badm0j0

EDIT: THE ULTIMATELY NEEDED EVEN MORE BLEEDING. THANKS ALL FOR YOUR HELP!! ....AND THANKS TO RICK FOR PROVIDING THIS SERVICE!

PHOTOS AT BOTTOM OF PAGE


First: I've seached the forums and only found bleeding related responses. Any similar experience or knowledge of a thread i haven't found would be appreciated.

I recently recieved my purdy new blue PC calipers from Rick. They look great.

What we did:

Replaced all 4 calipers
Completely flushed out Motul fluid with Super Blue
Bleed again for good measure.
Checked pedal feel and have MUCH more travel before feedback.
Bleed through another quart of Super Blue again w/o any bubbles.

Concern:
Pedal still travels quite a bit more than was previously normal before feedback.

Has anyone experienced this?
Is there a break-in and rebleed needed due to the rebuilt gaskets and such?

Thanks in advance,
mike (badm0j0)

twohoos

This phenomenon is common with caliper upgrades (i.e. when the rest of the brake system stays the same). It's caused by changing the total clamping area of the brake pistons. As I understand it, unfortunately, the only way to restore the stock pedal feel is to change the size of the master cylinder.

There was a good article in Sport Compact Car a while back with all the equations/ratios you need to compute clamping force, pedal travel, master cylinder volume, etc. The same info's probably available elsewhere on the web if you can't find it.

Hope this helps. Someone correct me if I'm totally off my rocker here.

badm0j0

You are off your rocker, i'm sure. heh

Thanks for the feedback but these are STOCK calipers, just powder coated and rebuilt to stock spec. That shouldn't have the same system affect should it?

Love the powerslide in your avatar, btw!!

spider

Did you bleed them in the right order? You might want to bleed the rear ones more 'cause they are further away from the master cylinder.

twohoos

Oops! Yes, they should definitely return to stock feel. Afraid I'm out of ideas...

Full-size pic here.

Austin_S2000

Keep bleeding. After I rebuilt my own calipers I felt what you did. I swore I had all the bubbles out. Sure enough I didn't.

I used cheap stuff to get the system feeling right again and finished off with Motul 600.

Using Speed Bleeders made this easy (one person job). Are you using Speed Bleeders? If not are you having some one else pump the brake as you close the bleeder valve?

badm0j0

[QUOTE]Originally posted by twohoos
[B]Oops!

badm0j0

[QUOTE]Originally posted by Austin_S2000
[B]Keep bleeding.

badm0j0

[QUOTE]Originally posted by spider
[B]Did you bleed them in the right order?

turbo_pwr

I'll go with Aus, I had to rebleed mine about 5 times before I got all the bubbles out.