Right front brake locks up before others

[Bow Tie 67]

Any ideas on what can cause this? More or less weight on right front? Alignment?

I would like any and all ideas that can cause this, so I can start troubleshooting.

Thanks, Matt

[Van B]

My first thought would be air somewhere in the left side.

[robertjra]

sounds like a plugged line what you need to do is get a pressure bleeder and run all the old fluid out if you don't get and fluid out of the left front try taking the hose off the caliper if no fluid out of the line take the hose off the steel line if no fluid out of the steel line go to the master cylinder. if you are getting fluid out of all 4 corners you probably have a stuck caliper the one on the left side is probably the one stuck. hope this helps.

[vintageracer]

Look at the rubber hose at the wheel that locks up first.

Rubber hoses are cheap. I would go ahead and replace both front and the rear rubber brake hoses if the car is old and you have never replaced the hoses. The rubber hoses break down from the inside out. What "may" look good can be bad.

A $30-$60 parts cost and a great time to change that old and nasty brake fluid.

[Skip Fix]

Look at the rubber hose at the wheel that locks up first.

X2

[Vegas69]

Is this at threshold braking? My RF locks up first at threshold as well. Your LF or RF better lock up first. If this is before threshold, then you have a problem.

[vintageracer]

A bad brake hose will not completely release brake pressure when you take your foot off the brake pedal when compared to a good brake hose thereby causing the brake with a bad brake hose to already have some amount of residual pressure in the brake caliper/wheel cylinder before you apply the brakes. That already present residual pressure results in the brake with the bad brake hose applying more pressure immediately to the caliper/wheel cylinder at that brake location when you step on the brake pedal and therefore causing the wheel to pull in that direction under braking or locking up way before the opposite brake with the good hose.

In extreme conditions I have had a bad brake hose lock up the brake in question with no brake pedal input and causing the brake to smoke if driven or completely lock down.

For a $100-$120 you can generally buy braided performance brake hoses. These hose provide a much more firm pedal and are a great upgrade for anyone interested brake performance.

[gsxrken]

Does the car pull under braking? The other caliper could be seized or binding somewhat and just not braking as much as the one that is locking up.
Also, if your car was ever whacked, your corner balance could be way off. A "lighter" corner would lock up first. A local raceshop or Porsche tuner should have the scales and may be willing to help you if that's the case.

[Bow Tie 67]

I finally have some time to respond. Great ideas guys, Todd it is at threshold. The car is setup with aftermarket everything. Braided lines, aggressive pads, floating calipers, and I know they are releasing. I do not have any pull while braking. Ken maybe on the money, my right front corner weight is 63 lbs lighter with me in the car. Although the pic I saw from motorstate I believe had a passenger onboard, so i'm thinking it may have had more weight on that corner. Hmmm well I'll get my step son to help me give it a good bleed and I'll test with and without him in the car. I'll be back!!

[Apogee]

It sounds like you're on the right track, the only thing I would add is that you should verify that your air pressures are equal side to side since that effects traction levels and therefore threshold braking and lockup characteristics.

Tobin
KORE3

[KWIKND]

Matt,

Let me know if you need a hand or a foot, I am just down the street.

Dan