Two manual brake conversion questions???
 

I have been searching online trying to find this piece? I can't find it offered without the master though. I'm looking for just the adapter http://www.summitracing.com/parts/BMR-MBK001/?rtype=10

Also what would be the appropriate bore size for manual? 14" z06 up front, factory disc rear end with pbr calipers. Thank you!

Have you called BMR? When it doubt, I'd suggest calling the supplier directly since what Summit sells may not indicate what BMR will or will not sell. What's the application? Are you sure you even need an adapter? For that kind of money you can buy a Universal Wilwood unit in 7/8, 1, or 1-1/8 inch bore sizes.

As for the master cylinder, that would depend on what rear brakes you're running. Factory disc brake from what? Super Duty? Or should we assume LT1 or LS1 F-body, C5, C6, etc? All of the latter are fairly comparable hydraulically speaking with 45mm pistons, so we would normally suggest a 7/8" to 15/16" bore master cylinder with a slightly more aggressive pad in a manual installation.

HTH,
Tobin
KORE3

Hey Tobin, i just purchased 3rd gen f body hubs from you about a month ago. It's an 82 z28. The car has a 9 bolt rear end with the pbr calipers i believe it is an 11 inch rotor.
Unless wilwood makes a master that will bolt up to my firewall/pedals which was originally vacuum assist, then yes i will need some sort of adapter.

Mike, I did a little digging and found some pertinent information over on third-gen.org. It's mostly a DIY type of thing, although it looks like the name Ed Quay,Burkhart and Smith Performance keep popping up along with a few home brew type setups to keep things interesting. I've linked to a couple of threads that caught my eye, however there are numerous others as well if you want to keep digging.

http://www.thirdgen.org/techboard/or...l?ref=esp-link

http://www.thirdgen.org/techboard/su...l?ref=esp-link

There seems to be a fair amount of misinformation about brakes in general, so take whatever you read with a grain of salt.

Tobin
KORE3

Thank you for posting those links. I would like to run the 7/8" wilwood master instead of the master that comes with those kits. I believe all of those are 1" or bigger. I'm going to call a few of these places tomorrow and see if they will sell just the adapter.

The master cylinders shown in those links with the aluminum body and black plastic reservoirs are actually OE Mopar units and can be found in a variety of configurations and bore sizes including 7/8", 15/16" [24mm], 1.06", etc. They were supplied on numerous Dodge/Plymouth/Chrysler applications from the early 80's through the 90's IIRC.

The ones i've seen offered with the firewall adapter were 1.06 or bigger.

And? Be wary of any company that wants to sell you any master cylinder without first asking you what you're running for brakes as the master cylinder bore size should be matched to the caliper piston area, pedal ratio and application (manual, power, hydro, etc) just for starters.

Most of the manual conversions that I've seen seem to be geared towards drag racers concerned about weight who have huge duration camshafts and therefore no vacuum. Drag cars are not particularly known for their brakes (at least not in a good way IMO) and function is regularly sacrified for weight in order to optimize straight line performance. The 1.06" master cylinder probably works fine for the application it was intended for...but that's not to say that it will work well for all applications.

HTH,
Tobin
KORE3

All im saying is that I haven't seen any companies offering this adapter with a 7/8" master. I'm not saying that they aren't made. I called bmr and one other company that makes these kits and they both don't offer the adapter alone.

Call Midwest Chassis (good guys) or Burkhart Chassis and tell them what you are doing, they may sell the adapter by itself, or may be able to get you a different size master as well

http://www.midwestchassis.com/products.html 309-382-6252

http://burkhartchassis.com/id84.html 217-855-8660