Single to Dual Res Master Cylinder Conversion - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**LostMy65** · 10-17-2020, 04:42 PM

Please don't close this thread, and please add it to the FAQs. Thanks.

BabyBlue64 · 10-22-2020, 07:12 AM

Last week I saw my original single Master cylinder is leaking, so I want to do this upgrade also. I found this thread but the pictures in the original write up are gone

**Captainfab** · 10-22-2020, 10:23 PM

If you are staying with manual drum/drum brakes it is quite simple. All you need is a '67-'70 master cylinder. The front port is the front brakes and the rear port is the rear brakes. Then you will need to add a second line on the back of the suspension crossmember to feed brake line that goes to the rear.

Quote:

Originally Posted by BabyBlue64

Last week I saw my original single Master cylinder is leaking, so I want to do this upgrade also. I found this thread but the pictures in the original write up are gone

**jocko** · 10-22-2020, 10:40 PM

BabyBlue, I’m still seeing the pictures, they were attached thru this site, not a third party host, so should be visible. Can you let me know which posts you are not seeing the pictures on?

BabyBlue64 · 10-23-2020, 02:32 AM

Hi Jocko, I mean the pictures of Chief's original write up, where you refer to in post #12.

D'Monsta · 12-16-2020, 07:13 PM

My single was leaking so I decided to do this conversion today.. all bled, feels like good pedal, but the brakes barely grab and just kind of coast to a stop no matter how much leg I put into it.. Is there a special way to bleed a dual master or is the 'furthest away, then next furthest, etc.. still the way to do these? I read somewhere else that the front and back from each side should be bled at the same time.. Gotta get this done.. My brakes are worse now than with the single MC

**jayoldschool** · 12-16-2020, 08:05 PM

Did you bench bleed the master? Bleed order: RR LR RF LF. Sounds like you have air. Maybe open up both rears and gravity bleed it for a bit, keep topping master. Then do fronts. Then, two person pressure bleed in order.

D'Monsta · 12-16-2020, 10:24 PM

Yes, Bench bled the master.. I will redo the bleeding sequence tomorrow.. Probably time for brake shoes too but I want to get the hydraulics in order first..
Thanks..

**Captainfab** · 12-16-2020, 10:35 PM

The correct brake bleeding order is LR, RR, RF, LF.

D'Monsta · 12-17-2020, 03:43 PM

Thanks Gents.. Got it done.. Nice high. firm pedal.. Will lock up with a firm push now.. I used 3 couplings, one plug, one length of new tubing and some pre-made supply tubes from NAPA.. Nothing fancy but it works great. Peace of mind.. Fixed the E-brake a while back too..

**G8rN@te61** · 12-29-2021, 05:01 PM

I found this thread as I am in the process of looking at changing out my master cylinder and doing some all around brake work. Question I have is when changing out the master cylinder, how do you handle the clutch that operates off it too? I have a '61 btw.

**LostMy65** · 12-29-2021, 09:59 PM

Quote:

Originally Posted by G8rN@te61

I found this thread as I am in the process of looking at changing out my master cylinder and doing some all around brake work. Question I have is when changing out the master cylinder, how do you handle the clutch that operates off it too? I have a '61 btw.

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These threads might help:
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http://67-72chevytrucks.com/vboard/s...d.php?t=362375.
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http://www.67-72chevytrucks.com/vboa...d.php?t=339335
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http://67-72chevytrucks.com/vboard/s...d.php?t=300087
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10-17-2020, 04:42 PM	#51
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,460	Re: Single to Dual Res Master Cylinder Conversion Please don't close this thread, and please add it to the FAQs. Thanks. __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

10-22-2020, 07:12 AM	#52
BabyBlue64 Registered User Join Date: Dec 2016 Location: Noordwijkerhout, Netherlands Posts: 56	Re: Single to Dual Res Master Cylinder Conversion Last week I saw my original single Master cylinder is leaking, so I want to do this upgrade also. I found this thread but the pictures in the original write up are gone

10-22-2020, 10:40 PM	#54
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,932	Re: Single to Dual Res Master Cylinder Conversion BabyBlue, I’m still seeing the pictures, they were attached thru this site, not a third party host, so should be visible. Can you let me know which posts you are not seeing the pictures on?

10-23-2020, 02:32 AM	#55
BabyBlue64 Registered User Join Date: Dec 2016 Location: Noordwijkerhout, Netherlands Posts: 56	Re: Single to Dual Res Master Cylinder Conversion Hi Jocko, I mean the pictures of Chief's original write up, where you refer to in post #12.

12-16-2020, 07:13 PM	#56
D'Monsta Registered User Join Date: Aug 2020 Location: Charlotte Posts: 48	Re: Single to Dual Res Master Cylinder Conversion My single was leaking so I decided to do this conversion today.. all bled, feels like good pedal, but the brakes barely grab and just kind of coast to a stop no matter how much leg I put into it.. Is there a special way to bleed a dual master or is the 'furthest away, then next furthest, etc.. still the way to do these? I read somewhere else that the front and back from each side should be bled at the same time.. Gotta get this done.. My brakes are worse now than with the single MC

12-16-2020, 08:05 PM	#57
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,150	Re: Single to Dual Res Master Cylinder Conversion Did you bench bleed the master? Bleed order: RR LR RF LF. Sounds like you have air. Maybe open up both rears and gravity bleed it for a bit, keep topping master. Then do fronts. Then, two person pressure bleed in order.

12-16-2020, 10:24 PM	#58
D'Monsta Registered User Join Date: Aug 2020 Location: Charlotte Posts: 48	Re: Single to Dual Res Master Cylinder Conversion Yes, Bench bled the master.. I will redo the bleeding sequence tomorrow.. Probably time for brake shoes too but I want to get the hydraulics in order first.. Thanks..

12-16-2020, 10:35 PM	#59
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Single to Dual Res Master Cylinder Conversion The correct brake bleeding order is LR, RR, RF, LF. __________________ 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

12-17-2020, 03:43 PM	#60
D'Monsta Registered User Join Date: Aug 2020 Location: Charlotte Posts: 48	Re: Single to Dual Res Master Cylinder Conversion Thanks Gents.. Got it done.. Nice high. firm pedal.. Will lock up with a firm push now.. I used 3 couplings, one plug, one length of new tubing and some pre-made supply tubes from NAPA.. Nothing fancy but it works great. Peace of mind.. Fixed the E-brake a while back too.. Attached Images

12-29-2021, 05:01 PM	#61
G8rN@te61 Senior Member Join Date: Oct 2017 Location: Fort Mill, SC Posts: 203	Re: Single to Dual Res Master Cylinder Conversion I found this thread as I am in the process of looking at changing out my master cylinder and doing some all around brake work. Question I have is when changing out the master cylinder, how do you handle the clutch that operates off it too? I have a '61 btw.



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