Brake Bleed Q:
SuffolkD at aol.com
SuffolkD at aol.com
Wed Sep 8 02:40:54 EDT 2004
Bernie: Legit questions on a new to me car with ~20,000 miles on it. No
maint history except I could tell the brakes were new all around......certainly
NOT original at 133K.
1: Curious to why so little fluid comes out the rear bleeders.
To post a correction about the previous pad condition for you.
Since I first posted two weeks ago, the actual pad depth was far greater than
first thought. Except for the RR which had 1/3 pad left in and out. All had
Boots intact, greased, clean fluid in the res.
The wafer thin pad I referenced was in the dark, on a jack where the carrier
proximity to the rotor (not scored) was close that in the poor lighting it
tricked me. Upon securing the car and sticking my head against the back of the
caliper & carrier where the springs atop the pads go, was I then able to
accurately determine the pad thickness being 1/2 at worst, so R&R was NOT necessary.
Mintex reds standing by.
Just because I can go three plus track events & 20K on the same pads and
rotors before one set out of four wears through? Considering they were firm and
relatively fade free last week from 122 MPH - 70 MPH stops? "Spirited use"?
Teched three times over two years? Dot 4?
Since the brakes need attention (vs. before) new pads, rotors, boots and
grease, bleed and maybe new lines? MC too someday.
Since the listers have helped with the motor vacuum leaks (chipped now at 1.6
bar) the indicated 130MPH /actual 122 MPH at Watkins Glen necessitates
working the brakes HARD. Not surprising. Since the overall lap pace is now 15 MPH
faster in a 3800 lbs car.
MC bothering you? Considering the fluid is clear like spring water in the
res, why the panic?
The MC exhibits a specific condition repeatable time after time at a certain
HEAT condition. Pedal is firm on the street sans the 1" drop when the MC is
beginning to drag.
Someone explained the seals swell.
You don't like that explanation and you may be right, but when heat is
introduced to the MC the brakes drag in ambient above 80 degrees stopped in traffic.
Something is putting pressure on the lines. Maybe its something keeping the
piston from returning completely as designed.
Does it hurt to ask those who probably know more than I do?
So why can't this be a functioning system to you? Certainly there are cars
with more issues out and about.
Bentley lists the "bleed" sequence under 200 Turbo not the 200 3B. So I'm
double checking and asking Q's.
So I've run into some interesting (to me) stuff.......... no pee and moan.
Except from you.
-Scott by BOSTON asking................
> Come on Scott!
> You've been on this list a long time, why all this P&Ming? What some won't
> go through just to avoid a complete hydraulic system overhaul! Any
> maintaince history, or are you just pulling the list leg?
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