I've posted on this problem in the past, but the issue is still unresolved.

Under hard braking at speeds of 70mph+ my car pulls to the right--and I'm not talking a slight wander. Here's a list of things I've done since noticing the problem and the problem still persists:

Equalize tire pressures
Change tires
Swap Front rotors from R to L and L to R
Swap rims from L side to R side and vice-versa
Bleed brakes
Replaced front sway bar
Clean caliper pistons
Change pads
Replace shocks/springs

I'm waiting for my Tein RAs to settle in now before corner balancing/alignment. Could the pulling under braking possibly due to an aligment issue? When I installed the R Front Tein the A arm needed to be pushed down and the coilover needed to be compressed quite a bit more than the left side did (even though the ride height is the same for both sides). Would that suggest an alignment issue could be causing this?

Only other thing I can think is that the calipers are not quite the same (Wilwood 4 piston) or that the master cylinder is sending more pressure to one side than the other.

Thoughts?

 

Could it be that you are looking to much in the front when in fact the problem is in the rear?

Has the car seen any kind of accidents or been curbed?

 

No accidents, no curbs.

 

I had the same problem, but turns out my passenger rear tire only have about 20 psi or air in it, filled it up and that cured the problem

 

I've seen this problem before on a different car. It turned out that one of the brake hoses going to one of the calipers was damaged internally. There was a small cut inside the hose that allowed the brake fluid to branch to a different part of the hose, but the hose looked fine externally. When the pedal was pushed, the brake fluid in the line would go the wrong route and effectively pinch off the line so that no more pressure would reach the caliper. Therefore, the opposite side of the car would be braking harder. This only happened when the brake pedal was applied at a medium to hard level.

 

Could be that you toe settings are a little off? A nice pothole could do it.

 

You should have the alignment checked as soon as possible. The problem most likely lies in the alignment. Not enough positive caster would also cause a car to wander off.

 

Very perlexing! You've covered all of the likely reasons, and I agree that checking the alignment is the next step. If that isn't it, recheck some of the previous items again (since they're easy) before going into more invasive investigations such as master cylinder replacement, caliper replacement, etc.

 

Other things to check:

1. Get an alignment
2. Check your brake lines...(leaks?)

Otherwise....

 

Once I spoon on another set of tires I'll have the alignment checked, too (car tracks straight at constant throttle, though). ARGH.