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rear disc conversion on my fast back
#1
i am looking at getting a rear disc conversion kit for my 71 fastback but none of the kits from summit come with the backing plates does anyone know where i can get disc backing plates or know of a kit with them included? also i need a new brake booster and master cylinder can i just get a stock replacement /will it work with rear discs or do i need an aftermarket booster and master cylinder?
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#2
I was looking at getting a kit like this when I get to that part.

http://www.ebay.com/itm/251615955814?ssP...1423.l2649
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#3
sgtbromen;192713 Wrote:i am looking at getting a rear disc conversion kit for my 71 fastback but none of the kits from summit come with the backing plates does anyone know where i can get disc backing plates or know of a kit with them included? also i need a new brake booster and master cylinder can i just get a stock replacement /will it work with rear discs or do i need an aftermarket booster and master cylinder?

You will need to get a disk/disk proportioning valve for the back disks to work properly, the rest should be fine,

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

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#4
If the MC is disc/drum there is a residual valve under the brass flare insert at the output from the rear brake reservoir. It will need to be removed to use discs in the rear. You may want to contact this guy. http://www.discbrakeswap.com

Chuck
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#5
Also-before you commit to a particular set up you need to consider your wheels. My conversion will not fit most 15" wheels with proper backspacing. If you plan on upgrading the wheels and tires, it isn't a problem, but if you intend to go drag racing, be aware tire choices become very limited )and expensive) outside of the 15 inch wheel size.

I went with Baer's Ironsport setup and ended up using a Wildwood 1 1/8th Master cylinder along with a proportioning valve for the rear to be able to dial in some bias. The whole system works very well now, but the emergency/parking brake was very problematic to get adjusted and I ended up using a lokar tunnel mount brake.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#6
Or do what I did and put in a 8.8 rearend out of a explorer. Disc brakes, posi, and 373 gears in 1 shot. And all ford parts.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#7
turtle5353;192818 Wrote:Or do what I did and put in a 8.8 rearend out of a explorer. Disc brakes, posi, and 373 gears in 1 shot. And all ford parts.

So, what years of Explorers are good for this?
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#8
MustangMyWay;196386 Wrote:
turtle5353;192818 Wrote:Or do what I did and put in a 8.8 rearend out of a explorer. Disc brakes, posi, and 373 gears in 1 shot. And all ford parts.

So, what years of Explorers are good for this?

If you want the disc brakes the 95 and up explorers all came with disc brakes and most had 373 gears and posi from the factory. They also came with 31 splines axles. So they are pretty tough. There is a good bit of info about the 8.8 on the ranger station. Heres a link to the page, check it out and let me know if you have any other questions. It was a pretty easy swap if you have some fab skills.
http://www.therangerstation.com/tech_lib...r8_8.shtml

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#9
Wrench 
sgtbromen,

First, thank you for your service to our country!! Second, Yes, You can use stock replacement boosters. I would recommend going to Master Power Brakes FAQ section to read up on the Master Brake Cylinders. The state that the master cylinder bore has a lot to do with the performance and pressure of your braking system. The also recommend to use a new, not manufactured M/C due to possible re-boring of the cylinder. Also, you will need to change out the proportioning valve to adjust to the new rear disc brakes.


Master Power Brakes FAQ

http://www.mpbrakes.com/reference-faqs

Take a look at the kit from E-bay. This might be what you are looking for.

8" 9" Ford - 11" Rear Disc Brake Kit w/ Parking Brake 5 Lug -M-2300-G Small Ford Disc Brakes - Explorer - Small Ford Ends

http://www.ebay.com/itm/like/370719652867?lpid=82

Another solution to look at is the large 11 inch big Ford Brake drums. I have these on my 1973 Coupe and they are huge. Direct bolt on-

1973 Ford Mustang Rear Drum Brake - Legend Series

http://www.mpbrakes.com/1973-ford-mustan...ilter_name=

Good Luck and keep us posted on what solution you go with.

Here is my thread on the Master Power Big Ford 11 inch brake drums on a 9 inch rear end.

http://www.7173mustangs.com/thread-big-f...=rear+drum

mustang7173 Big Grin
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#10
turtle5353;192818 Wrote:Or do what I did and put in a 8.8 rearend out of a explorer. Disc brakes, posi, and 373 gears in 1 shot. And all ford parts.

My understanding is that the caliper bracket will bolt right onto the 9" (axle flange bolt pattern is the same) with some modification to the lower "rounded" portion of the flange - basically, 'flatten' it out so it looks the same as the top, and everything that works on the 8.8" will now work with the 9". Picture #6 in the following article shows what I'm talking about.

http://www.mustangandfords.com/how-to/wh...onversion/

The above article talks about using a "big bearing" axle kit with 5x5" lug-pattern axles and having to replace the axle ends & axles for "small bearing" axles with 5x4.5" lug-pattern (same as the 8.8") - our cars came with the "small bearing," 5x4.5" axles - so it should pretty much be a bolt-on experience (e-brake cable considerations aside, of course)

Eric

[Image: mach1sig2.gif]
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