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Mustang II Master Cylinder + Rear Versailles brakes = little rear brakes
Hey Guys. DV I hope you can help me here. I have a CR with Wilwood 4 piston calipers in front and a 9 inch ford with disc brakes out of a Versailles. Car stops ok, but bias is way too high towards the front. The rears are hardly getting any heat in them. Is the power brake booster and master cylinder from the mustang II not compatible with rear disc brakes? I could plumb a proportioning valve in the front brakes, but this would just be a band aid. Any ideas?
Curt |
cURT: JUST A THOUGHT....MUSTANG II HAD REAR DRUMS AND WAS LIGHTER THAN GRANADA/VERSALLES WITH DISC REARS. THE VACUUM BOOSTER ON THE GRANADA/VERSALLES MAY HAVE BEEN LARGER DIAMETER TO EFFECT HIGHER LINE PRESSURE FOR REAR DISCS(?)
RICK |
I'm sure the Mustang II master is to small for the rear brakes. I would go to a Corvette or Mustang GT master with equal size reservoirs. You may need to install a prop valve in the rear to reduce the pressure after the new master. I use a NAPA # 36367 master. You will need to elongate the mounting holes to get it to fit the Mustang II booster. You will also need to adjust the rod between the booster and master, the tip does screw in and out for adjustment. You should have 1/16" between the 2. I usually adjust the rod so it contacts the master when installed then back the rod off.
Don |
Why repeat what Don says?
Says it all! :) DV |
Don Scott, You the Man... So the Napa Master, is that a GT or a Vette master? Also, can you elaborate on the elongation comment? I need longer bolts, or drill holes deeper? Thanks a lot, sounds like I will have some real braking rather quick.
Curt |
Sorry, The NAPA # is the Vette. The mounting holes are elongated to each side of the master. Basically you are making the holes look like a slot. I use a small die grinder.
Don |
OK Gentlemen, I purchased the corvette MC from Napa (36367). Which compartment goes to the front brakes / rear brakes? The front part of the MC (furthest from the booster) appears to have a little more capacity than the rear. Also, the MC came with a large black nipple type seal. How does this piece go onto the MC or booster? Also, what about the brake pressure differential control valve? I have no clue what type is in the car. Could this be causing the problem as well? Should I just replace this piece while I am doing the MC? If so which one should I get?
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Curt,
On the GM master the front bowl is for the front brakes, (Ford is just the opposite). I eliminate the boot that you are referring to, and as the "differential valve or porportioning vlave, we simply use an adjustable valve, (Wildwood available from Jegs for $49.00) We normally come out of the rear bowl, to the fire wall, up high, to the valve, then to the rear brakes. Simple clean and easily accessible. See if Don concurs. DV |
Yep, I agree!
Don |
Gentlemen,
I works...Works very well. Cant wait to get back on the track. I can now go a lot faster because the car will brake properly. Thanks for the help. Curt |
Queston? For DV or Dscott.
On the MustangII MC which bowl is for the front and which is for the rear? (The small bowl and the large bowl).
Thanks. Snake. |
Snake,
Ford... Front bowl goes to the rear, rear bowl goes to the front. DV |
DV
Ok...let me get this right....the small bowl is for the rear and the larger bowl is for the front.
Snake. |
Steve,
You are correct with respect to the Ford Mustang II MC. The vette mc I installed is reverse |
Don,
I was cross referencing your Napa number 36367 with A1 Cardone and Bendix numbers at Checker. That Napa number comes back as a master cylinder for manual brakes. They listed some different part numbers for 1976 Corvette master cylinders for power brakes that cross reference back to a Napa #39018. The Napa website has the 36367 listed for manual and the 39018 for power too. I was doing it on the computer so I can't see what any differences are. Just wondering if there were reasons why you use the manual Corvette master with the MII booster instead of the power Corvette master. Also, Checker has the remanufactured A1 Cardone and Bendix Corvette master cylinders for $15 to $30 with $5 to $10 core charges. You can find them at www.partsamerica.com. A lot cheaper than the Napa one For $90, but maybe comparatively the're junk. Anybody used any of the remanufactured ones with good luck?? Wade |
I never looked at the application for the master. I just found the one I wanted in the book and used it. Most of the manual brake masters have a rod attached to go from the master to the pedal. The power brake booster has this rod already. The 36367 master does not have the rod and it matches the Mustang II booster with a little modification. It shouldn't matter which master is used if the attachment is the same.
Don |
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