Seat Belts; Changing The Brake Fluid (Vacuum Brake Booster) - Porsche Boxster 1999 Technical Manual

Maintenance
Boxster
Seat belts
Procedure for changing brake fluid
-Fill up the brake fluid reservoir with new
brake fluid up to its top edge. Connect a
bleeding device to the brake fluid reser.
voir. Switch on the bleeding device. Bleed-
ing pressure approx. 1.5 bar.
Check function and condition
Functional inspection:
It must be possible to smoothly unroll the belt
strap from the belt retractor via the deflector fit-
ting by pulling evenly, and the tongue of the
seat belt must engage audibly in the buckle.
Jerkily pulling on the belt strap must lock the
belt retractor.
Continue with the brake fluid change at the
brake calipers (no particular tire sequence).
Open every bleeder valve until clear brake
fluid free of air bubbles escapes and until
the corresponding change quantity per
caliper is reached (approx, 250 cm3), It
must be noted that bleeding takes place at
both bleeder valves on each caliper.
Condition inspection:
The belt strap must undergo a visual inspection
for damage. If it displays evidence of damage in
the form of cuts, fraying, seam tears etc" the
seat belt must be replaced.
Use a collecting bottle to accurately check
the escaping brake fluid for cleanliness, lack
of air bubbles and to determine the brake
fluid used.
Some brake fluid is also drained off at the
bleeder valve of the clutch slave cylinder (ap-
prox. 50 cm3),
Changing the brake fluid
(Vacuum brake booster)
Important notes
Use only new brake fluid DOT 4. Observe the
change interval and the brake fluid quality.
Total brake fluid change quantity
approx. 1 liter.
The brake fluid change interval is 2 years
in conjunction with the Super DOT 4 brake
fiuid.
03 20 00 Maintenance
Printed in Germany, 1996
03 -18
986031