Power Brakes Booster Switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brim · 03-14-2020, 04:46 PM

What's up guys? Got a question for everyone, does anyone know what this switch is for? It came with my truck 64 fleetside lwb. I'm not sure that it even works but it connects to my brake master cylinder.
I think it's some sort of power brake switch? Maybe for stopping when towing? Here is a pic of my truck and the switch. By the way I have drums all the way around but that is soon to change shortly. Going with the disc/drum setup.

Brim · 03-14-2020, 06:30 PM

I plan on going with this kit from Summit
https://www.summitracing.com/parts/clp-6370swbk-5d

Along with this proportioning valve
https://www.jegs.com/i/JEGS/555/631302/10002/-1

I'm just not sure if I should change the master cylinder out to the one with a large/small bowl? And do away with this switch?

I think the m/c I have now is from a mid 70's Nova but it's been over 3 years since my truck has been on the road and it took a couple of trips to O'Riley's to get one that would work with my original push rod.

Brim · 03-14-2020, 06:31 PM

If you look to the area where the arrow is pointing you can see that the booster and M/C sits offset at an angle. When any of you guys did your conversion did you have to change this?

sstock · 03-14-2020, 11:32 PM

Trailer brake controller --old style

Brim · 03-15-2020, 04:29 PM

Quote:

Originally Posted by sstock

Trailer brake controller --old style

Cool, so I guess it would be ok to by pass it.Thanks

**Captainfab** · 03-15-2020, 09:45 PM

When you switch to discs on the front you will need a disc/drum master cylinder. The only master cylinder that I know of that might work with that booster and it's long intermediate pushrod is a '68-'76 Corvette master cylinder. Even though it is designed for a disc/disc system, many people use them on disc/drum systems. I would suggest an adjustable prop valve with it so that you can dial in your brake bias. The other option would be to remove the original booster and it's bracket and use one of my booster brackets with an off the shelf disc/drum booster and master.

Yes you can eliminate the trailer brake controller and it's plumbing if you do not need it.

Brim · 03-15-2020, 10:28 PM

Quote:

Originally Posted by Captainfab

When you switch to discs on the front you will need a disc/drum master cylinder. The only master cylinder that I know of that might work with that booster and it's long intermediate pushrod is a '68-'76 Corvette master cylinder. Even though it is designed for a disc/disc system, many people use them on disc/drum systems. I would suggest an adjustable prop valve with it so that you can dial in your brake bias. The other option would be to remove the original booster and it's bracket and use one of my booster brackets with an off the shelf disc/drum booster and master.

Yes you can eliminate the trailer brake controller and it's plumbing if you do not need it.

Thanks for the info. I will send you a PM.

**Captainfab** · 03-16-2020, 09:42 PM

PM replied to.

**jayoldschool** · 03-17-2020, 03:53 PM

Is that teflon tape on your brake fittings??

Brim · 03-20-2020, 08:12 PM

Quote:

Originally Posted by jayoldschool

Is that teflon tape on your brake fittings??

yep

**jayoldschool** · 03-21-2020, 01:04 PM

That should not be on there. The double flare provides the seal.

03-14-2020, 04:46 PM	#1
Brim Registered User Join Date: Aug 2016 Location: Houston Posts: 67	Power Brakes Booster Switch What's up guys? Got a question for everyone, does anyone know what this switch is for? It came with my truck 64 fleetside lwb. I'm not sure that it even works but it connects to my brake master cylinder. I think it's some sort of power brake switch? Maybe for stopping when towing? Here is a pic of my truck and the switch. By the way I have drums all the way around but that is soon to change shortly. Going with the disc/drum setup. Attached Images

03-14-2020, 06:30 PM	#2
Brim Registered User Join Date: Aug 2016 Location: Houston Posts: 67	Re: Power Brakes Booster Switch I plan on going with this kit from Summit https://www.summitracing.com/parts/clp-6370swbk-5d Along with this proportioning valve https://www.jegs.com/i/JEGS/555/631302/10002/-1 I'm just not sure if I should change the master cylinder out to the one with a large/small bowl? And do away with this switch? I think the m/c I have now is from a mid 70's Nova but it's been over 3 years since my truck has been on the road and it took a couple of trips to O'Riley's to get one that would work with my original push rod.

03-14-2020, 06:31 PM	#3
Brim Registered User Join Date: Aug 2016 Location: Houston Posts: 67	Re: Power Brakes Booster Switch If you look to the area where the arrow is pointing you can see that the booster and M/C sits offset at an angle. When any of you guys did your conversion did you have to change this? Attached Images

03-14-2020, 11:32 PM	#4
sstock Registered User Join Date: Mar 2014 Location: Tacoma Wa Posts: 146	Re: Power Brakes Booster Switch Trailer brake controller --old style __________________ 1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange 1964 GMC 1000 series,custom, 305E, sm420

03-15-2020, 09:45 PM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Power Brakes Booster Switch When you switch to discs on the front you will need a disc/drum master cylinder. The only master cylinder that I know of that might work with that booster and it's long intermediate pushrod is a '68-'76 Corvette master cylinder. Even though it is designed for a disc/disc system, many people use them on disc/drum systems. I would suggest an adjustable prop valve with it so that you can dial in your brake bias. The other option would be to remove the original booster and it's bracket and use one of my booster brackets with an off the shelf disc/drum booster and master. Yes you can eliminate the trailer brake controller and it's plumbing if you do not need it. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-16-2020, 09:42 PM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Power Brakes Booster Switch PM replied to. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-17-2020, 03:53 PM	#9
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,156	Re: Power Brakes Booster Switch Is that teflon tape on your brake fittings??

03-21-2020, 01:04 PM	#11
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,156	Re: Power Brakes Booster Switch That should not be on there. The double flare provides the seal.



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