ID89GT
10 Year Member
Well if his rear axles are aftermarket already then just sell them and use the money towards some 5 lug ones
Slotted & drilled Rotors for 89 Lx drag car. Are they worth it?
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Shaolin Crane
Banned
I dont think that so much is the problem, its bringing it to 120+(I know ive hit upwards of 130)The SLAMMING on the brakes, then bringing it back up to speed, then hitting them again, etc etc. Thats where the holes start to **** you over
FWIW, I had drilled front rotors on my car back when it was 4 lug and they cracked. That was with normal street driving, it NEVER saw the racetrack back then on those brakes.
My car has slotted rotors on it now, and the only reason I did that was because, at the time, they were the only Cobra rotors I could find with the anti-corrosion coating on them. If I could have found plain rotors with the coating, I would have went with those.
I think it would be more worth your time and money to focus on upgrading the front brakes first.
SSBC offers this front brake kit, which uses a stock size rotor, but upgrades you to a bigger caliper. Actually, this may be similar to the SVO setup- maybe someone with some more knowledge of the 73mm caliper can chime in here. There might be a cheaper way to piece together similar parts...
1987-93 Mustang 5.0L Front 4-Lug 11" Big Brake Kit by SSBC at LRS - Same Day Shipping!
My car has slotted rotors on it now, and the only reason I did that was because, at the time, they were the only Cobra rotors I could find with the anti-corrosion coating on them. If I could have found plain rotors with the coating, I would have went with those.
I think it would be more worth your time and money to focus on upgrading the front brakes first.
SSBC offers this front brake kit, which uses a stock size rotor, but upgrades you to a bigger caliper. Actually, this may be similar to the SVO setup- maybe someone with some more knowledge of the 73mm caliper can chime in here. There might be a cheaper way to piece together similar parts...
1987-93 Mustang 5.0L Front 4-Lug 11" Big Brake Kit by SSBC at LRS - Same Day Shipping!
this kit says it has everything you need to go 5 lug but i dont see calipers. does this kit limit you to stock calipers only? can the stock caliper be swaped with the 73mm one? if so maybe he could just put a booster on and some upgraded calipers
1987-93 Mustang Complete 5-Lug Conversion Kit With 28 Spline Rear Axles by 50resto at LRS - Same Day Shipping!
1987-93 Mustang Complete 5-Lug Conversion Kit With 28 Spline Rear Axles by 50resto at LRS - Same Day Shipping!
Yes, they are a direct swap.
The issue with the swap is that there is no correct MC for those calipers. You really need a 7/8" bore (22mm) MC instead of the factory 21mm (the cobra 15/16" MC might work too (24mm)
Without the MC, the pedal stroke will be longer and the feel will be softer. Would it offer more clamping force? Yes, if you don't run out of stroke
FWIW...i have run the 73mm front calipers with stock MC before.
HotFox
15 Year Member
I have a similar set up and can relate to your concern in going to 5 lug. I have 17x9, two sets of 15x8 and skinnies all 4 lug. I bought my car with 4 lug and like you do not plan to change. One thing the previous owner did was add Mark VII 73mm front calipers. I know they are Mark MII calipers because the logo is cast right into the caliper. I assume that it is the same rotor diameter, but not sure if anything else was changed to accept these calipers.
My car is also manual brakes, I keep a close eye on the rear drums and jack it up often and adjust the shoes to make sure they are doing their fair share of the braking. I know that on the street in a panic stop I would probably not be able to stop in time if put in that situation but do less the 700 miles a year of street driving and keep my distance in traffic. For me in the future I would like to add rear disc which I think would help a lot and eliminate the adjustments and the drum fade from hot lapping at the strip.
Scott
My car is also manual brakes, I keep a close eye on the rear drums and jack it up often and adjust the shoes to make sure they are doing their fair share of the braking. I know that on the street in a panic stop I would probably not be able to stop in time if put in that situation but do less the 700 miles a year of street driving and keep my distance in traffic. For me in the future I would like to add rear disc which I think would help a lot and eliminate the adjustments and the drum fade from hot lapping at the strip.
Scott
Nope. Early Foxes used a 7/8" bore MC with manual brakes...but with revised pedal arm geometry as well.
Prob is...it's a PITA to plumb in. 7/16-24 and 1/2-20 are the port thread sizes. Weatherhead might make adapters. not sure
Prob is...it's a PITA to plumb in. 7/16-24 and 1/2-20 are the port thread sizes. Weatherhead might make adapters. not sure
Im running mark 8 calipers up front, svo drilled and slotted ebay rotors in the front and a GT rear setup with R-1 concepts rotors. This setup was pretty cheap(under a grand) and the car stops well from 120+ at the dragstrip and does well on the street too
Aerospace Brakes are the ticket
Once your Mustang regularly tops 130 mph in the 1/4 mile it's time to upgrade the cars brakes. Aerospace Components, located in Florida, makes a 4 wheel disc brake kit for the Fox-body Mustang that installs easily, reduces vehicle unsprung weight and greatly reduces stopping distance. I used to stop my Mustang by putting one foot on top of the other and pushing really hard, while praying I didn't run out of shutdown area. The Aerospace parts are top quality, and reasonably priced. They even include instructions on how to modify your brake pedal to increase leverage.
To find out more about drag racing your 5.0 liter Mustang check out my blog by clicking here
2010 August | Best Racing Tips Win at the Dragstrip
Once your Mustang regularly tops 130 mph in the 1/4 mile it's time to upgrade the cars brakes. Aerospace Components, located in Florida, makes a 4 wheel disc brake kit for the Fox-body Mustang that installs easily, reduces vehicle unsprung weight and greatly reduces stopping distance. I used to stop my Mustang by putting one foot on top of the other and pushing really hard, while praying I didn't run out of shutdown area. The Aerospace parts are top quality, and reasonably priced. They even include instructions on how to modify your brake pedal to increase leverage.
To find out more about drag racing your 5.0 liter Mustang check out my blog by clicking here
2010 August | Best Racing Tips Win at the Dragstrip
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Shaolin Crane
Banned
Nahhhh, just gotta know how to use a brake flair tool
Still makes me
that you cant seem to use one, you being the anal retentive perfectionist that you are, i guess i can finally say i topped you on something 
Nahhhh, just gotta know how to use a brake flair tool
Still makes me
I couldn't get that **** figured out either, I ended up going to a brake shop and having them flare it for me. I think it has a LOT to do with the flare tool that you use, mine was a junk Auto Zone rental. Not going to pay a lot of money for something that I might use once or twice in my life.
Shaolin Crane
Banned
Mine was one from autozone as well 
But i like buying tools, never know when i might need it again or do a job.
Ha, i have the engineers beat
But i like buying tools, never know when i might need it again or do a job.
Ha, i have the engineers beat
Ha, i have the engineers beat
Haha, OR, you have brake line junctions that are ticking time bombs.
I was able to get it to "work", but I was not confident at all with it. So I took it to a pro shop, and had them do it.
Shaolin Crane
Banned
I have the crappy Autozone one...and it blows goats.
I think the Sears one is much better quality, but before spending $60 on it, i just got the $10 in adapters and called it a day
I think the Sears one is much better quality, but before spending $60 on it, i just got the $10 in adapters and called it a day
Shaolin Crane
Banned
Just gotta make sure you cut the line clean, and use a file on the inner portion of the brake line. Then wrench it down slowly, little grease helps too.
bentley429isBAC
10 Year Member
Strange, Wilwood, Aerospace. Pick one, they are in order better to worse. Also by price. Do all 4 corners will run you under $1500 max, saves roughly 60 lbs and you'll run about .2 faster with no other changes from losing so much rotating mass.
So can I just go to autozone or advance and buy mark VII calipers and they will work on my car with some slight modifications im sure. I was also considering putting turbo coupe rear discs on the rear. Could I go to autozone and buy them too and theyll work?
