Bedding a new set of Bimmerworld Hawk HT-10 brake pads

----- Original Message ----- 
From: "James Clay" 
To: "E36M3" 
Sent: Wednesday, July 24, 2002 12:43 PM
Subject: [E36M3] HT-10 pads - care and feeding


> Anyone have suggestions on how to best bed in these new pads and rotors?
>
> I've heard a wide variety of advice in this regard over time, and thought
> this would be a good topic for debate on a slow list night... 

OK, here is the best and most up to date info on the use of these pads that
we have...  First, use rotors that are in good condition - proper thickness,
no excessive surface wear patterns.  Otherwise, as much as we like to sell
parts, there is no reason to replace rotors just because the pads are being
replaced.  Bedding procedure - there is an insert in the box that describes
the process.  I think it is a little hard to bed the pads on the street - I
prefer a practice session at the track.  Start the session using the brakes
moderately for about 10 minutes, then take a few laps with absolute
threshold braking.  Let them cool for 30+ minutes and you are done.  These
don't seem terribly affected by bedding procedure.  In a pinch we have
bedded them on a pace lap or in the case of endurance racing, taken a couple
of easier laps before braking normally after a pad change.

Brake ducting - not usually required for these pads.  They take up to 1,800F
temps.  Use a super high-temp fluid (we use AP 600) and you shouldn't have
fade or warping problems except on very heavy cars in moderate temps (full
stock weight plus two occupants) or stripped cars on very hot days.  On
cooler days, you will need to remove the ducting to keep the brakes
operating in the correct temp range - cooling in this situation will result
in decreased rotor life due to fractures in the metal structure.  Remove the
hoses - blocking them off will limit all natural cooling and will overheat
the system.

James


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                         James Clay
                  http://www.bimmerworld.com
                  Engineered BMW Performance
         World Challenge / SCCA / BMWCCA Racecar Rental
                   Genuine and OEM BMW Parts
                      (540) 639-9648
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