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      05-04-2013, 03:46 PM   #1
Swadeness
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soft pedal after new pads and rotors

Today I installed new rotors (bmw perf.) Ferodo pads, SS brake lines (front, rear inner and outer), and TI shims. I've never done a brake bleed before but I used a power bleeder at 10 psi, used the proper sequence (twice), and I think I did everything right. Unfortunately I do not feel any of the improvement in pedal feel or stopping power that was expected. In fact the pedal feels softer now. I can still stop well but the pedal feels about a third softer on initial braking and I get almost double the pedal travel before I can feel that initial bite. I did a bedding in procedure and felt a small improvement, I just got done doing a more thorough bedding in but have not had the chance to drive it after the brakes cooled. Either way I don't think I'll see much improvement.

Anybody have any thoughts? Is it possible I somehow messed up the bleed?

Thanks
Wade
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      05-04-2013, 06:49 PM   #2
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It sounds like you liked the extreme initial bite the OEM pads have, and now you miss it. That's a personal taste thing. Also, the Ferrodos are a street/track pad designed to resist fade at race track temperatures. Their cold friction is similar to OEM pads, but they get stronger when they heat up after a few hard repeated stops. Try a race track or driving hard in mountains. That's what the Ferrodos do really well.
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      05-04-2013, 07:06 PM   #3
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I would rebleed your brakes again. Maybe try using a small rubber hammer to dislodge any trapped bubbles in your calipers. Brake bleeding order: RR, LR, RF and the LF - right?
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      05-04-2013, 08:05 PM   #4
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Heard the ti shims add some softness but don't know for sure since I don't have them on my car. I installed ss lines and the pedal did firm up a bit.
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      05-04-2013, 11:15 PM   #5
Swadeness
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Quote:
Originally Posted by Dackelone View Post
I would rebleed your brakes again. Maybe try using a small rubber hammer to dislodge any trapped bubbles in your calipers. Brake bleeding order: RR, LR, RF and the LF - right?
I used a rubber mallet when I did the bleed, but I might try again. What PSI do you use your bleeder at?

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Originally Posted by HeelToe View Post
Heard the ti shims add some softness but don't know for sure since I don't have them on my car. I installed ss lines and the pedal did firm up a bit.
I haven't heard about the TI shims adding softness but that may be it. I figured with everything fitting tighter in there and the SS lines that the pedal would have firmed up a bit.
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      05-04-2013, 11:17 PM   #6
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Quote:
Originally Posted by GaryS View Post
It sounds like you liked the extreme initial bite the OEM pads have, and now you miss it. That's a personal taste thing. Also, the Ferrodos are a street/track pad designed to resist fade at race track temperatures. Their cold friction is similar to OEM pads, but they get stronger when they heat up after a few hard repeated stops. Try a race track or driving hard in mountains. That's what the Ferrodos do really well.
This sounds like reasonable explanation for the initial bite. I may drive the ring today so I'll see then how they feel.
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      05-05-2013, 12:51 AM   #7
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Quote:
Originally Posted by Swadeness View Post
This sounds like reasonable explanation for the initial bite. I may drive the ring today so I'll see then how they feel.
I'd favor residual air as the most likely explanation. Difference in cold bite is also possible, though.

I swap between OEM and PFC08s for the track and do notice somewhat reduced initial cold bite for the track pads, although this goes away pretty quickly with even normal street driving. The squealing, however, is impossible to ignore...

I typically go about 15 psi in the power bleeder.
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      05-05-2013, 02:10 AM   #8
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Quote:
Originally Posted by Swadeness View Post
I used a rubber mallet when I did the bleed, but I might try again. What PSI do you use your bleeder at?
Stay under 15 psi. I normally keep it at 10 tp 12 psi. On older cars if you use too much pressure, you can literally blow off the brake res from the master cylinder. That is why I always keep it at 10 to 12 psi.
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