Master Cylinder - New
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Master Cylinder - New Master Cylinder - New
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Carquest Wearever Master Cylinder - New

Part No. MCA630001 Warranty Details  
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All master cylinders meet or exceed O.E. form, fit and function.
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Package Contents:Master Cylinder
Reservoir Type:Single
Reservoir Material:Plastic
Reservoir Included:Yes
Master Cylinder Color/Finish:Gray
Secondary Port Size:M10 x 1.0
Port Count:2
Installation Hardware Included:No
Pedal Rod Included:No
Bore Diameter (N):1.125"
Mounting Hole Quantity:2
Master Cylinder Material:Aluminum
Product Condition:New
Primary Port Size:M12 x 1.0

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1 Question | 1 Answer
Displaying question 1
  • Q:

    my brake pedal pushes to floor, I have no leaks or lose of brake fluid, with truck off pedal goes half way to floor then stops while holding pedal down and starting engine pedal fades to floor. I can still stop by pumping brakes but pedal still fades. Could this be brake master cylinder? I have no indicator lights on showing any problems.

    Asked on 9/2/2014 by Bill from Niles,Ohio

    1 answer



      I'm glad to assist, Bill! It's definitely possible that a failing valve inside your master cylinder could cause this type of failure. If you have recently done a brake job or your fluid was low and you have added fluid, there could be air in the line. If there is air in your brake lines you could experience similar symptoms as air compresses easier than brake fluid. Once the vehicle is turned on your brake booster provides you additional force to your brakes.

      If you would like to try to bleed your brakes first I suggest purchasing a repair manual for your 2004-2008 Ford F-150 (excluding Heritage and Lightning) or 2006-2008 Lincoln Mark LT for the proper procedures, Haynes Part No. 36061.

      The standard method is to pump the brakes and have a partner open the bleeder valve on the caliper or wheel cylinder starting with the wheel farthest (usually right rear) from the master cylinder to the closest (typically left front). Make sure you have a catch can or bucket for the purged brake fluid. For each bleeder valve pump the brakes until they are firm then keep pressure on the pedal and have the helper open the valve. The pedal should drop to the floor. Do this for each bleeder valve until no air, only brake fluid, exits the bleeder valve.

      You may also find it easier to use an AutoCraft Test & Bleed Kit (Part No. 36061) which should allow you to do the bleeding on your own.

      Answered on 9/3/2014 by Heath, ASE Parts Specialist from AAP
Displaying question 1

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