70 RR Front Drum To Disc Brake Conversion Mopar Newbie Question

[soundhd]

Have a 70 RR I recently purchased. 383/Auto; has 4 wheel power drum brakes. Plan on converting the front to disc using a Wilwood kit. (will be doing the rears later in the year). They have a couple bolt on kits for 14" & 15" wheels.
Not sure what all else I will have to or should change (master cylinder, booster, proportioning valve, lines from master cyl. to "p" valve, etc....). I also plan on changing the brake hoses to the braided type. Have included photos of the master cylinder/booster and a couple of the "P" valve.
Car was "restored" about 10 years ago and I not really sure if all the brake parts in the photos are stock/correct or not.
Car has stock 14" wheels but do plan on changing over to 15" aftermarket wheels of some sort.....
Any help would be greatly appreciated.

Thanks

 

[PurpleBeeper]

First, I will say that I am no brake expert, but I've got a 70 Road Runner and know a little bit. It "looks" like you already have a front disk/rear drum master cylinder on there (large resevoir in back for front disc brakes) and the power booster looks correct for a1970 power disc car. Your proportioning valve looks exactly like mine (original power front disc car), so I think you're good on everything else as is.

 

[HT413]

Yup, that's a disc drum m/c, so that's one less thing you need to do. You'll have to swap that for a disc/disc when you do the rears. I'm sure you know this, but the 14" kit will allow the 5" wheels but the 15" kit means say bye bye to 14's. so if you might want to stay w 14's ever again, just get the 14" kit. Braking will be good either way.

 

[soundhd]

Thanks for the replies and info. Just to double check, the distribution block in the photo is also a proportioning valve for front disc and rear drums? If so, I do not need to change anything when changing over to a disc kit for the fronts? ( then when I change over to rear disc I will to install a disc/disc M/C and booster along with a proper proportioning valve).

Thanks

First, I will say that I am no brake expert, but I've got a 70 Road Runner and know a little bit. It "looks" like you already have a front disk/rear drum master cylinder on there (large resevoir in back for front disc brakes) and the power booster looks correct for a1970 power disc car. Your proportioning valve looks exactly like mine (original power front disc car), so I think you're good on everything else as is.

 

[HT413]

I think the best answer is 'it depends'. I would just do the swap without adding/changing the prop valve/dist block. Get it all running and go out for a drive and test em. If your rear brakes lock up too easily, you need to change the prop valve or add an adjustable one in line. It all depends on a lot of factors, such MC size, rear wheel cylinder size, front piston size, tire diameter, width and compound, weight distribution, etc.