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Tech Tips - Brakes

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BRAKES


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THE MOST COMMON BRAKE DRAG PROBLEMS

    1. RESIDUAL CHECK VALVE LEFT IN MASTER CYLINDER.
      SOLUTIONS:  REMOVE RESIDUAL CHECK VALVE FROM MASTER CYLINDER. IF YOU HAVE REAR DRUM BRAKES INSTALL A10# INLINE RESIDUAL CHECK VALVE IN REAR HYDRAULIC SYSTEM.

    2. NO MASTER CYLINDER PUSH ROD FREE PLAY.
      SOLUTION:  ADJUST PUSH ROD FOR ADEQUATE FREE PLAY.

    3. AIR TRAPPED IN HYDRAULIC SYSTEM AND EXPANDS WHEN HOT.
      SOLUTION: 
       BLEED AIR FROM HYDRAULIC SYSTEM PROPERLY.  MAKE SURE ALL BLEED SCREWS POINT UP FOR PROPER BLEEDING.

    4. CALIPER NOT MOUNTING SQUARE TO ROTOR.
      SOLUTION: 
       REMOUNT CALIPER PROPERLY.

    5. AFTER INSTALL TEST DRIVE (A SHORT ONE) RAISE CAR AND SPIN TIRES.  IF THEY DRAG, DON’T DRIVE.  RE-CHECK AND IF YOU CAN’T LOCATE THE PROBLEM, 

 

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Brake Bleeding Instructions

IT IS A COMMON MISCONCEPTION THAT BLEEDING BRAKES IS DONE WITH PRESSURE, THE MORE THE BETTER. IN FACT, IF YOU WERE TAUGHT THE TWO-MAN PROCESS THERE IS A STRONG CHANCE YOU’RE UNDER THE IMPRESSION THAT BLEEDING IS ACTUALLY A CONTEST TO SEE HOW FAR YOU CAN SHOOT THE FLUID OUT OF THE CALIPER! NOTHING COULD BE FURTHER FROM THE TRUTH. A GENTLE STROKE AND FIRM BUT LIGHT PRESSURE DOES THE TRICK EVERY TIME. THE KEY IS TO GENTLY BUT FIRMLY MOVE THE FLUID THROUGH THE SYSTEM WHILE DISPLACING THE AIR TRAPPED IN IT.

HERE IS WHAT YOU WILL NEED: A PROPERLY SIZED BOX WRENCH AND A CLEAR PLASTIC BLEED HOSE ARE ESSENTIAL. GOOD QUALITY, BRAKE FLUID IS ALSO A MUST. IN ADDITION, YOU’LL NEED TO ENLIST THE HELP OF A COWORKER OR FRIEND. THOUGH YOU MAY HAVE PURCHASED A BRAKE BLEEDING TOOL, EITHER VACUUM OR PRESSURE, AND ARE SATISFIED WITH YOUR RESULTS, APPROACHING THIS TASK AS A TWO-PERSON OPERATION WILL ACHIEVE THE BEST RESULTS.

1) SLOWLY POUR FLUID INTO THE MASTER CYLINDER SO AS NOT TO AERATE THE FLUID.

2)ATTACH THE CLEAR PLASTIC BLEED HOSE TO THE BLEEDER AND OPEN IT. VERY SLOWLY STROKE THE BRAKE PEDAL BY HAND OR BY FOOT UNTIL FLUID COME OUT. NOW CLOSE THE BLEEDER.
3) ACTUAL BLEEDING SEQUENCE.

  •  HAVE YOUR PARTNER VERY SLOWLY, WITH MODEST PRESSURE (APPROXIMATELY 25-30- FT/LBS.) STROKE THE PEDAL ONE TIME UNTIL HYDRAULIC PRESSURE IS ENCOUNTERED. ASK YOUR PARTNER TO HOLD AT THIS POINT WITH THE SAME MODEST AND EVEN PRESSURE AND NOTIFY YOU THAT HE IS HOLDING.
    • OPEN THE BLEEDER, LETTING THE PEDAL GO TO THE FLOOR OR UNTIL IT STOPS USING THE SAME MODEST AMOUNT OF PRESSURE, THEN CLOSE THE BLEEDER
      AGAIN. NOTIFY YOUR PARTNER THAT THE SYSTEM IS SEALED.

4) REPEAT THE BLEEDING SEQUENCE (NEVER STROKE THE PEDAL MORE THAN ONE TIME) UNTIL ALL SIGNS OF AIR ARE PURGED (NO BUBBLES) FROM THE FLUID. DO NOT LET THE MASTER CYLINDER RUN DRY. CHECK THE FLUID LEVEL EVERY THIRD BLEEDING SEQUENCE OR SOONER, DEPENDING ON THE SIZE OF THE RESERVOIR.

5) BEFORE MOVING TO THE NEXT CALIPER, TAKE A SMALL BLOCK OF WOOD OR A PLASTIC HAMMER AND CAREFULLY TAP THE CALIPERS TO DISLODGE ANY ADDITIONAL AIR BUBBLES THAT MAY BE TRAPPED. THEN BLEED ONE LAST
TIME.

6) MOVE TO THE LOCATION THAT IS THE NEXT FURTHEST FROM THE MASTER CYLINDER AND REPEAT THE ABOVE PROCESS. CONTINUE UNTIL ALL CALIPERS HAVE BEEN BLED.

BEFORE REINSTALLING THE WHEELS, WE RECOMMEND THAT ALL SURFACES ARE WIPED CLEAN – INCLUDING CALIPERS, HOSE JOINTS, FITTING, AND ROTORS – TO MAKE SURE THEY ARE DRY AND FREE FROM SEEPAGE, DIRT, AND OILS.


Rear Drum Parts Placement

 

TECH-BRAKES-REAR DRUMS


Reasons for a Poor Brake Pedal

 


Brake Checklist