Progress Thread 12th Owner: My '93 Notchback Restoration & Performance Build

Big size difference between the 4 cylinder brake booster and the '93 Cobra (Cardone) one.

Mustang5L5 said:

Just need to adjust the pedal rod. Pretty simple to do. Max motorsports has some writeups.

if you put your front wheels up and notice they are grabbing, loosen the two bolts on the MC enough to pull it away 1/4” or so and see if they free up.

Click to expand...

Any chance you can attach the link? I tried searching for it and don't find anything by MM other than manual brake pedal swap out articles, etc.

Finished the brake booster install today. Took me more time than anticipated and I ended up removing my driver's side seat, much of the lower dashboard below the steering wheel, the intake, clutch cable and the windshield wiper motor. I ended up cutting down the two bolts on the passenger's side of the booster and slotting the two passenger side holes. The booster slipped in with a little motivation. The most difficult part was figuring out why the brake switch would not work as before. It would stay upright causing the brake lights to stay on or too far downward and the brake lights would never come on. I ended up using the universal tool - a zip tie.

Overall the Cardone booster gives the car a more traditional and progressive brake pedal. Spongy at first with growing firmness and increased braking capacity as the pedal is pushed. The 4 cylinder booster was always rock hard. I'll have to get used to the new booster.

My car is still exhibiting the previously discussed hesitation at speed. To date I've replaced:
all 8 spark plugs, gapped at .55
all 8 spark plug wires
Oxygen sensors
Cap and rotor
Fuel filter
Coil.

Car idles fine with no surging and returns to idle fine when coming to a stop. MAF sensor was cleaned by me within the last week.. Timing is set at 10 degrees.

Today I ran an extension to my fuel pressure gauge and did not observe any wild swing in pressure while driving it. Pressure was consistent between 38-42 unless I accelerate hard. Then it goes up to 42-44'ish.

The car had a recent valve job so it's mechanically sound. I'm running out of ideas and don't really want to blindly keep throwing parts at it. Thoughts?