Checking Power Brake Unit - Mazda 1975 Rotary Pickup Workshop Manual

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11. Press the reaction disc out of the valve body.
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Fig. 11-25 Reaction disc
12. Remove the push rod.
13. Remove the front seal from the front shell if
necessary.
11-D4. Checking Power Brake Unit
l. Ctreck the clearance between primary piston and
the push rod of the master cylinder and if necessary,
adjust the push rod so that the correct clearance is
obtained. The standard clearance is 0.1 - 0.5 mm
(0.004 - 0.020 inl.
Fig. 11-26 Clearance between piston and rod
Fig. 11-27 Power brake unit components
1. Diaphragm
2. Plate and valve bodv
3. Reaction disc
4. Push rod
5. Spring
6. Front shell
7. Front seal
8. Check valve
9. Nut
10. Flange
11. Valve rod and plunger assembly
12. Retainer
13. Bearing
14. Valve body seal
15. Rear shell
16. Air silencer retainer
17. Retainer key
18. Boot
l l : 7