1991 Beretta v6 master cylinder

[1988GTU]

Are there easy swappable mini boosters that can be used with a higher front and equivalent ratio rear matching master?

Hrmmm

[3X00-Modified]

It does make me wonder if the rear hoses need to be upgraded when converting to all-wheel disc on the Berettas though...

That's somewhat of a stupid statement... sorry to sound harsh... But you have to change the rear lines. It needs to be upgraded to a braided line that can attach to a caliper... Factory is a short U shaped rubber line that attaches from the body to the axle then from there it's a hard line to the wheel cylinder... you can't re-use that because you need to mount a flexible line to a caliper to allow it to move.

[Rettax3]

It does make me wonder if the rear hoses need to be upgraded when converting to all-wheel disc on the Berettas though...

That's somewhat of a stupid statement... sorry to sound harsh... But you have to change the rear lines. It needs to be upgraded to a braided line that can attach to a caliper... Factory is a short U shaped rubber line that attaches from the body to the axle then from there it's a hard line to the wheel cylinder... you can't re-use that because you need to mount a flexible line to a caliper to allow it to move.

Duh! Sorry, let me rephrase, how about the hose going into those hard-lines? I am sure it is rated for well above the operating pressure, but it isn't necessarily designed for the higher pressure associated with the rear disc. Oh well, this is one of the upgrades I likely won't be worried about -the front brakes need upgrading long before I consider messing around with the rears.

[3X00-Modified]

That's somewhat of a stupid statement... sorry to sound harsh... But you have to change the rear lines. It needs to be upgraded to a braided line that can attach to a caliper... Factory is a short U shaped rubber line that attaches from the body to the axle then from there it's a hard line to the wheel cylinder... you can't re-use that because you need to mount a flexible line to a caliper to allow it to move.

Duh! Sorry, let me rephrase, how about the hose going into those hard-lines? I am sure it is rated for well above the operating pressure, but it isn't necessarily designed for the higher pressure associated with the rear disc. Oh well, this is one of the upgrades I likely won't be worried about -the front brakes need upgrading long before I consider messing around with the rears.

In my photo the steel braided line is directly connected to the body line which is a solid steel line to the master. I'm confused on what "hose" you would be referring to or would even be left in the system for any reason. You can see the mounting point where the stock U shaped hose would have gone to on the axle and from that point it was a hard line again. From the body line to the new caliper is completely replace so all that is tossed.

This bias/master change is only needed by those who have done a RDB upgrade to increase the usage of the rear calipers, so if your wondering this because you're contemplating doing the master swap before rear disc that's just a waste of time and could quite possibly make your rear drums work very weird, never mind worrying about the hose supporting 900PSI.

[Rettax3]

In my photo the steel braided line is directly connected to the body line which is a solid steel line to the master. I'm confused on what "hose" you would be referring to or would even be left in the system for any reason. You can see the mounting point where the stock U shaped hose would have gone to on the axle and from that point it was a hard line again. From the body line to the new caliper is completely replace so all that is tossed.

This bias/master change is only needed by those who have done a RDB upgrade to increase the usage of the rear calipers, so if your wondering this because you're contemplating doing the master swap before rear disc that's just a waste of time and could quite possibly make your rear drums work very weird, never mind worrying about the hose supporting 900PSI.

Yep, I got the application of the Lumina MC from your earlier explanation.

It has a different bias setup for the disc/disc vs the disc/drum that a Beretta has.

I didn't realize your method completely removed all of the stock hydraulics past the body hard-line. I makes sense thinking about it though, but I guess I was thinking of the rear-brake hydraulics on the third-gen F-bodies (Camaros, Firebirds). I converted one of my Camaros to rear disc some years ago, and although the rear-axle hard-lines are a little different they are similar between the drum and disc, and both sides come into a 'tee' before connecting to the body hard-line via a hose. Seeing that you used braided hoses to the calipers on your car, I still had it in my head that they would connect to a stock fitting on the rear 'axle' of the Beretta, and use a stock hose to connect to the body, but with the Beretta's use of completely independent rear-brake lines, that doesn't make as much sense. Thank you for helping to clarify that for me.

[woody90gtz]

Yup, my Camaro has 3 braided hoses in back after my disc swap.

Here's what the 88-94 style looks like for the disc hose out back:

[3X00-Modified]

Very similar to my setup you just don't have the tube to run the line in like I did... It's nice having the line go into the rear axle then come out right behind the caliper.

Woody, did you chop your backing plate down to only fit around the e-brake drum part and leave the inside of the rotor visible?