my daughter's 944 has developed a brake "pulse" - you apply moderate brake
force and the decelleration is decidedly non-uniform, like the brakes are
grabbing and releasing - we just changed pads and rebuilt the calipers and
the problem didn't get better - in fact it might have gotten worse. we did
align the pistons to the proper 20 degree angle. I checked for any visible
warpage on the rotors and could see none - they are true to within a
thousandth. Any other suggestions?

--
bill
to email me, to to my web page, www.wbnoble.com and find my email
or unscramble the following by removing spaces and correcting the obvious
spelling errors

wil lia m_b_n obl e at msn daught com



--
Posted via a free Usenet account from http://www.teranews.com

How did you check the disc runout? With it on the vehicle?

I had a Jetta GLI with a similar problem. I found that the hub was warped
causing the brake disc to wobble creating a pulsating brake pedal. I let
the engine spin the hub and used a file to true it. Worked much better
afterwards.

People are saying that the wheels must be properly torqued down when
installed or it can create a warped disc.

Now I have also seen bad wheels and tires causing problems too. ;-)

Just a thought!
later,
dave
(One out of many daves)
http://vwdoc1.tripod.com/



"William Noble" <nobody@nowhere.com> wrote in message
news:450ce0f5$0$19745$88260bb3@free.teranews.com.. .

I checked the runout on the vehicle, turning the hub by hand - my only other
theory is a post I saw on renlist about the retaining screws loosening
causing problem - I'll try that next weekend - but I'm hoping someone else
has a good idea - the brake pedal doensn't pulse (much), but the amount of
decel varies significantly - this is what puzzles me
"dave AKA vwdoc1" <vwdoc1@ameritech.net> wrote in message
news:NAlPg.2632$IA.2532@newssvr11.news.prodigy.com ...



--
Posted via a free Usenet account from http://www.teranews.com

I had exactly the same problems - So get the rotors grinded down, and then
you have to bed them in properly.
Even if the rotors show they aren't out of round, if you dont properly bed
them, sticky brake material transfers not uniformly to the rotors causing
that to grab and loosen as you described.

I also thought it was those recessed flat head screws holding the rotor to
the hub - but you dont even need those screws.

Look here at the bedding procedure:
http://www.993faq.com/archives/cat_brakes.html

I went through a brand new "oem" brake rotor that vibrated and it was just
junk. Then I went to ZIMMERMAN, and properly bedded them and it seems to be
ok for the last 9 months.
So bed them rotors, and keep em hot!

For years 20 years I drove a Porsche 944 and never heard of such a
procedure - until now.
--

joliett
--------


"William Noble" <nobody@nowhere.com> wrote in message
news:450de71c$0$19645$88260bb3@free.teranews.com.. .

Does her 944 have ABS?

I had a similar recent experience with my S2 that turned out to be ABS
related.

Simon

"William Noble" <nobody@nowhere.com> wrote in message
news:450ce0f5$0$19745$88260bb3@free.teranews.com.. .