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Pedal Travel; R32 Gtr With 6pot Ap Racing

josh23457
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josh23457 Enthusiast

josh23457

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Posted

Hey guys,

installed the front 360mm front rotors with matching 6 pot ap racing brakes on the gtr a while ago but seems as its been in the workshop for so long only just got to use them. I didnt update the master cylinder at all... the problem i am having is that there is about 1cm of travel between the breaks been on fully and not on at all. The travel is right at the top and the pedal, and it is rock hard... i would have thought that as i didnt upgrade the master cylinder then it may have been the other way round as in a long pedal!!! any help please its a little hard to drive being so sensitive...

thanks

paulR32gtr Mentor

paulR32gtr

Posted
Posted (edited)

Sounds like you have the ever elusive hard R32 GTR brake pedal. Sounds like they did a good job putting them on and the rest of your system is in good nic.

I have alcons on mine and still suffering from too much travel - going to get in and bleed them again this weekend, if that still does not help going to try a new master cyl.

I would say you will get used to them fairly quickly. My evo daily is much the same and it can be interesting switching between cars back to back but find I adapt pretty quickly.

Did you put AP's on the rear as well or still standard?

Edited by paulR32gtr
djr81 Grand Master

djr81

Posted
Posted
Hey guys,

installed the front 360mm front rotors with matching 6 pot ap racing brakes on the gtr a while ago but seems as its been in the workshop for so long only just got to use them. I didnt update the master cylinder at all... the problem i am having is that there is about 1cm of travel between the breaks been on fully and not on at all. The travel is right at the top and the pedal, and it is rock hard... i would have thought that as i didnt upgrade the master cylinder then it may have been the other way round as in a long pedal!!! any help please its a little hard to drive being so sensitive...

thanks

Well think about what you have done to the brakes.

The rotor is much larger in diameter 290ish vs 360mm. So there is 20% more torque for a similar amount of force.

The CP5555 (I guess that is the calliper?) has a smaller piston area than a Sumitomo & will be stiffer. Which aligns with what you are observing.

josh23457 Enthusiast

josh23457

Posted
  • Author
Posted

Well only did the front for the moment and wanted to see how they went.. the brakes themselves are just fanatstic, used to going through a set of pads in about 15-20 laps so these are so strong and wear so much better. Just a bit hard drving on the track with such a hard pedal especially in the wet, modulation is just a bitch!!! If i was to go for an afterarket pedal box would this do anything to change the feel or would that just move the travel of 1cm up and down the length of the pedal.....

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