Mitsubishi 3000GT Service Manual page 890

Good No good
When engine is When engine is
stopped
started
SERVICE BRAKES
CLEARANCE BETWEEN ;RAKE PEDAL AND FLOOR
BOARD
1. Turn off the carpet etc. at under the brake pedal.
2. Start the engine, depress the brake pedal with approxi-
mately 500 N (110 Ibs.) of force, and measure the clear-
ance between the brake pedal and the floorboard.
Standard value (D): 80 mm (3.1 in.) or more
3. If the clearance is less than the standard value, check
for air trapped in the brake line
If necessary, check the brake system mechanism
(excessive shoe clearance due to faulty auto adjuster)
and repair faulty parts as required.
4. Return the carpet etc. to the original position.
BRAKE FLUID LEVEL SENSOR CHECK
2. Move the float from top to bottom and check for continuity.
3. The brake fluid level sensor is in good condition if there
is no continuity when the float surface is above "A", and
if there is continuity when the float surface is below "A".
BRAKE BOOSTER OPERATING CHECK
For simple checking of brake booster operation, carry out
the following tests.
1. Run the engine for one or two minutes, and then turn
the engine off.
2. Step on the brake pedal several times with normal pres-
sure.
If the pedal depresses fully the first time but gradually
becomes higher when depressed succeeding times, the
2 1 4 1 1 0 0 6 2
0 0 0 0 2 1 2 4
booster is operating properly.
If the pedal height remains unchanged, the booster is
faulty.
3. With the engine stopped, step on the brake pedal several
times with the same pressure to make sure that the pedal
height will not change.
Then step on the brake pedal and start the engine. If
the pedal moves downward slightly, the booster is in good
condition. If there is no change, the booster is faulty.
4. With the engine running, step on the brake pedal and
then stop the engine.
Hold the pedal depressed for 30 seconds. If the pedal
height does not change, the booster is in good condition.
0 0 0 0 2 1 2 5
If the pedal rises, the booster is defective.
Brake booster performance is satisfactory if it passes all three
operating tests.
If the brake booster does not pass all three tests, there may
be a fault in the check valve, vacuum hose or in the booster
itself.
TSB Revision
for brake fluid leaks.
and