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MASTER CYLINDER SERVICE

MASTER CYLINDER SERVICE. CBC AUTOMOTIVE TECHNOLOGY. ROAD TEST FIRST . INSPECT FOR TIRE PROBLEMS UNEQUAL VEHICLE LOADING WHEEL MISALIGNMENT BRAKE SYSTEM ROAD TEST DRY CLEAN ROADWAY AVOID CROWNED ROADS LIGHT AND HEAVY PEDAL PRESSURE INSPECT BRAKE WARNING LIGHTS.

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MASTER CYLINDER SERVICE

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  1. MASTER CYLINDER SERVICE CBC AUTOMOTIVE TECHNOLOGY

  2. ROAD TEST FIRST • INSPECT FOR TIRE PROBLEMS • UNEQUAL VEHICLE LOADING • WHEEL MISALIGNMENT • BRAKE SYSTEM ROAD TEST • DRY CLEAN ROADWAY • AVOID CROWNED ROADS • LIGHT AND HEAVY PEDAL PRESSURE • INSPECT BRAKE WARNING LIGHTS

  3. MASTER CYLINDER FLUID LEVELS • FLUID LEVEL WITHIN SPECS • UNEVEN OR LOW LEVEL INDICATE A BRAKE PROBLEM • FILL RESERVOIR • CLEAN CAP • INSPECT DIAGPHRAM • CHECK FLUID APPEARANCE • FILL WITH CORRECT TYPE FLUID

  4. FLUID TYPES • THREE TYPES • DOT 3, 4 AND 5 • LOW FREEZING AND HIGH BOILING POINT • ABSORBS WATER • COMPATIBLE WITH RUBBER AND METALS USED IN BRAKE SYSTEMS

  5. FLUID TYPES • DOT 3 AND 4 • DOT 4 ABSORBS LESS MOISTURE AND HAS HIGHER BOILING POINT THAN DOT 3 • DOT 5 • SILICONE BRAKE FLUID • VERY HIGH BOILING POINT • PURPLE COLORED • DO NOT USE IN ANTI-LOCK SYSTEMS

  6. BRAKE PEDAL TEST FOR FLUID LEAKS • DETERMINE INTERNAL AND EXTERNAL LEAKS • RUN ENGINE • HOLD STEADY BRAKE PEDAL PRESSURE • WATCH FOR LOW PEDAL AND NOISES 56C FIG 3-3 PG 56C

  7. PEDAL TRAVEL TEST • LOW PEDAL • AIR IN HYDRAULIC SYSTEM • LEAKS IN HYDRAULIC SYSTEM • INCORRECT PUSH ROD ADJUSTMENT • MISADJUSTED PARKING BRAKE • WORN BRAKE SHOES • ADJUSTER NOT WORKING • CHECK PEDAL TRAVEL SPECS

  8. MASTER CYLINDER TESTS • TRAPPED AIR • MASTER CYLINDER BYPASS • OPEN REPLENISHING PORTS • SHOULD NOT BE COVERED WHEN BRAKES ARE RELEASED • RESERVE STROKE ON POWER BOOST SYSTEMS

  9. REBUILDING MASTER CYLINDERS • DRAIN MC • DISASSEMBLE • INSPECT • REPLACE ALL RUBBER PARTS • REASSEMBLE • BENCH BLEED BEFORE INSTALLATION 62C FIG 3-11 DO NOT HONE ALUMINUM BORES

  10. BENCH BLEEDING • TWO METHODS • HOSES (66C) • HOOK HOSES TO PORTS • OPERATE PISTONS UNTIL AIR BUBBLES ARE GONE • SYRINGE (69C) • DRAW FLUID OUT PORTS AND INJECT FLUID BACK IN PORTS 66C P5-3

  11. VACUUM BOOSTER PUSHROD LENGTH • MUST NOT BE TOO LONG TO PREVENT BRAKE DRAG • MUST NOT BE TOO SHORT TO CAUSE LOW PEDAL 70C 3-16

  12. FINAL SYSTEM BLEEDING • BLEED MASTER CYLINDER ON VEHICLE (FITTINGS) • ENTIRE HYDRAULIC SYSTEM SHOULD BE BLED • USE CORRECT PROCEDURE • MANUAL BLEEDING • PRESSURE BLEEDING

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