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1949 Delco Brakes Service Manual (Courtesy of Pat Gizz) |
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DELCO BRAKE SERVICE MANUAL |
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frame.
Remove the hose from the wheel cylinder.
—Remove cap screws which fasten
wheel cylinder to brake backing plate; remove retracting springs from
anchor pins and disconnect connecting links. Wheel cylinder can then
be withdrawn.
To remove rear wheel cylinder :
—Follow the same instructions as for
the front wheel cylinders
except copper tubing must be disconnected at the wheel cylinder
inlet. Wash all parts in Declene. Inspect and replace all worn or damaged
parts with genuine Delco Brake parts. Cylinder bores should be inspected
for scratches, pits, or corrosion. If found rough or corroded, smooth
the surface with crocus cloth, or fine wire scratch brush. Wash cylinder bore
carefully after this operation.
If badly scratched, replace with new cylinder
assembly.
Honing of brake cylinders is not
recommended. |
All new Delco Master Cylinder and
Wheel Cylinder bores are bearingized by diamond boring and rolling
under heavy pressure to obtain a highly polished hard surface. Honing
destroys this finish and leaves a softer, rougher surface which causes
rapid piston cup wear. Honing also enlarges the bore. If clearance between
the piston and bore is increased too greatly by honing, heavy braking
pressure may force the heel of the rubber cup between the piston and the bore pinching the
rubber and causing early
failure.
If the bore of the wheel cylinder
can be restored, carefully inspect all internal parts. If they show excessive wear or corrosion, replace with
new Delco pistons, cups, and spring. A Delco Wheel Cylinder Repair
Kit is available for each application and contains all the necessary
rubber parts to make a complete repair job. (See Figure 10.) Some Kits
also contain piston spring in addition to cups and
boots. |
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Fig. 9—Delco Hydraulic Brake
Wheel Cylinder (Exploded View)
7 |
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