rear disc conversion on my fast back

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sgtbromen

Well-known member
Joined
Jul 27, 2014
Messages
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Location
minnesota
My Car
1971 fast back grabber blue 351 4V
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?

 
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,

 
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

 
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.

 
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_library/Explorer8_8.shtml

 
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-mustang-rear-drum-brake-legend-series?filter_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-ford-11-inch-brake-kit?highlight=rear+drum

mustang7173 :D

 
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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/wheels-tires/28733-bolt-on-rear-disc-brake-conversion/

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)

 
Post: #10RE: What should I do about my brakes?

If you fellas are willing to humor me let me share what i did. This fits the 9" flanges dont know about the 8".

Go to pull a part and find a 98-2006 explorer. remove the axles and get the backing plates calipers and cables.

the plates are the same measurement up and down but front to back are .125 longer. I take my die grinder and deburr bit and slot the front of the back holes and back of the front holes and BOLT IT IN. No poop that is it. The discs are hat style and has a parking brake shoe setup inside that work great. Splice the cable, you will have to adapt the brake lines to the hoses but the hoses are standard 3/16 npt thread size.

so retain your lines up to where it goes to the drums, cut and reflare. Use 2 right side 2000 exploder rear brake hoses to connect the calipers. May hit smaller than 15" rims.

Use a 2000 v6 mustang master cylinder. its for 4 wheel disc and will never rust, fits same area as original and again you will have to flare 2 lines to send it to the block or use 2 unions.

your car will stop like never before....lotta work but if you are already doing brake stuff why not...

This is just my approach just trying to help if you think its stupid or too much work or dont believe that is all ok by me friends.

look at some of my pics and you will see how it looks on the car its in my library.

http://s1081.photobucket.com/user/Joepersad1/library/

 
This is just my approach just trying to help if you think its stupid or too much work or dont believe that is all ok by me friends.

look at some of my pics and you will see how it looks on the car its in my library.

http://s1081.photobucket.com/user/Joepersad1/library/
Not stupid at all - pretty ingenious if you ask me. ::thumb::

BTW - Beautiful car! ::thumb::

Couple of questions:

Classic Auto Air system? It looks like a Sanden compressor on a factory mount. Can you confirm? If so, how much of a PITA was that?

Autoloc or Electric Life power windows? I actually like the switch bezels - unlike the ones I got with my Autoloc kit(s).

How effective is the rear camera with such a small screen? (It looks like a back-up camera mirror to me)

 
Thanks Eric!

Classic auto air high effeicentcy condenser, sanden compressor, and evap core. Blows like ice and it was not hard to install, just took asome time shimming for belt alignment.

Ford f150 power windows from junk yard, costs 40 bucks or so. Find a pull a part and a f150 with power windows, cut out the regulators as they are riveted and orient them in your doors. They are a little fast but work great. You eill have to drill 1 hole but reulator housing holes line up.

That is a homelink mirror, remote garage door openers and compass and outside temp.

A 4R70W auto trans was my first mod and it snowballed from there to 100 other things.

Look at the red 69 conv in my library - we got carried away. It now sports 6 way power Corvette seats too.

You guys have to forgive me I came from the allfordmustangs site and some of those "individuals" still push a square boulder with a stick and Hate anyone who has the gumption to make their square rock round.

 
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Thanks Eric!

Classic auto air high effeicentcy condenser, sanden compressor, and evap core. Blows like ice and it was not hard to install, just took asome time shimming for belt alignment.

Ford f150 power windows from junk yard, costs 40 bucks or so. Find a pull a part and a f150 with power windows, cut out the regulators as they are riveted and orient them in your doors. They are a little fast but work great. You eill have to drill 1 hole but reulator housing holes line up.

That is a homelink mirror, remote garage door openers and compass and outside temp.

A 4R70W auto trans was my first mod and it snowballed from there to 100 other things.

Look at the red 69 conv in my library - we got carried away. It now sports 6 way power Corvette seats too.

You guys have to forgive me I came from the allfordmustangs site and some of those "individuals" still push a square boulder with a stick and Hate anyone who has the gumption to make their square rock round.
I love your car! Thanks for sharing!

Would love to hear more about all the mods. I never would have thought power windows from an F150 could work. Brilliant!

 
Post: #10RE: What should I do about my brakes?

If you fellas are willing to humor me let me share what i did. This fits the 9" flanges dont know about the 8".

Go to pull a part and find a 98-2006 explorer. remove the axles and get the backing plates calipers and cables.

the plates are the same measurement up and down but front to back are .125 longer. I take my die grinder and deburr bit and slot the front of the back holes and back of the front holes and BOLT IT IN. No poop that is it. The discs are hat style and has a parking brake shoe setup inside that work great. Splice the cable, you will have to adapt the brake lines to the hoses but the hoses are standard 3/16 npt thread size.

so retain your lines up to where it goes to the drums, cut and reflare. Use 2 right side 2000 exploder rear brake hoses to connect the calipers. May hit smaller than 15" rims.

Use a 2000 v6 mustang master cylinder. its for 4 wheel disc and will never rust, fits same area as original and again you will have to flare 2 lines to send it to the block or use 2 unions.

your car will stop like never before....lotta work but if you are already doing brake stuff why not...

This is just my approach just trying to help if you think its stupid or too much work or dont believe that is all ok by me friends.

look at some of my pics and you will see how it looks on the car its in my library.

http://s1081.photobucket.com/user/Joepersad1/library/
Thank you for sharing pics and advice, very nice car.

:p

Greetings from Belgium,

Eddy

 
Thank you all very much, different group of people here and its refreshing!

I went the explorer way and like you all was sick of a rusted MC with gunky fluid all the time. Nothing wrong with drum on the rear I just wanted to improve everything and 4 wheel disc just sounded ---hot. Ok I admit Ims a gearhead.

I looked online at the flange bolt patterns of ford axles and low and behold the explorer was so clos I had to try and it went off great.

I left the metering blocks in and went to the 2000 V6 mc which is aluminum with a plastic resivoir(which I forund out is for safety "ease of checking level") and the modulation is perfect. I use the same setup on the eleanor cars I build with no metering block and hydraboost with the saginaw PS pumps and with a simple adjustable valve on the rear line set at 50%. I use slotted and drilled rotors on those kits for the road race look.

Both the mustang and exploder MC are Aluminum and for 4 wheel disc so no residual valves are needed and the pedal is always up under your chin.

An easy alternative is to call Currie enterprises in calfornia and they sell the backingplate, loaded with new parking brake shoes installed and the attaching bolts for the flange for about 100 buck sper side. This is pretty cheap if you cnat find a vehicle in the junkyard or dont have time to hunt there. New rotors and calipers can be gotten at rockauto or any parts store..

If I can help please dont hesitate to ask

Joe



Post: #10RE: What should I do about my brakes?

If you fellas are willing to humor me let me share what i did. This fits the 9" flanges dont know about the 8".

Go to pull a part and find a 98-2006 explorer. remove the axles and get the backing plates calipers and cables.

the plates are the same measurement up and down but front to back are .125 longer. I take my die grinder and deburr bit and slot the front of the back holes and back of the front holes and BOLT IT IN. No poop that is it. The discs are hat style and has a parking brake shoe setup inside that work great. Splice the cable, you will have to adapt the brake lines to the hoses but the hoses are standard 3/16 npt thread size.

so retain your lines up to where it goes to the drums, cut and reflare. Use 2 right side 2000 exploder rear brake hoses to connect the calipers. May hit smaller than 15" rims.

Use a 2000 v6 mustang master cylinder. its for 4 wheel disc and will never rust, fits same area as original and again you will have to flare 2 lines to send it to the block or use 2 unions.

your car will stop like never before....lotta work but if you are already doing brake stuff why not...

This is just my approach just trying to help if you think its stupid or too much work or dont believe that is all ok by me friends.

look at some of my pics and you will see how it looks on the car its in my library.

http://s1081.photobucket.com/user/Joepersad1/library/
Thank you for sharing pics and advice, very nice car.

:p

Greetings from Belgium,

Eddy
Cant take credit for spotting the windows, my big brother spotted the similiarity when he was hunting for intermittent wiper relays from those trucks.

Roller cam 355C, roller rockers, Edelbrock Alum. heads MassfloEFI sequential port injection, PW, AC, PS, Power 4 wheel Disc, Built my own Ram AIr housing to fit massflo throttlebody, Power door locks, Holmelink Mirror, 4R70W 4 spd auto w/ lockup, TCI rear suspension with coil overs, 3.70 9" true trac posi, Helical strut rod bushings, roller front spring perches, Sound deadner entire cabin, Speedhut Electric gauges including custom inverted ones for the tripod under ac vents, Car was a strip to the guts wiring and all resto, HID headlights, Sequential LED tail lights, and a bunch of other little things like electric remote trunk relaease that worked with my alarm keyfob and had a dash mounted button. Automatic headlights(slick)...lotsa work but fun. This is the car that i developed my 4R70W crossmember install kit for..

 
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