brakes Sudden Pulling To The Left Post Braking.

[gliding_serpent2]

Tracked my car 2 weeks ago.  Did not drive it much since (maybe 30 min drive 2 days ago).  I am driving to work this am and suddenly after moderate braking the car starts pulling to drivers left.  I engage the brakes a few more times and it settles and soon disappears.  Not long later the same thing again post breaking.  This time a slight pull left remains.  No obvious squeal.  No big bumps hit.   I pull over and front calipers are cool and both rear drums are equally mildly warm.  It is a cool morning.  I did not get a good look at the pads.   A solid 1.5 hour sporting back road drive later with no issues at all. 

 

My theory is brake dust in the pins and the front calipers getting mildly stuck.  I plan to disassemble, polish the pins as needed, and re-grease. 

 

Any other thoughts?

 

UPDATE: brake lines are brand new stainless that were installed the week before track use. 

Edited September 10, 2013 by gliding_serpent

[ray_]

How old are the flexible lines to the front calipers?

 

GL,

[mikebontoft]

I would agree with it getting sticky. since it pulls to the left after you release the brakes, I would investigate the left caliper and hoses.

edit: as mentioned above , check hose condition as well. sometimes they deteriorate enough to collapse internally and not allow the pressure to be released.

Edited September 10, 2013 by mikebontoft

[FB73tii]

Brake dust theory unlikely--did you change pads after track and then this started happening? If you still have rubber lines replace them as most likely they are now one-way valves. If already stainless braided then unusual. let us know what you find.

--Fred

[M3M3]

How old are the flexible lines to the front calipers?

 

GL,

if the car is being tracked, i am hoping the answer is nearly new, along with the caliper seals.

 

i would be taking the rear wheels off and checking rear brakes and ebrake mechanisms.

 

and...check play in front wheel bearings.

[mikebontoft]

one-way valve... I almost said that

[gliding_serpent2]

- Pads were not replaced post track, although I do have a new set of potterfield R4-s pads to install when I get new front rotors.  Ample pad left on the fronts. 

- brand new stainless lines the week prior to using it at the track

- unsure about caliper seals being old or new.  Brakes were given a thorough check this spring. 

 

p.s. in an older post I used to have slight brake dive, but that was 100% fixed with the new lines. 

[mikebontoft]

I would be taking a closer look at the caliper then.

[gliding_serpent2]

I anticipate ordering a calliper rebuild kit. New seals and rubber

[TobyB]

yeah, you probably have a sticking caliper. 

Stock calipers tend to get cooked a bit.

 

How are your front wheel bearings?

 

t