3-5-8
Orig
CD373
Chapter 3
Section 5 MZ Tow Tractor
2. Cleaning and Inspection
(a) Thoroughly clean all parts not in repair kit with denatured alcohol. Inspect caliper
bore for scoring, nicks, corrosion or wear. Use crocus cloth to polish out any light
corrosion. Replace caliper housing if bore will not clean up using crocus cloth.
CAUTION: THE PISTON OUTER SURFACE IS THE PRIMARY
SEALING SURFACE IN THE CALIPER ASSEMBLY. IT IS
MANUFACTURED AND PLATED TO CLOSE TOLERANCE.
REFINISHING BY ANY MEANS, OR THE USE OF ANY ABRASIVE IN
THE FIELD IS NOT ACCEPTABLE.
(b) Carefully examine the piston exterior for scoring, nicks, corrosion and worn or
damaged surfaces. If any surface defects are detected, replace the piston.
3. Reassembly
(a) Lubricate piston assembly with clean brake fluid.
(b) Position the seal in the caliper bore groove.
(c) Assemble a new boot into the piston groove so that the fold faces the open end of the
piston.
(d) Press piston assembly into caliper bore with a suitable piston retractor. (Can also be
accomplished by using a C-clamp, Figure 5-9). Be careful not to unseat the seal.
(e) Position outside diameter of boot in caliper counterbore and seat with Delco
tool no. J-22904.
Figure 5-9. Piston Installation
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