Master cylinder reservoir level sensor - TCCoA Forums
 
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post #1 of 4 (permalink) Old 07-07-2004, 04:58 PM Thread Starter
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Master cylinder reservoir level sensor

Last month my parking-brake-light indicator on the dash went on, and it hasn't gone off since.

The car brakes fine, and I after a bit of poking around it turns out that the light goes off when I disconnect the level sensor from the master cylinder reservoir. (which is odd to me, shouldn't the light go on on a wiring failure?)

Anyway, anybody know if it's easy to just replace that sensor? I tried getting it off the master reservoir, but I didn't want to break anything.

Any ideas?

Ivo
('97 3.8l v6 Tbird) (was: 4.6l v8 )
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post #2 of 4 (permalink) Old 07-08-2004, 10:24 AM
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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?
Yes
GO to B3.

No
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?

Yes
SERVICE as necessary, ADD fluid and BLEED system. REFER to Section 06-06.

No
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?

Yes
GO to B4.

No
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?

Yes
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.

No
GO to B5.

B5 FLOAT ASSEMBLY CHECK

Check if float is stuck or magnet is dislodged from float.

Is float functional?

Yes
GO to B6 .

No
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?

Yes
REPLACE 3-pin fluid switch level switch.

No
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?

Yes
SERVICE or REPLACE cable harness Circuit 977 (P/W).

No
REVERIFY warning lamp.

Edit corrected layout of last steps in pinpoint tests...

Last edited by IronChopz; 07-08-2004 at 09:43 PM.
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post #3 of 4 (permalink) Old 07-08-2004, 12:05 PM Thread Starter
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Quote:
Originally posted by IronChopz
[
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?
Yes No
REPLACE 3-pin fluid switch level switch. GO to B7 .
Seems that it is possible to replace just the 3-pin level switch... I still have to perform B5 and B6, but I'm thinking my switch is just broken....

Ivo
('97 3.8l v6 Tbird) (was: 4.6l v8 )
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post #4 of 4 (permalink) Old 04-21-2019, 11:12 PM
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I have the same issue...only thing it's that the pigtail harness...the male end that goes into the connector is shot. It's all broken...I tried looking online for replacement parts but I only find the female connection...anyone know the part number for the harness?
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