Table of Contents
Advertisement
•
BRAKES
5 - 37
(6) Tap t h e support k e y and spring i n t o place w i t h
a p i n punch or d r i f t (Fig. 12).
SUPPORT SPRING
CALIPER
SUPPORT KEY
BRASS ROD
KEY
RETAINING
SCREW
RK85
Fig. 12 Installing Support Key And Spring
(7) A l i g n t h e notch i n t h e support k e y w i t h t h e
screw hole i n t h e caliper.
(8) I n s t a l l t h e support k e y r e t a i n i n g screw. T i g h t e n
t h e screw t o 20 N«m (15 ft-lbs) torque. B e s u r e t h e
b o s s o n t h e s c r e w i s f u l l y seated i n t h e s u p p o r t
k e y n o t c h ,
(9) I n s t a l l t h e wheel a n d t i r e assembly a n d lower
t h e vehicle.
(10) Top off the master cylinder f l u i d level.
(11) P u m p the brake pedal to seat t h e shoes a n d re-
store n o r m a l pedal height. Do not move t h e vehicle
u n t i l a f i r m pedal is obtained.
CALIPER OVERHAUL
CALIPER
AND PISTON
REMOVAL
(1) Raise vehicle a n d support o n hoist or jack-
stands.
(2) Remove wheel and t i r e assemblies.
(3) Clean brake hose and t u b i n g connections a t cal-
ipers and brake hoses.
(4) Remove screw r e t a i n i n g caliper support k e y and
s p r i n g a n d t a p support key and s p r i n g o u t w i t h a
d r i f t or p i n punch.
(5) Remove calipers a n d brakeshoes f r o m adapters
b u t do n o t disconnect caliper brake hoses a t t h i s
t i m e .
(6) Support calipers on front axle. Position shop
towels under calipers to absorb spilled b r a k e f l u i d .
(7) Press brake pedal to h y d r a u l i c a l l y push caliper
pistons out o f bore. Pedal w i l l f a l l away w h e n pistons
pass cylinder bore opening. Place pistons on work-
bench for inspection.
(8) Prop and secure brake pedal to any position be-
l o w f i r s t inch o f t r a v e l t o prevent loss of brake f l u i d .
(9)
Disconnect
caliper
b r a k e
hoses
a t
frame
bracket.
(10) Cover brake lines to prevent d i r t entry.
CALIPER
DISASSEMBLY.
(1) Remove dust boot from caliper.
(2) Remove caliper piston seal f r o m caliper bore
w i t h s m a l l wood or plastic tool. D o n o t u s e m e t a l
t o o l s t o r e m o v e t h e seal. M e t a l t o o l s c a n s c r a t c h /
s c o r e t h e p i s t o n b o r e s u r f a c e .
(3) Remove t h e bleeder screw f r o m t h e caliper.
CLEANING
AND
INSPECTION
Clean t h e slide surfaces o f t h e caliper w i t h a w i r e
b r u s h and emery cloth. Then clean t h e caliper a n d
piston w i t h Mopar brake cleaner, fresh brake
fluid,
or denatured alcohol only. Do n o t use any other type
of solvent or cleaning agent.
D r y t h e caliper and piston w i t h compressed a i r or
allow t h e m t o a i r dry. Do n o t use rags or towels to
d r y t h e caliper and piston. L i n t from such materials
can adhere to t h e piston and caliper.
Inspect t h e caliper piston, piston bore and t h e seal
a n d boot grooves. Replace t h e piston i f corroded, p i t -
ted, scored, or w o r n . Do n o t a t t e m p t to restore t h e
piston surface b y sanding. Replace t h e piston i f nec-
essary.
V e r y l i g h t scratches or corrosion i n the piston bore
can usually be cleaned u p w i t h a fiber brush, or b y
polishing w i t h a h o n i n g tool or crocus cloth. How-
ever, t h e caliper should be replaced i f the bore is se-
verely corroded, scored, or i f h o n i n g a n d polishing
w o u l d increase bore diameter b y more t h a n .002 i n c h
(.050 m m ) .
D a r k b r o w n or black stains on t h e piston are
caused by t h e piston seal a n d are a n o r m a l oc-
curence. I n addition, l i g h t discoloration of the piston
bore is also n o r m a l . This discoloration is acceptable
as long as t h e bore and piston surfaces are i n good
condition.
I f i t is necessary t o polish t h e caliper bore, coat t h e
crocus cloth or h o n i n g stones w i t h fresh brake
fluid
only. Be sure to flush a n d clean t h e caliper thor-
oughly afterward. A l l residue generated b y p o l i s h i n g
m u s t be removed to avoid potential damage to t h e
piston, seal and bore after assembly.
Advertisement
Table of Contents
