Chrysler Crossfire. Manual - part 55

OPERATION

The BAS vacuum-powered brake booster functions like a typical brake booster under normal driving conditions.

During an emergency stop condition, the BAS control module detects a rapid rate of brake application by the BAS
diaphragm travel sensor (8). In the case of a BAS brake application, the BAS solenoid valve (2) opens the poppet
valve (5), which admits atmospheric pressure from inside the vehicle from the air filters (3-4) located at the rear of
the BAS vacuum-powered brake booster (1).

The full assistance from the brake booster is transmitted to the master cylinder from the output rod (10). When the
brake application is terminated, the control module receives a signal from the BAS release switch (6) and the BAS
solenoid valve (2) closes again. The BAS assistance is terminated.

1 - BAS BRAKE BOOSTER
2 - BAS SOLENOID VALVE
3 - AIR FILTER
4 - AIR FILTER
5 - POPPET VALVE
6 - BAS RELEASE SWITCH
7 - VACUUM PISTON

8 - BAS DIAPHRAGM TRAVEL SENSOR
9 - COMPRESSION SPRING
10 - OUTPUT ROD
11 - CABLE CONNECTOR FOR RELEASE SWITCH AND
SOLENOID VALVE
12 - VACUUM CONNECTION
13 - POWER DIAPHRAGM

BRAKES - BASE

5 - 53

REMOVAL

1. Remove

the

master

cylinder.

(Refer

BRAKES/HYDRAULIC/MECHANICAL/MASTER
CYLINDER - REMOVAL).

2. Disconnect the vacuum hose (1) at the booster

check valve (2).

3. Remove the brake rod pin retaining clip (4) that

holds the boosters push rod (1) to the pedal (3).
Then slide the push rod off the pin (2).

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BRAKES - BASE

4. Remove the booster retaining nuts (2) and the gas-

ket (3) that attach the booster (1) to the dash
panel.

5. Slide booster forward, tilt the booster upward

slightly, then remove the booster from the engine
compartment.

REMOVAL - RHD

1. Disconnect the negative battery cable.

2. Remove

the

master

cylinder.

(Refer

BRAKES/HYDRAULIC/MECHANICAL/MASTER
CYLINDER - REMOVAL).

3. Disconnect the booster check valve (1) and vac-

uum hose.

4. Disconnect the travel sensor harness connector (3)

and the solenoid valve harness connector (2).

BRAKES - BASE

5 - 55

5. Remove the brake rod pin retaining clip (4) that

holds the boosters (1) push rod to the pedal (3).
Then slide the push rod off the pin (2).

6. Remove the booster retaining nuts (2) that attach

the booster (1) to the dash panel.

7. Slide booster (1) forward, tilt the booster upward

slightly, then remove the booster from the engine
compartment.

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BRAKES - BASE

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