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SECTION V. TESTING THE BRAKES
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TB-9-2300-426-20 Hydraulic and Air/Hydraulic Brakes Preventive Maintenance Manual
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SECTION VIII. PAINTING
TB 9-2300-426-20
4.  Do not take shortcuts like sanding a glazed brake lining, or cleaning them with drycleaning solvent. If a lining is
glazed, worn, or has grease or brake fluid on it, replace it along with all other brake shoes/pads on that axle. Replacing all
the linings on an axle keeps brakes working evenly.
5.  When brake linings become covered with dirt or mud, clean them with water and a brush. Never use drycleaning
solvent. It breaks down the material in the lining. Replace the linings if there is anything on them that the brush and water
won't take off.
6.  You should always play it safe. Take a look at the brake lining any time you have a wheel off. Replace all the linings
on that axle if the lining is worn to within 1/8-inch of the rivet heads. On bonded linings, follow the wear limit specifications
in the -20 technical manual.
SECTION VII. REPAIRS
1.  Do not repair master cylinders, wheel or air/hydraulic cylinders. When you find a bad master or wheel cylinder, order
a new one. Parts from a disposal point may look all right, but they can fail as soon as the truck gets on the road.
2.
Never cut corners on brake repair. That can be fatal to the driver and anyone who gets in the driver's way.
3.  Before you put any new brake part on a truck, carefully compare it with the old one. Mistakes are made in the supply
system. If it doesn't look or fit right, don't use it.
4.  Never substitute parts from another vehicle or brake system, even though they may look alike. Parts may look very
similar, but they don't always work the same.
5.  It takes time to do any brake job right. Don't put on a set of brake pads/shoes in a hurry. Take the time to look at the
wheel bearings and other components in the brake system.
6.  Copper tubing won't hold up to the high pressure in hydraulic brakes. It's not for hydraulic brakes because it can
rupture at a crucial moment, leaving the truck without any way to stop.
Always use steel.
9

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