GTS Rear Brake Calipers
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Hi
Can anyone here confirm that I can bolt GTS rear brake calipers [928.352.421.03 & 928.352.422.03] onto my S2 rear hubs?
I also want to use S4 rotors with this set up.
Will I face any alignment problems.?
Thanks.
Can anyone here confirm that I can bolt GTS rear brake calipers [928.352.421.03 & 928.352.422.03] onto my S2 rear hubs?
I also want to use S4 rotors with this set up.
Will I face any alignment problems.?
Thanks.
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#2
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With the risk of stating the obvious - I hope you are fitting S4/GTS calipers at the front of the car too...
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To build on Cheb's stating of the obvious, IIRC the stock bias valve is 18% - meaning that 82% of the braking force is done by the fronts and 18% by the rears.
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Thanks guys.
I am currently fitting S4 brakes and suspension to the front which is why I haven't even had time to look at any potential rear brake set-up problems yet - which is why I asked the question.
Andrew -
Will it be OK to have 82/18% brake bias with S4 front brakes and GTS rear brakes? - Why did you post this?
Thanks.
I am currently fitting S4 brakes and suspension to the front which is why I haven't even had time to look at any potential rear brake set-up problems yet - which is why I asked the question.
Andrew -
Will it be OK to have 82/18% brake bias with S4 front brakes and GTS rear brakes? - Why did you post this?
Thanks.
#5
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the rear proportioning valve can be changed
could you please list the year and model of your car
could you please list the year and model of your car
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Thanks guys.
I am currently fitting S4 brakes and suspension to the front which is why I haven't even had time to look at any potential rear brake set-up problems yet - which is why I asked the question.
Andrew -
Will it be OK to have 82/18% brake bias with S4 front brakes and GTS rear brakes? - Why did you post this?
Thanks.
I am currently fitting S4 brakes and suspension to the front which is why I haven't even had time to look at any potential rear brake set-up problems yet - which is why I asked the question.
Andrew -
Will it be OK to have 82/18% brake bias with S4 front brakes and GTS rear brakes? - Why did you post this?
Thanks.
HTH,
Alex
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My 928 is the same as Alex'es - a 1984 S2 Manual. Now with front S4 Brakes and suspension. Where can the brake bias / proportioning valve be found?
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#9
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The early cars have more rear brake bias from the factory. A few people have installed the early valve on S4's to increase rear bias.
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Hacker, the UK early-ish cars - S2 (4.7 twin dizzy 310bhp) came with ABS as standard in 1984...
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You can change the bias valve to give you more rear participation, and it will help right up to the point where the ABS needs to help you with a slipping wheel. IIRC, the ABS affects -both- rear wheels if it determines that -either- is slipping. So don't go overboard on the rear bias, especially if you regularly drive on less-than-perfect surfaces like rain-slicked roadways.
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Done about 5000 miles now with this set up and it looks like the rear brakes are definitely taking more punishment than the fronts.
Not that this is a problem but I think the next time I replace the brake fluid I will switch to the 18BAR S4 limiter to put more bias to the fronts - just to see what happens over time. - Will report back.
Not that this is a problem but I think the next time I replace the brake fluid I will switch to the 18BAR S4 limiter to put more bias to the fronts - just to see what happens over time. - Will report back.
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Last edited by Porker928; 08-19-2013 at 03:45 PM.