Volvo 164 1969 Service Manual page 160

3 4
Fig. 5-9. Brake components, rear whee l
l. Dr ive shaft
2. Brake disc
3. Cover plafe
4. Rear brake ca liper
VOLVO
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(due to the axia l p lay of the drive shafts when driv-
ing round bends or on rough ground). The A.S.B. de-
vice prevents a reduction in the pedal trave I (that is,
the distance from the peda l pos ition at fu ll brake app-
lication to the f loor p late). The A.S.B. device consists
of the fo ll owing (see Figl . 5-10). A spring (3), a washer
(4) wh ich ho lds the spring securely on the p iston, a lso
Fig . 5-10. Rear brake ca li per
l . Seal ing ring 9. Oufe r half
2. Pin 10. Venting nipple
3. Spring ll. Bolf
4. Wa sher 12. Refa ining clip
5. Pisfon 13. Brake pad
6. Rubber dust cover 14. Inner half
7. Retaining ring 15. Damping spring
8. Chann e l 16. Refaining pin
5 :8
a pin (2} wh ich is pressed into the caliper. The spring
moves on t he p in w ith a certa in amount of frict ion.
The sea ling ring's
(l }
have a sq uare section and press
a gain st t he p iston fr om the sli ghtly obli q ue groove
in th e housing . Th e fun ction of th e sealing ring s is
partly to prevent brake fluid from oozing, out and
partly to return the pistons to the rest position after
braking. The rubber dust covers (6) prevent dirt from
entering. The brake pads (13) are provided with
bonded facings and are hel d in position by means of
retaining pins (16).
FUNCTION
HYDRAULIC
The lower cylinders of the front wheel brake units
and the right rear wheel brake unit are connected
through brake lines to the primary chamber of the
moster cylinder, see Fig;, 5-11. In the same way the
upper cylinders of the front wheel brake units and the
left rear wheel brake unit are connected to the
master cylinder through the sccondary chamber.
Secondary circuif,
pressureless
t
Primary circu if.
pressureless
Fig .
5-11.
Res t positi o n
l. Warning lamp
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