Hi all - currently have an all drum brake setup but will be converting front brakes to disc. Was told I should replace my existing master cylinder for one that's compatible with a disc-drum setup (currently have power brakes). Would something like this work with the existing vacuum booster in my truck?

Thanks!

 

No idea what you have?

My '77 F-150 had a single diaphrgm 11" booster with original MC that powered front disc / rear drums. I changed a few items, calipers, etc .... and bolted in a F-350 dual diaphragm 9" booster and MC combo.

 

So stock my 75 F100 has drums all around. Below is the current booster/MC setup; I've no idea what the part number is (it's too caked with crud to make anything up). I will be swapping in all new hardware for a disc conversion - but I am trying to figure out what I should do in terms of the MC - I was told the drum/drum MC wont work for a disc/drum setup.

 

You'll also need a proportioning valve when converting the front to disc.

 

Yup - that I got.

 

Just curious .... but why the swap to disc brakes?

I've had both, and always found drums OK unless using constantly on long down grades, and even they will fade if over used. Drums do "self energise", disc do not.

My '77 uses a bracket with bell crank set up, the booster / MC dio not mount to the firewall.

 

I am just not happy with the performance of the drum brakes, and despite the many adjustments we've tried to do, it keeps pulling to the left under moderate/heavy braking. Slam on the brakes and it will heavily jerk. I've had enough and decided to start fresh with discs up front. Plus it's getting spruced up with new wheels and such, and cosmetically I like the disc/drum look - my preference

Isn't that the factory setup? Mine is the same - the booster doesnt touch the firewall but rather mounted to a bracket.

 

dunno if it's relevant but I once had a 60 Econoline do the same jerk to the left - turned out to be a left front spring issue.

 

Unfortunately - that wasn't the case for me.

 

Alignment faults will cause a brake pull too.I was not sure looking at your picture.

 

And that's also a valid point - but believe me when I say we went through everything. Either way - the kit is here; I am just missing the MC part

 

There isn't any reason to change anything. Master cylinders are the same other than the disc got a bigger reservoir. No reason to change it over till it finally goes bad. Some people try to claim there are residual valves in the master cylinders but I've rebuilt both many times and have yet to come across one. Proportioning valves don't care if it's disc or drum.