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Thread: Problems after fitting Brembos - Advice please

  1. #1
    Guest L16JAY's Avatar
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    Unhappy Problems after fitting Brembos - Advice please

    So I fitted up my R33 Brembos the other day but I still can't get a nice pedal feel. So far I've:

    - Fitted brakes
    - Bled system
    - Engaged ABS
    - Removed battery
    - Rebled system twice (once with car running)

    For some reason, I'm still not getting a nice pedal feel. I'm getting a slightly soft feel which firms on second pump. I'm confident that we've bled all air from the system. What I am concerned about is on the first pump, I'm getting a slight "sssh" sound coming from near the servo. It sounds like a vac/air leak? Can anyone shed some light on this? Am I doing something wrong?!

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    Guest jackm's Avatar
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    I've got a similar feel on my brakes, standard m/c (no and) and k sport front with z32/r33 rear. I've bled the brakes numerous Times so would like to see if any answers you get help.
    Last edited by jackm; 16-03-2015 at 12:18.

  3. #3
    Guest Desa's Avatar
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    Try to change BMC from r33

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    Guest ANDY black s13's Avatar
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    I haven't compared a 33 caliper to a stock 14 side by side ,but I suspect the 33 has slightly bigger pistons and more fluid capacity
    so a larger BMC from a 33 or z32 300zx would bring the pedal up to the same as the stock brake set up
    z32/300zx Bm57 in 15/16ths bore size or 1" version, the 1 1/16th version may be too large and give a very short on/off grabby pedal
    I ran my 14a some 8 pot Ksports/356mm disc's with stock rear calipers set up on a stock BMC and I had a very long pedal
    but after years of running cars with crap brakes I have an automatic pump the pedal reflex,
    I kind of knew it would be like it,from reading about swapping calipers V's BMC bore sizes etc,
    just I wanted to try out the K sports
    and I can confirm 2nd pedal dap and its like the car is chained to a concrete pole,ridiculous stopping power

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    You are bleeding both bleed nipples on each caliper, yeah. It sounds obvious but it doesn't hurt to check. The brembos have two per caliper compared to 1 per caliper on the s14 and z32.

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    No ideas about the 'shhhh' noise though.

  7. #7
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    R33 GTST BMC is a waste of time because it's a BM44 so flows less fluid than a standard S14 BMC (BM50). It would make your pedal feel worse. A Z32 BMC (BM57) is the optimum, ideally with a Z32 servo to match. I'm not saying that's your issue, but could be a good time to change them for uprated items and might solve your problem if your original BMC or servo are leaking.

  8. #8
    Guest v17nyb's Avatar
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    I'm going to ask the most obvious question......have you got the calipers mounted the correct way up?

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