Join Date: Jul 2002
Location: Saturn (or SE Michigan)
From what I've read, it's integrated with the reservoir. Here's a pinpoint test from the 1997 Service Manual:
PINPOINT TEST B: BRAKE WARNING INDICATOR ALWAYS ON
B1 BRAKE FLUID LEVEL
Check brake master cylinder reservoir fluid level.
Is fluid level good?
GO to B3.
GO to B2.
B2 BRAKE SYSTEM LEAKAGE
Check brake master cylinder reservoir sealing points and external brake system for leakage. (Refer to Hydraulic Leak Test and Non-Pressure Leaks Check.)
Does system leak?
SERVICE as necessary, ADD fluid and BLEED system. REFER to Section 06-06.
FILL brake master cylinder reservoir. GO to B3.
B3 IGNITION WIRING CHECK
Check that ignition wiring is not within a 50.8 mm (2 inch) radius of the reed switch fluid level indicator assembly.
Is ignition wiring OK?
GO to B4.
REROUTE wiring as necessary.
B4 PARKING BRAKE PEDAL — CHECK
Check if parking brake is applied.
Release parking brake.
Pull up on pedal.
Is the warning indicator on?
CHECK for non-release of cable system or rear brakes. CHECK for weak control assembly release spring. REPLACE as required. REFER to Section 06-05.
GO to B5.
B5 FLOAT ASSEMBLY CHECK
Check if float is stuck or magnet is dislodged from float.
Is float functional?
GO to B6 .
REPLACE brake master cylinder reservoir assembly. REFER to Section 06-06.
B6 CHECK FLUID LEVEL SWITCH
Disconnect 3-pin plug on master cylinder fluid brake reservoir.
Measure resistance between outside two pins on reservoir.
Is resistance less than 5 ohms?
REPLACE 3-pin fluid switch level switch.
GO to B7 .
B7 CHECK FOR GROUND CONCERN
Check for grounded wire harness, Circuit 977 on connector C167 .
Is resistance more than 10,000 ohms?
SERVICE or REPLACE cable harness Circuit 977 (P/W).
REVERIFY warning lamp.
Edit corrected layout of last steps in pinpoint tests...
Last edited by IronChopz; 07-08-2004 at 09:43 PM.