Brakes system upgrade
01-14-2016, 12:01 PM
#1
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Brakes system upgrade
I had my 928 S4 repainted last month, and now I'm looking to upgrade the wheels and the braking system.
Carrera III 18" and 3.6 DESIGN 18" VELOCE ALLOY WHEELS are what I have in mind so far.
Does anyone have experiences what types of 911 calipers can I choice?
Thx
Carrera III 18" and 3.6 DESIGN 18" VELOCE ALLOY WHEELS are what I have in mind so far.
Does anyone have experiences what types of 911 calipers can I choice?
Thx
01-14-2016, 12:12 PM
#3
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The 993TT front calipers are a direct bolt on. Same caliper as the GTS big blacks. With the 993 Calipers you do have to switch the crossover pipe but that's a 10 minute job. For the rears the only upgrade I'm aware off is the 993TT rear caliper but they must be machined (6mm) off of the mounting surface to let the rotor center on the caliper. Of course both upgrades require new rotors, pads, etc. Not a cheap upgrade and very little improvement in the overall braking, but it does help fill in the space in 18" wheels.
01-14-2016, 12:18 PM
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The 993TT front calipers are a direct bolt on. Same caliper as the GTS big blacks. With the 993 Calipers you do have to switch the crossover pipe but that's a 10 minute job. For the rears the only upgrade I'm aware off is the 993TT rear caliper but they must be machined (6mm) off of the mounting surface to let the rotor center on the caliper. Of course both upgrades require new rotors, pads, etc. Not a cheap upgrade and very little improvement in the overall braking, but it does help fill in the space in 18" wheels.
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Mrmerlin (04-10-2024)
01-14-2016, 12:34 PM
#7
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Whereas the GTS caliper route is an obvious upgrade, have you consider upgrading the pads?
If you are upgrading the wheels are you going to wider rubber? The S4 brakes are pretty good and unless you are going to wider rubber not sure I see a need for more front brake other than pads.
For the rears have you considered trying the 33 barg modulator? There is also a higher pressure one than that I seem to remember.
With new calipers you need new rotors, pads etc etc. Not trying to put you off rather more a case of ensuring you understand/consider the range of possible options.
Rgds
Fred
If you are upgrading the wheels are you going to wider rubber? The S4 brakes are pretty good and unless you are going to wider rubber not sure I see a need for more front brake other than pads.
For the rears have you considered trying the 33 barg modulator? There is also a higher pressure one than that I seem to remember.
With new calipers you need new rotors, pads etc etc. Not trying to put you off rather more a case of ensuring you understand/consider the range of possible options.
Rgds
Fred
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01-14-2016, 12:40 PM
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Whereas the GTS caliper route is an obvious upgrade, have you consider upgrading the pads?
If you are upgrading the wheels are you going to wider rubber? The S4 brakes are pretty good and unless you are going to wider rubber not sure I see a need for more front brake other than pads.
For the rears have you considered trying the 33 barg modulator? There is also a higher pressure one than that I seem to remember.
With new calipers you need new rotors, pads etc etc. Not trying to put you off rather more a case of ensuring you understand/consider the range of possible options.
Rgds
Fred
If you are upgrading the wheels are you going to wider rubber? The S4 brakes are pretty good and unless you are going to wider rubber not sure I see a need for more front brake other than pads.
For the rears have you considered trying the 33 barg modulator? There is also a higher pressure one than that I seem to remember.
With new calipers you need new rotors, pads etc etc. Not trying to put you off rather more a case of ensuring you understand/consider the range of possible options.
Rgds
Fred
If I upgraded my wheels, yeh I think I will wider the rubber too.
Don't think 245's gonna fit in Carrera III rear. I'm thinking maybe 265 or 275.
Thanks for the tip, Fred
01-14-2016, 12:53 PM
#9
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Many folks start looking at 'upgrades' to help with braking. Others do it for appearance. If you feel the need to fill the larger wheels more completely, the GTS calipers and rotors will help a little. Ditto with the braking help and the GTS calipers and rotors, but for US street driving there will be no difference.
Like many systems on the cars, braking performance deteriorates slowly as the cars and the braking parts age and wear. So before you go spending on GTS or Turbo-S pieces, look hard at the condition of what you have now. New rotors, caliper refurb and rebuild if necessary, new brake hoses and a thorough flush and bleed will work wonders when new modern pads are included. Bed the pads properly of course if you want the best braking performance; modern pads have different break-in requirements than what came on the car, so read and follow the instructions that come with the pads.
Bigger rear brakes for better performance are pretty much a waste of money, since rear system pressure is limited by the original bias valve. That valve is easy to change, with several options that allow the rear brakes to participate more. It's relatively easy to change, and a good option with modern tires and a working ABS system.
Like many systems on the cars, braking performance deteriorates slowly as the cars and the braking parts age and wear. So before you go spending on GTS or Turbo-S pieces, look hard at the condition of what you have now. New rotors, caliper refurb and rebuild if necessary, new brake hoses and a thorough flush and bleed will work wonders when new modern pads are included. Bed the pads properly of course if you want the best braking performance; modern pads have different break-in requirements than what came on the car, so read and follow the instructions that come with the pads.
Bigger rear brakes for better performance are pretty much a waste of money, since rear system pressure is limited by the original bias valve. That valve is easy to change, with several options that allow the rear brakes to participate more. It's relatively easy to change, and a good option with modern tires and a working ABS system.
01-14-2016, 01:03 PM
#10
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Front with 18 inch turbo twists and Bridgestone S-04 235/40 rubber
Rears - 18 inch with 285/35 Bridgestone S-04 Pole Position rubber
01-14-2016, 09:47 PM
#11
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cheapest upgrade. longer caliper mount bolts, 1/3" spacer washer and GTS rotors.
it works, its cheap and its as effective as the GTS system for all practical purposes.
it works, its cheap and its as effective as the GTS system for all practical purposes.
01-14-2016, 10:11 PM
#13
then there are also the Ferrari F50 front upgrades from Brembo....
01-14-2016, 10:21 PM
#14
Rennlist Member
Many folks start looking at 'upgrades' to help with braking. Others do it for appearance. If you feel the need to fill the larger wheels more completely, the GTS calipers and rotors will help a little. Ditto with the braking help and the GTS calipers and rotors, but for US street driving there will be no difference.
Like many systems on the cars, braking performance deteriorates slowly as the cars and the braking parts age and wear. So before you go spending on GTS or Turbo-S pieces, look hard at the condition of what you have now. New rotors, caliper refurb and rebuild if necessary, new brake hoses and a thorough flush and bleed will work wonders when new modern pads are included. Bed the pads properly of course if you want the best braking performance; modern pads have different break-in requirements than what came on the car, so read and follow the instructions that come with the pads.
Bigger rear brakes for better performance are pretty much a waste of money, since rear system pressure is limited by the original bias valve. That valve is easy to change, with several options that allow the rear brakes to participate more. It's relatively easy to change, and a good option with modern tires and a working ABS system.
Like many systems on the cars, braking performance deteriorates slowly as the cars and the braking parts age and wear. So before you go spending on GTS or Turbo-S pieces, look hard at the condition of what you have now. New rotors, caliper refurb and rebuild if necessary, new brake hoses and a thorough flush and bleed will work wonders when new modern pads are included. Bed the pads properly of course if you want the best braking performance; modern pads have different break-in requirements than what came on the car, so read and follow the instructions that come with the pads.
Bigger rear brakes for better performance are pretty much a waste of money, since rear system pressure is limited by the original bias valve. That valve is easy to change, with several options that allow the rear brakes to participate more. It's relatively easy to change, and a good option with modern tires and a working ABS system.
Fully agree with Doc Bob's comments
01-14-2016, 10:48 PM
#15
Rennlist Member
993 C2 rear calipers are actually a direct bolt on for S4+ cars and offer 20% larger pistons than the 928 S4 rear calipers.
I run them on the back of my 81 with some washers as spacers ( need the washers for all rear brake upgrades on 86- cars).
I run them on the back of my 81 with some washers as spacers ( need the washers for all rear brake upgrades on 86- cars).