Front drum to disc conversion

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May 16, 2013 | 04:11 PM

#46

AXracer

Hotshot

Joined: Oct 2004

Posts: 15,882

Likes: 88

From: Durham NC

Quote:

Originally Posted by B Todd

Axracer thanks again for your advice. I've read through at least some of the other threads on converting my '51 F1 to front disc brakes and upgrading the master cylinder. I decided to go with no booster and the adapter available from Sacramento Vintage. Reason being the truck has the original 3 speed and the boostered mc's require alterations to the clutch linkage and possibly the tranny crossmember. So now the question is, do I get a dual chamber master cylinder for a car that has disc in front and drum on the rear, or do I get a 4 wheel drum brakes mc? And if I get the disc in front drum in rear mc, should I also install the residual in line valves just to be safe, or would I be causing problems by having them in line if they aren't needed?

you need a MC for disc drum application. You can use a disc disc but then you will need a separate proportioning valve. With the MC below the wheel cylinders, as in any underfloor install you definitely will need residual valves, one for discs in the front line and one for drums in the rear line don't try to do without them. They are inexpensive, just be sure you put the right one in the right line (they are color coded) and orient them in the right direction (they have arrows or markings). They go in the line close to the MC. The new MC cover will not line up with the floor inspection cover, and be close to the floor. I'd suggest moving the inspection cover making sure it is big enough (I think it will end up under the seat, so be sure you can remove the seat) otherwise you will have to use a mirror to check the fluid level and a syringe or pump to fill it with from underneath, a real pain (literally) when bleeding the brakes!

May 16, 2013 | 04:20 PM

#47

B Todd

5th Wheeling

Joined: May 2013

Posts: 42

Likes: 0

Quote:

Originally Posted by AXracer

Would rather not cut up the cab floor. With the nonbooster adaptor, the offset doesn't seem huge (a few inches, maybe more), so I'm hoping I can go in through the existing port and use a mirror and funnel with flex tubing to fill it. Will get the residual valves. I think I have a pretty good idea of what to do now. Thanks again. Oh, and thanks for the offer on your non booster set up, but the 53 & up appears to be different.