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2003 911 C4S, Intermittent brake pull to right. Brake fluid replaced. Replaced all pads, no change. Car has 55,000. Where do I go next? Sticky caliper maybe? Brake booster? Any suggestions welcomed.

Edited by O3C4S

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When you say it pulls to the right, does that happen when the brakes are applied or just occasionally when driving normally?

 

If it pulls to the right when braking it could be sticking pistons on the left side so that braking power on the left side is decreased.   

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only does while braking. brake dust on right side is slightly more than left possibly indicating problem. was going to try to bleed system. can these pistons be rebuilt or reworked or?

not sure. don't want to replace if repairable.

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23 minutes ago, O3C4S said:

only does while braking. brake dust on right side is slightly more than left possibly indicating problem. was going to try to bleed system. can these pistons be rebuilt or reworked or?

not sure. don't want to replace if repairable.

 

The calipers on these cars are fully rebuild-able.

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I had an issue like this with a non-Porsche and found the rubber brake line on the offending side had swollen internally and restricted the brake fluid flow to the caliper.  Not sure Porsche's are susceptible to this but another thing to check.  Does it bleed like it should, with good flow when you crack the bleeder?

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Sorry, Way late on this reply,

I rebuilt calipers with new seals and dist caps. easy fix. Piston walls and pistons were in a-one shape. cleaned and reinstalled. Good improvement, pads were relatively new so didn't change.

Bleeding was simple with assist by wife on the pedal.  Small quantities of bubbles when bled. I actually pre-filled calipers with fluid before installation to help minimize fluid waste and reduce air bubbles. Not sure what people think of that method but I'm anal sometimes, worked for me. Bled fronts only. Ran a weekend Road America after rebuild, worked great. Normal and even brake dust accumulation on both sides.

Also had 4 wheel alignment to double check pulling. Specs were off a bit so this contributed to excellent tracking while momentary hands off steering wheel, no wandering. So I believe result was a combo of both fixes.

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Glad you solved the brake pulling problem.

 

When bleeding I prefer to use a vacuum bleeder to drag the fluid through and out.  They are not expensive - about £30 - but you need a compressed air supply to operate it.

 

I used to bleed the brakes using your method of pressing the pedal to the floor and cracking the nipple open, or using a non-return valve on the open nipple .  However, this method means that you push the M/C piston down beyond its position of normal travel.  If there's any junk or bore scoring down the end of the M/C bore it could damage the M/C piston seal. 

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