I have all the parts to do the ATS Brembo fronts(mounting kit, calipers, slotted rotors, stainless lines, pads etc) and was wondering if there was an upgrade for rear besides rotors and pads...please keep us posted
I don't know if there's any difference in hydroboost vs vacuum boost master cylinders, is there?
I believe cpp sells hydroboost kits for street rods and custom applications, you might contact them. The booster they use looks identical to ours.
Hydraulic Brake Assist Systems
There's a discussion about this on another forum I'm on. The general consensus is that it would be ideal to change the master cylinder to keep the ratio between the pistons the same.Is there any danger posed by not upgrading the m/c? It seems like the amount of pedal travel needed to stop the car will increase. Does that mean that it won't have enough travel to fully stop the car in a panic situation?
Is there any danger posed by not upgrading the m/c? It seems like the amount of pedal travel needed to stop the car will increase. Does that mean that it won't have enough travel to fully stop the car in a panic situation?
Question I posed earlier was what is available in terms of oem hydroboost MCs to select from?
I can’t really help much there as I’m running vacuum booster brakes. But I calculated out I only needed to go 1/16” larger in MC bore with the ATS brembos and 43mm taurus rear calipers. That’s not a huge difference in MC bore size
@Mustang5L5 what size do you think you is needed?
Problem is I can't find accurate info as to what bore size goes to what year and brake setup. Plenty of info on the vaccum boosted setups, but for hydroboost the info just isn't available.
I also see two sizes listed. A 1" bore, and a 1 1/16" bore.
I *think* the GT with the larger front calipers (larger by way of dual 44.5mm pistons) used the 1 1/16" bore, and the cobra used the 1" bore. Unconfirmed though. SO really this is step one to ID years and bore sizes to what brake combo.
If that is the case, I would swap the cobra 1" to the 1 1/16" with the ATS and 43mm rear calipers. How easy is that to do? Unknown. Ford has a habit of swapping around fitting sizes to prevent MC mixup on the factory line. May not be a direct swap without adapters of some sort.
This is uncharted territory really. Someone's gotta be the first to try it and figure out what works and what doesn't. Seems like we are still brainstorming ideas to figure out a good, safe combo of parts to use here.
But for the vaccum boosted guys (94-95 cobra and fox guys), I think the ATS fronts, 43mm rears and a 94-95 1 1/16" bore MC is the combo to use and what I will be trying out on my car.
Problem is I can't find accurate info as to what bore size goes to what year and brake setup. Plenty of info on the vaccum boosted setups, but for hydroboost the info just isn't available.
I also see two sizes listed. A 1" bore, and a 1 1/16" bore.
I *think* the GT with the larger front calipers (larger by way of dual 44.5mm pistons) used the 1 1/16" bore, and the cobra used the 1" bore. Unconfirmed though. SO really this is step one to ID years and bore sizes to what brake combo.
If that is the case, I would swap the cobra 1" to the 1 1/16" with the ATS and 43mm rear calipers. How easy is that to do? Unknown. Ford has a habit of swapping around fitting sizes to prevent MC mixup on the factory line. May not be a direct swap without adapters of some sort.
This is uncharted territory really. Someone's gotta be the first to try it and figure out what works and what doesn't. Seems like we are still brainstorming ideas to figure out a good, safe combo of parts to use here.
But for the vaccum boosted guys (94-95 cobra and fox guys), I think the ATS fronts, 43mm rears and a 94-95 1 1/16" bore MC is the combo to use and what I will be trying out on my car.
Has anyone officially tried out the ATS front/43mm rear setup with oe booster?
One thing to keep in mind is pedal geometry changed slightly in 1996, so that plays a role. That’s why you can’t look at what I figured out for the vacuum brajes and apply it to hydroboost.
I think you need 1/16” more MC bore. But I’d hate to have someone buy a $400 aftermarket MC to try this out.
Sorry I am little confused here.
So are you saying that for us hydroboost guys you think we need a 1-1/8 master cylinder?
From what I've found on both rock auto and tasca ford websites all V8 cars use the same part number master cylinder that has a 1-1/16th bore. Adding another 1/16th would obviously take is to 1-1/8th which is aftermarket territory.
I'm unsure. I think so, but hydroboost is strange because when I owned my 2003GT, I installed 2003 Mach 1 front brakes, and never touched the MC. Car stopped great and I even autoXed that car and pushed those brakes hard. If the MC was "wrong", I never knew it and the car never showed it. The GT calipers were 20% larger than the Cobra versions and the MC handled that fine. Keep in mind, those 99-04 GT calipers are using 44.5mm pistons as well.
Hydroboost seems to be a lot more forgiving. Whereas the vacuum cars seem more sensitive. I've had a number of brake setups on my Fox and have changed the MC three times to compensate. Each time was 1/16" of a difference, and each time it made a HUGE difference in pedal feel and stroke.
So sorry if I seem rather incomplete, but I don't want to give out any info as "matter of fact" unless I am 100% it is in fact true. So in this case, I do not know. I am speculating.