brake conversion, 1990 gtu - 4 piston
02-20-06, 04:17 PM
#1
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brake conversion, 1990 gtu - 4 piston
hey
quick question, ( yea I searched )
I have a 1990 gtu 5 lug with single piston calipers,
Now I know the rear is the solid rotors, but what is the difference on the front?
All that I could tell diff from my 87 gxl to my 90 gtu, was the caliper and the brake line,
I plan on converting them to the 4 pot calipers, and hopefully vented rear also ,
What all would I need?
The only topics I could find were about converting from 4 lug,
Would I just need the calipers and rotors?
My current calipers are sticking and I need new rotors So I plan on just converting as long as I don't have to like swap out anything crazy,
so... waht all is needed
thanx in advance
matt-
quick question, ( yea I searched )
I have a 1990 gtu 5 lug with single piston calipers,
Now I know the rear is the solid rotors, but what is the difference on the front?
All that I could tell diff from my 87 gxl to my 90 gtu, was the caliper and the brake line,
I plan on converting them to the 4 pot calipers, and hopefully vented rear also ,
What all would I need?
The only topics I could find were about converting from 4 lug,
Would I just need the calipers and rotors?
My current calipers are sticking and I need new rotors So I plan on just converting as long as I don't have to like swap out anything crazy,
so... waht all is needed
thanx in advance
matt-
02-20-06, 05:03 PM
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grrrr
OK for the fronts, all you would need to change is the 4pot calipers and the brake lines. For the rears you need to pull the vented rotor and the caliper also. The caliper that comes with vented rear discs are bigger than the calipers on the solid discs.
Just for future reference:
The above info is respects to the thread starter's car, 4 luggers, please continue your search
OK for the fronts, all you would need to change is the 4pot calipers and the brake lines. For the rears you need to pull the vented rotor and the caliper also. The caliper that comes with vented rear discs are bigger than the calipers on the solid discs.
Just for future reference:
The above info is respects to the thread starter's car, 4 luggers, please continue your search
Last edited by kungfuroy; 02-20-06 at 05:05 PM.
02-20-06, 05:57 PM
#6
Originally Posted by kungfuroy
grrrr
OK for the fronts, all you would need to change is the 4pot calipers and the brake lines. For the rears you need to pull the vented rotor and the caliper also. The caliper that comes with vented rear discs are bigger than the calipers on the solid discs.
Just for future reference:
The above info is respects to the thread starter's car, 4 luggers, please continue your search
OK for the fronts, all you would need to change is the 4pot calipers and the brake lines. For the rears you need to pull the vented rotor and the caliper also. The caliper that comes with vented rear discs are bigger than the calipers on the solid discs.
Just for future reference:
The above info is respects to the thread starter's car, 4 luggers, please continue your search
02-20-06, 06:16 PM
#7
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Originally Posted by RevUp13b
Does that mean the rear brake pads are different (Vented and non-vented??
The reason the calipers are different is becuase the vented rear disc is thicker than the solid rear disc.
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02-21-06, 05:21 PM
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Does anyone know wether the rear brakes on the 88 Turbo II are?
the goodridge lines have them listed as:
Solid Rear Disc or Sport Suspension.
I don't wanna buy the wrong ones, anyone have an idea?
the goodridge lines have them listed as:
Solid Rear Disc or Sport Suspension.
I don't wanna buy the wrong ones, anyone have an idea?
02-21-06, 11:08 PM
#16
Most people overlook a very important part of the conversion. The cars with 4 piston calipers have bigger brake boosters than the single piston cars. Yes you can still stop with the smaller booster but it's not as easy. Swap the booster, master cylinder, and proportioning valve. That's different too.
02-21-06, 11:19 PM
#17
Passing life by
All 4 pistons FC's had sport suspension. The classification in the books at auto parts stores is sport or non and sport refers to 4piston vented system.
He needs more then just the calipers and pads. The vented rears will not fit he needs the hub assembly as well. I do not know about mounting the 4piston to the 1piston front hub bolt pattern it may work but then you will have two 4 lug wheels and two 5 lug wheels. So basically you need the hubs and rotors and calipers and booster and distribution and master cylinder.
He needs more then just the calipers and pads. The vented rears will not fit he needs the hub assembly as well. I do not know about mounting the 4piston to the 1piston front hub bolt pattern it may work but then you will have two 4 lug wheels and two 5 lug wheels. So basically you need the hubs and rotors and calipers and booster and distribution and master cylinder.
Last edited by iceblue; 02-21-06 at 11:25 PM.
02-22-06, 07:31 AM
#18
Originally Posted by rotarygod
Most people overlook a very important part of the conversion. The cars with 4 piston calipers have bigger brake boosters than the single piston cars. Yes you can still stop with the smaller booster but it's not as easy. Swap the booster, master cylinder, and proportioning valve. That's different too.
My question is this: Is it worth doing the conversion without changing the MC and booster? I have all the parts, except for those 2 items, sitting on my bench awaiting motivation and if the conversion will not provide a noticable improvement in stoping/staying power I may hold off until I can get those parts. TIA
02-22-06, 08:16 AM
#19
Another related question: It's my understanding that some S5 versions other than the TII came with the 4-pot system. So if that is correct, one would have to conclude, based on the parts catalog breakdown, that those versions used the non-turbo MC and booster. Can someone confirm that for me? TIA
02-22-06, 11:09 AM
#21
He who smokes bitches
Originally Posted by Go48
Another related question: It's my understanding that some S5 versions other than the TII came with the 4-pot system. So if that is correct, one would have to conclude, based on the parts catalog breakdown, that those versions used the non-turbo MC and booster. Can someone confirm that for me? TIA
02-22-06, 05:57 PM
#22
Originally Posted by cool_as_crap
yeah, the 89-90 gxl, as well as the 89-90 gtuS came with the 4-pot. dont know about the 89-90 gtu though
02-22-06, 06:07 PM
#24
Originally Posted by rotarygod
It's easier to just pull off the master cylinder, booster, and proportioning valve all as one assembly which is why I mention the proportioning valve. It makes things very simple this way.
Talked to my nephew today who instructs at local high-speed track schools. He did the conversion on his NA 2nd gen w/o changing the MC and booster, and he feels that there was a definite improvement in braking and that this conversion was more than adequate for high-speed driving events.
02-22-06, 06:42 PM
#25
i would agree with him, i dont delivery food in the rex anymore, so i am not on the brakes as much but i did the front caliper switch back in july and have had not trouble at all. also fsm is confusing when it comes to all the mc and booster, the lines to the proportioner are the same, the turbos came with bigger boosters, but unless you are making a track car the difference will not be to much as compared to the switch to 4 pots.