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286
FIAT - 850 PASSENGER CARS
NOTE· On assembly, recall that outer lining pads
of calipers are fitted with two holes whereas inner
pads have one hole.
Upon release of the hydraulic pressure, the
piston has a tendency to return to its original
position, but the friction ring (9) will be stopped
against the washer (8), thus limiting the back travel
of the piston.
The net result is that the lining wear is eliminated
and the correct clearance between linings and disc
restored.
\
7
,
/
B
9
I
10
11
Fig. 449 • Removing bracket clamp pin lock plate.
1. Brake c<llipcr. - 2. Lock plate. - 3. All-purpose s:;li('r.
A clearance of .0236" 10 .0285" (0.600 to 0.725)
snIJuLd be allowed between the working friction
ring
(9)
and washers.
The sell-adjuster operation is as follows: when
applying hydraulic pressure, the piston (4) moves in
the cylinder; as a result of the lining wear, the
travel of the piston will be greater than the clearance
between the friction ring (9) and washers.
Under this condition, the friction ring (9) is stop-
ped
by
the washer (l0) while the piston continues
to move.
Fig. 450 • Tipping caliper mounting bracket clamps.
1. Brake caliper. - 2. Caliper mounting bracket. ·3. Tool A. 72238.
Fig. 4a1 • Side sectional view of the disc brake caliper.
1. Caliper body.• 2. Piston rubber boot. • 3. «0
It
ring
seal.·
4. Piston.• a. Pin lock nut· 6. Piston adjusting pin. - 1. Pin lock
washer. - 8-10. Friction ring washers. - 9. Friction ring. - 11. Spacer
lor washers.
Replacing Lining Pads.
Brake linings should be renewed whenever they
are no thicker than .079" (2 rom).
To replace the linings, take down the caliper
from the mounting brackets: slide off the pins
(after removing the retaining plates) and tip the
clamps.
The caliper can be thus lifted out from
the bracket (fig. 453).
Remove the worn linings and, before placing the
new ones, proceed as follows:
- push the piston to the bottom of the cylinder
bore (force required, 121 lbs - 55 kg) and check
that the datum mark (A. fig. 452) on the piston is
facing the bleeder screw.
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