Removing Caliper Piston Seal; Caliper Components; Installing Caliper Piston Seal; Lightly Polishing Piston Bore With Tool C-4095 - Dodge D150 1990 Service Manual

Rear wheel drive ram truck

Table of Contents

(2) Remove caliper piston seal w i t h wood pencil or

plastic tool (Fig. 13). Do not use metal tools as t h e y

could scratch piston bore.

PLASTIC STICK

Fig. 13 Removing Caliper Piston Seal

Clean t h e caliper components (Fig. 14) w i t h M o p a r

b r a k e cleaner, fresh brake f l u i d , or denatured alcohol

only. D o not use gasoline, kerosene, t h i n n e r , or a n y

s i m i l a r type o f solvent. These products may leave a

residue t h a t could damage the piston and seal.

Fig. 14 Caliper Components

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 not use rags or shop tow-

els. L i n t f r o m such materials can adhere to the cali-

per a n d piston.

Inspect the caliper piston. The piston is made f r o m

a phenolic resin (plastic material) and should be

smooth a n d clean. Replace t h e piston i f cracked or

scored. D o n o t attempt t o restore a scored p i s t o n b y

sanding o r polishing. The piston m u s t be replaced i f

Inspect t h e caliper piston bore. T h e bore c a n be

l i g h t l y polished w i t h h o n i n g tool C-4095 t o remove

very m i n o r surface imperfections ( F i g . 15). H o w -

e v e r , the c a l i p e r m u s t b e r e p l a c e d i f the b o r e i s

s e v e r e l y c o r r o d e d , r u s t e d , s c o r e d , o r i f p o l i s h i n g

w o u l d i n c r e a s e bore diameter m o r e t h a n .025

m m (.001 i n c h ) .

SPECIAL HONE

Fig. 15 Lightly Polishing Piston Bore With Tool

(1) Coat caliper piston bore, new piston seal a n d

piston w i t h b r a k e

(2) I n s t a l l n e w piston seal i n caliper bore. B e sure

seal is f u l l y seated i n groove (Fig. 16).

Fig. 16 Installing Caliper Piston Seal