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#1027342 - 07/24/15 11:25 AM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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New BTR Stage 4 cam makes 449 HP and 380 TQ TQ at the wheels. 6.0 LY6 VVT and 4L85E!blackgoldaero http://www.cardomain.com/ride/671193
#1049533 - 04/03/17 04:05 AM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Buick Runner Offline
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Dharma station 1 the Hydra
Looks like I may do this upgrade since my stock dual booster died.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1050276 - 04/24/17 03:11 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Perry, IA
Howdy all!
I get to pay some "Stupid Tax." I power washed the engine compartment 3 weeks ago before I put the engine back in the car after a "refresh." I must have got some water in the booster as it is failing (pancake style). That having been said, I have never been truly happy with the brakes. The rear is a Ford 9in with disc brakes that I bought from Quick Performance. I have bypassed the stock proportioning valve for one I got from them. I was doing some research on the difference between the 9in dual and my 12 inch single booster when I found this thread. Thanks! I figure, all else being equal, considering I have to replace this thing anyway, I just as well consider this an upgrade??

So, I went DIRECTLY to RockAuto and looked up a booster for a 1990 Caprice with a v8. https://www.rockauto.com/en/catalog...&+wheel+hub,power+brake+booster,1884

I have 3 x questions. I plan on re-using my current Master Cyl (factory style for a 1979 Monte Carlo). If it matters, this car was originally a 231 V6 car.

1) Do I want one with or without the Vacuum Switch Port? Was GUESSING without, but was not 100% sure.
2) Does anybody know if these boosters come with the new pin? And just to clarify, I still use this pin with the Caprice booster and the Monte Carlo Master Cyl?
3) This does not look TOO much thicker than the pancake style I'm removing, so I'm assuming the brake lines won't need and modifications as they leave the Master Cyl?

Thanks again!
Russ

#1050277 - 04/24/17 03:38 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Russ,
1) If your original 12" single diaphragm booster has the vacuum switch port, then order one with the port. The images in my original post show the port present (in an 86 SS).
2) Yes, the booster will come with a new pin that is matched in length to that specific new booster. Do not use the pin from the old booster.
3) While the master cylinder is positioned slightly more forward due to the increased thickness of the booster, the brake lines won't need to be modified. They should have sufficient flex and slack to accommodate the slight re-positioning.

Good luck!

PaulC


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#1050280 - 04/24/17 04:07 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Perry, IA
Thanks for the super quick reply!

Originally Posted by Z65_Paul

1) If your original 12" single diaphragm booster has the vacuum switch port, then order one with the port. The images in my original post show the port present (in an 86 SS).


Does the vacuum switch port screw into the intake manifold and look like this:

[Linked Image]

If so, I don't have that. Mine comes out of that elbow on the booster and goes to the port on the back of the carburetor.

Originally Posted by Z65_Paul

2) Yes, the booster will come with a new pin that is matched in length to that specific new booster. Do not use the pin from the old booster.


Thanks for confirming that!

Originally Posted by Z65_Paul
3) While the master cylinder is positioned slightly more forward due to the increased thickness of the booster, the brake lines won't need to be modified. They should have sufficient flex and slack to accommodate the slight re-positioning.

Thanks again!

Reading this, I don't see a down side to putting this booster on my car.

How did I get stuff done before these forums existed? LOL!

THANKS!

#1050297 - 04/25/17 04:39 AM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Russ,
The TVS (Thermal Vacuum Switch) image you posted.. that goes on the thermostat housing at the front of the engine. To my knowledge it's not associated with the brake booster. The vacuum port I think they're talking about is mounted on the booster itself. If you look back at the first post, the image with the two boosters sitting on the ground next to one another... the vacuum port is in the upper left of each booster at about the 10 o'clock position. If your original booster has this port, then you want a replacement booster with the vacuum switch port.

PaulC


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#1050302 - 04/25/17 12:21 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Maverick_Monte Offline
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Perry, IA
Originally Posted by Z65_Paul

The TVS (Thermal Vacuum Switch) image you posted.. that goes on the thermostat housing at the front of the engine. To my knowledge it's not associated with the brake booster. The vacuum port I think they're talking about is mounted on the booster itself. If you look back at the first post, the image with the two boosters sitting on the ground next to one another... the vacuum port is in the upper left of each booster at about the 10 o'clock position. If your original booster has this port, then you want a replacement booster with the vacuum switch port.


Paul, thanks for the info. I googled the term "Vacuum switch port" to see if I could figure it out and Google lied to me! ;-)

I just went out to the shop and snapped these pics of the outgoing booster.

[Linked Image]


[Linked Image]


I went back to Rock auto and looked at what they have listed for my car originally. That was this:

https://www.rockauto.com/en/moreinfo.php?pk=259020&cc=1055977&jsn=10579

I don't see any mention of a vacuum switch port on the original style for my car that the Caprice ones mention. Can you tell from my pictures if mine has the vacuum switch port? The one I ordered did NOT have one. I can always return it if needed.

Is the little elbow coming out of the booster, that goes to the back of the carb, the switch in question?

I ordered this one:
https://www.rockauto.com/en/moreinfo.php?pk=2961087&cc=1037203&jsn=1


Thanks again!

#1050310 - 04/25/17 03:11 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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I think you're good to go with the booster you ordered. Let us know how it went and show it off with some pics!

PaulC


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#1050312 - 04/25/17 03:29 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Buick Runner Offline
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The booster I ordered from Rockauto did not come with a new mounting gasket, so I had to order one from Mike's Montes. Its not a part most places bother to carry. The old 9 in dual booster in my Regal lacks the vacuum port.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1050331 - 04/25/17 09:19 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Z65_Paul]  
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Maverick_Monte Offline
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Perry, IA
One more concern as I look at the pictures of my stock booster. The paint below the booster is coming off. I'm wondering if the Master cylinder isn't leaking out the back as well.

[Linked Image]

I've spent the last hour or two (time gets away from me) reading about upgrading the master cylinder as well. Being a 1979 Monte, Mine USED to have the proportioning valve under the floorboard. I got a new valve with a dial when I upgraded to the rear discs several years back. IF the master cylinder is leaking, should I also get a master cylinder from a 1990 Caprice as well? As the stock style from mine is set up for rear drum brakes.

Another concern reading posts here is the threads. Will the 1990 master cylinder have the same threads as my current brake lines? I can EASILY knock this out over the weekend if I get the parts in line now. My 1990 Caprice booster will be in on Friday.

Thanks again!

#1050378 - 04/27/17 03:55 PM Re: B-Body Dual Diaphram Brake Booster Upgrade [Re: Buick Runner]  
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Perry, IA
Originally Posted by Buick Runner
The booster I ordered from Rockauto did not come with a new mounting gasket, so I had to order one from Mike's Montes. Its not a part most places bother to carry. The old 9 in dual booster in my Regal lacks the vacuum port.


I assume you mean the gasket between the booster and the firewall? Did your RockAuto booster come with the "plunger" from the booster to the Master Cylinder?

Yesterday I picked up my Master Cylinder for a 1990 Caprice:
https://shop.advanceautoparts.com/p...-10-1870/5352363-P?searchTerm=master+cyl

Was only $25. Even if the master Cylinder ISN'T leaking causing the paint on the current booster to come off, having a master cylinder that sends the PROPER amount of brake fluid to the upgraded rear discs CAN'T be a bad thing. I'm excited to see what all I've been missing all these years with my back brakes!

My Booster should be in today. Which will give me a matched booster and Master Cylinder. (for a 1990 Caprice) I can get it all installed over the weekend.

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