Push Rod Clearance; Reference - Mazda MX-5 1990 Workshop Manual

05UOPX-017
ADJUSTING BOLT
05UOPX-018
9MUOPX-025
BRAKE SYSTEM
Installation note
Push rod clearance
p
Measure the clearance between the push rod of the power
brake unit and the piston of the master cylinder.
1. Place the SST atop the master cylinder. Turn the adjust-
ment bolt until it bottoms in the piston.
2. Apply 500 mmHg (19.7 inHg) vacuum to the power brake
unit with a vacuum pump.
3. Invert the adjustment gauge used in Step 1, and place it
on the power brake unit.
4. Measure the clearance between the end of the adjustment
bolt and the push rod of the power brake unit.
If it is not Omm (0 in), loosen the push rod locknut and turn
the push rod to make the adjustment.
Reference
By making the above adjustment, the clearance between the
push rod and piston (after installation of the brake master cyl-
inder and the power brake unit) will be as shown in the table
below.
I
When vacuum applied to unit is
approx. 500 mmHg (19.7 inHg)
Inspection
Fluid level sensor
1. Disconnect the sensor connector.
Clearance
O.1-0.3mm
(0.004-0.012 in)
2. Connect an ohmmeter to the connector.
3. Starting with the fluid level above the MIN mark on the reser-
voir, verify that there is no continuity.
4. Remove the brake fluid and verify continuity when the lev-
el is below the M IN mark.
5. Replace the sensor if necessary.
P-11