Brakes still pulling right | FerrariChat

Brakes still pulling right

Discussion in 'Technical Q&A' started by Impactco, Aug 26, 2007.

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  1. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    This past month I changed out my 22 year old brake lines for new stainless lines in anticipation that my pulling to the right syndrome might be resolved. It has not:(. It does not manifest itself at all times but is most pronounced at low speeds when it does. I did a laser thermometer check of the caliper/disk after a drive today and the left rear and right front are about 20 degrees warmer than the other two. Pads were replaced last year with Porterfield R4-S and made no difference in the pulling tendency. All rear pads were adjusted recently to .004 clearance to the rotor. I plan to do a caliper rebuilds on the front but any other thoughts on resolution of this would be greatly appreciated.
     
  2. KENCO

    KENCO Formula 3

    Nov 1, 2006
    2,396
    FL
    Full Name:
    KJG
    Could be loose, worn steering components or bearings.
    Also, do you think the disc could have cooled by 20 degrees by time you walked to the other side of the car?
    You could measure the other way around the car to confirm.
     
  3. chairpilot

    chairpilot Formula 3

    Mar 3, 2007
    1,547
    LA, CA & Olympia, WA
    Full Name:
    PlateClipGuys
    My last post reply to this thread went wacko (sorry if it got through).

    Michael, I meant to say did you ever rebuild your left side calipers? Perhaps a piston is sticking. Also, double check you brakes for bleeding. Re-bleed them ALL starting with the rears first. I just did mine after replacing the left hoses using a vacuum pump system, then touched them up with my son doing the "old fasion" pedal pump/crack the bleeder valve method. Everything is near perfect (just a hint of right pull that goes away immediately)

    Bob R.
     
  4. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    Verified this. Checked more than once. Temps still hotter on LR/RF.

    Wheel bearings were re-torqued. I just re-torqued the steering rack and got a 4 wheel alignment.

    I have not yet rebuilt the calipers but I have the rebuild kits for the fronts. Where did you get rebuild kits for the rears?

    Brakes were bled twice last week after stainless lines installed. No change.
     
  5. bwassam

    bwassam Formula Junior

    Jan 3, 2005
    635
    North Bend, Oregon
    Full Name:
    Robert Wassam
    There was a thread about this subject about a year ago. The general consensus then was that one of the calipers was hanging up. In general, I would do a complete brake job on the car if I were you. Then if it still pulls to the right, you have some other problem, but you know beyond a doubt that the brakes are top notch and you don't have to worry about them.

    Bob Wassam
     
  6. JohnnyS

    JohnnyS F1 World Champ
    Owner Silver Subscribed

    Oct 19, 2006
    15,284
    Illinois
    Full Name:
    John
    Check the brake pads where the metal "ears" ride in the caliper. Sometimes there is a rough spot or metal burr that causes them to not float as designed. Just tank a metal file and lightly file on that surface to make it smoother. Don't file very much as the fit can become "sloppy".
     
  7. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    Will do that. Thanks for the advice guys.
     
  8. Gianluca

    Gianluca Formula Junior

    May 6, 2003
    349
    Centreville, Virgini
    Full Name:
    Gianluca Chegai
    Did you check your steering rack bushing on the passenger side? I also would guess worn steering rack bushing or suspension bushings.

    Gianluca
     
  9. hanknum

    hanknum Formula 3

    Nov 1, 2003
    2,050
    Santa Barbara
    Full Name:
    Henry
    Michael,

    Since this was before you did the lines, you know it isn't the flex lines. Still could be a blockage in the hard lines though. I don't think 20 degree diff is anything to worry about. What are the actual temps and what is the %diff? When it pulls, is there a tug in the steering wheel? If there is it would probably, be uneven front braking, if it is more gradual, then it would probably be from the rear.

    BTW, I know a good and trustworthy brake shop here in Vta.

    Henry
     
  10. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    I re-torqued the frame/rack bushings recently. It is possible the internal rack bushings have some role in this issue since there is a little slop in the steering on center. My suspension bushings are in pretty good shape.


    If I am at slow speeds (like coming to a stop light) and apply brake pressure, the steering wheel turns to the right quite substantially. At high speeds, it is not as noticeable. I'll record the temps after my next drive. Thanks!
     
  11. wingfeather

    wingfeather F1 Rookie

    Feb 1, 2007
    3,653
    rock bottom
    Sorry if this answer is WAYYY off, but... I had a new car that would pull just before coming to a complete stop. It was due to the front alignment being set too aggressively & the tires would catch any inconsistency/trimlining in the road. I cannot remember if it favored one side or not, though. Any problems with tire wear or alignment noticed?
     
  12. Doctor Mark

    Doctor Mark Formula Junior

    Dec 15, 2005
    921
    Georgia
    Full Name:
    Mark Gronsbell
    Strongly suspect that one or more of the caliper pistons are hanging/frozen. Common problem on older Ferraris even if the fluid is flushed yearly.
     
  13. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    Just had the alignment done last week - didn't help.

    My suspicions also - question is, front or rear? I'll rebuild the fronts first and see what happens.
     
  14. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,389
    Frederick, Maryland
    Full Name:
    Brian Brown
    The rotors should not have a 20 degree difference in temperature. Since you have already replaced the pads and hoses, the only thing left is to rebuild the calipers. This is the cause of your pull.

    Brian B.
     
  15. chairpilot

    chairpilot Formula 3

    Mar 3, 2007
    1,547
    LA, CA & Olympia, WA
    Full Name:
    PlateClipGuys
    Michael,

    Don't do what I just did on the front rebuild kits (from Nick Forza in WA). I spent $154 for fronts and rears. If you still need to buy them, check out Performance Products in the SF Valley at 8000 Haskell Ave. Van Nuys 1-800-423-3173 - www.automotion.com. Their Porsche 914/6 kit should work to your fronts (#903131 - $13.95 each side). Rears are NLA from them so you may need to do the Nick Forza thing for those. Check some old FC threads to confirm all this.

    Also check out their 914 rear brake caliper plugs #904635 (a bit pricey at $10.95 ea.) But their more stout that the original small allen head caps - perfect for accessing the rear e brakes/pads clearance adjustment. Though one side cap is totally jacked up, I'm keeping the originals for the next owner.

    I just received my rear ebrake seals from Superperformance in the UK. They look correct ($40 both sides). I I'm getting my brake hoses from them too ($60 for all 4).
     

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