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Thread: 1st gen VR4 brake conversion big issues :(

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    1st gen VR4 brake conversion big issues :(

    Basically the brake pedal feels very soft and doesnt bite hard at all compared to the twin pistons. The master cylinder is pushing fluid out of the resevoir prett bad. Do the vr4's run a bigger booster or master cyl? Its pretty crap as im sick of brake fluid all over my nice car! I think this may be the reason the car doesnt feel like it brakes hard. (all new fluid, machined blank rotors, hawk hps pads) any help fellas?

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    Ti/AL goodness Not Verified Feedback Score 1 (100%) Pensky3thousand's Avatar
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    open all your bleeders one by one and make sure that fluid flows out of each. Verify that each one can easily be gravity bled. That will narrow it down to a collapsed line, or but most likely a blockage somewhere in the valves of the master or an internal leak. Do you have ABS?

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    Non ABS car. I have bled all the brakes many times even beforehand and all of the calipers bled no worrys at all. Even the new calipers bled very easily! I have never had a leak when using the old twin pot brakes, as soon as these went on, BAM leaking from master cyl. Is there the possibility of it being an internal caliper issue? only reason I don't think it is is it's leaving a thin black film on both rotors on the front leading me to believe they arnt actually clamping hard on them at all.

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    1st ever COTM and COTY verified Feedback Score 9 (100%) green-lantern's Avatar
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    Sounds like you might have a bad caliper. I want to think something is up with the rotor though. Like a warped rotor is pushing the pistons back in after breaking. Are you sure you don't have debris behind the rotor? I did this upgrade and it worked great. Did you put 1gen VR4 brakes on an NA or did you upgrade your 1st gen VR4 breaks to 2nd gen?

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    Possibility in the caliper, however both rotors have the same black shit all over them. ive done a few brake conversions in my time and MANY sets of rotors/pads over the years (doing another set on an aristo thursday actually) and never had this problem! this is what my rotors look like currently...

    As you can see with black shit all over them from the pads, which should of worn off by now! thats exactly the same on both sides. Wont be warped as Ive only done 20-30k's and they are machined, so they are flat alright! No debris behind the rotor 100%, I am under the wheel arch regularly and when this conversion took place everything got cleaned well and proper!
    argh.
    How can you check to see if its a bad caliper?

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    Thermal Engineer- Mmbr Since:8/2005 verified Feedback Score 0 Alex3000gt's Avatar
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    Strange, I have no idea.

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    That's really what I didn't wanna hear! lol

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    If you stomp on the brakes does it stop like you would expect?
    1990 JDM GTO TT with Vi-PEC plug-in V44 EMS, TD04-13T's, 3SX Downpipe, MP Hi-flow cat, ARC SMIC's, Aeromotive Stealth 340LPH pump, Fuelab 515 FPR, Ninja Performance 75amp hotwire kit, oohnoo fuel loop & rail adapters, Nylon braided ethanol fuel line, NGK AFX Wideband, K&N FIPK, Iridium plugs, HKS Twin Power DLI, Turbo XS racing BOV, 3SX poly mounts, Custom 280km/h speedo.

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    Nope not at all, even with my foot firmly down the braking is substandard by anyones means. Def something not right here

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    Master cycliner maybe? Have you asked this question on AMC? I'm sure there have been others fitting GTO brakes to a Magna? After going for a drive when you look at the caliper is the pad floating free from the rotor or does it look normal? I assume you bled them in the correct sequence? rear left, rear right, front left, front right? Have you inspected your brake lines? no swelling brake lines that might be expanding under pressure?

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