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| | | | Joined: Mar 2002 Posts: 126 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2002 Posts: 126 | I am considering upgrading to a dual master cylinder brake system on my 42 3/4 ton. Does anyone have pictures, instructions or a link to a page that describes this? Thanks in advance.
Chris Simmonds
1942 Chevy 3/4 ton
| | | | | Joined: Jan 2001 Posts: 30 Member | | Member Joined: Jan 2001 Posts: 30 | Are you only changing the m/c or are you upgrading brakes also? | | | | | Joined: Mar 2002 Posts: 126 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2002 Posts: 126 | Just master cylinder. Just want to make sure I always have at least two wheels stopping me. 
Chris Simmonds
1942 Chevy 3/4 ton
| | | | | Joined: Jan 2001 Posts: 30 Member | | Member Joined: Jan 2001 Posts: 30 | Should be some archived info on this on the site. I'm assuming your 3/4 ton has brake pedals same as my 46 1/2 ton-- if so, fab bracket to fit in place of stock m/c. Find a m/c which ports on the right side (as it would be on a newer firewall install). Bolt m/c to bracket (now the ports will be on driver's side), replumb and adjust rod to your pedal. Look at some of the brake kit sites for helpful info on residual valves and proportioning valves. If you can't fab the bracket yourself, look at chassisengineering site or classicperform site. While you are doing this, it would be a good time to replace all of your brake lines and hoses. | | | 
#9004 05/06/2002 11:48 PM | Joined: Feb 2002 Posts: 21 Member | | Member Joined: Feb 2002 Posts: 21 | Chris There are a number of issues here. You have to maintain a 60% front - 40% back, minimum braking ratio (or some times even more towards the front). I fitted ventilated discs to the front of my '64 Bel Air and did not have to use a proportioning valve in the rear brake line by changing the rear wheel cylinders (the whole thing came as a kit and all the testing had already been done). It was a long time ago and I can't remember if they were smaller or larger diameter in the bore (someone out there will know). I also agree with Richard too and a proportioning valve might be the way to go. It will probably take some fit and test to come up with the right combination. OLD 42  | | |
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