine: 5.0 w/ Holly carb
Transmission: TH-700R4
I sure wish my old "1LE questions sticky post" was still up.https://www.thirdgen.org/techbb2/sho...=1LE+Questions
But I will try and answer this question.
GM part#s 10136840 and 10136841 have been superceded (combined) by GM part# 10136839.
The combination valve you need is GM part# 10164112 (AC Delco part# 172-2074) broadcast code MC/MD.
Beginning in late 1989 through the end of production in 1992 this 10164112 was used on ALL J65 and 1LE equipped cars.
So if your late '89-'92 car was originally equipped with rear drum brakes? Then you will need to change the combination valve to 10164112.
I hope I have been of some help in clearing this up.
Thanx,ANDYZ28
But I will try and answer this question.
GM part#s 10136840 and 10136841 have been superceded (combined) by GM part# 10136839.
The combination valve you need is GM part# 10164112 (AC Delco part# 172-2074) broadcast code MC/MD.
Beginning in late 1989 through the end of production in 1992 this 10164112 was used on ALL J65 and 1LE equipped cars.
So if your late '89-'92 car was originally equipped with rear drum brakes? Then you will need to change the combination valve to 10164112.
I hope I have been of some help in clearing this up.
Thanx,ANDYZ28
Last edited by ANDYZ28; Sep 23, 2002 at 05:52 AM.
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Yeah, what Andy said. I've gotten a bit confused with all the numbers going fast and turning left in my head.
Ed
Ed
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From: Cherry Hill, NJ
Car: 92 Trans Am 'Vert
Engine: 305 TPI
Transmission: 5 Speed
Thanks Andy! Yeah, my car was origonally rear drum, so Ill order that 10164112.
LOL @ Eb. I hear ya... too many damn numbers!
LOL @ Eb. I hear ya... too many damn numbers!
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