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Why do my brakes suck in the rain?

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Old 03-10-2008, 05:42 AM
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Default Why do my brakes suck in the rain?

Ever since I've had my HP2's and the Powerslot slotted rotors and Hawk HPS pads up front I've been happy with my improved braking over oem but when it rains the stopping performance is greatly diminished to the point where I get worried I'm not going to stop on time. I feel like I really have to stomp on the pedal to come to a stop and I don't think it's normal especially since I didn't experience that with oem braking. Other factors: Motul RBF 600 was changed back in Sept., should I change it again, maybe give it a whole bleed all around?
Old 03-10-2008, 05:52 AM
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Default more water getting in to the pads?

Try several pumps before braking...have to get that water off the pads before hitting them hard.
Old 03-10-2008, 06:38 AM
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Maybe, it just didn't happen before which is what annoys me.
Old 03-10-2008, 06:50 AM
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Haven't people complained about the HPS' stopping ability in the wet?
Old 03-10-2008, 06:51 AM
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off my head, i can think of at least one person!
Old 03-10-2008, 06:59 AM
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I had HPS pads with my oem calipers and I didn't experience inferior braking in the wet.
Old 03-10-2008, 07:05 AM
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noob question...what are those HP2's? S4 calipers?
Old 03-10-2008, 07:06 AM
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Yes, B5 S4 calipers.
Old 03-10-2008, 07:14 AM
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Default could i bother you with how they mount and what wheels will clear them?

i see that they are what 321mm vs my 245mm, is that correct?
Old 03-10-2008, 07:27 AM
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Default Yes 321mm S4 rotors, the HP2 caliper is huge and wide.

A 16" wheel can clear but the problem lies in the width of the caliper itself. In most cases spacers may be required but basically go on Tirerack.com choose a 2001 S4 as a car and then you can see what wheels fit and which don't that way you can get an idea.


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