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  •  » New master cylinder, residual press. valves and adj prop valve in 66

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    3/09/2019 6:22 PM  #1

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,729

    New master cylinder, residual press. valves and adj prop valve in 66

    The post... WHAT DID YOU DO TO YOUR MUSTANG TODAY got me to thinking that I had not done ANYTHING to my Mustang lately, so I decided to go ahead and install the new brake parts I had previously purchased.  I had purchased a 2000 Mustang V6 1" bore master cylinder, a couple of 2 psi residual pressure valves and an inline adjustable proportioning valve.



    The old proportioning valve was from a four wheel disc 77 Lincoln Versailles, and had been on the car since I put it together in 1992.  I was experiencing a rear brake DRAGGING condition.  My 66 has four wheel COBRA disc brakes, vintage 1999.

    Here are some pics of the new installation.  The MC fits great.  Contrary to what you would think, with my 427 stroker engine, I have better spark plug access with the MC ports on the engine side.  This is because there are no hard lines taking up space on the fender side of the MC where you can reach under there to get to #7 and 8 plugs.  Of course, routing of the hard lines with this in mind is mandatory.

    I have not got around to bleeding other than to bench bleed the MC and, of course, the mandatory red stuff where the hood hinge spring caught my arm, so I will have to provide a test drive report later.

     

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    3/09/2019 8:40 PM  #2

    Brents65
    I FYI 24-7

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    From: Upstate NY
    Registered: 7/22/2013
    Posts: 505

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Question... would I need the 2psi residual pressure valves with a similar set up? 4 wheel disc, 2000 mustang MC.

    65 mustang coupe, 351W, C6-  2800 stall, B&M blower, 9inch- trac-loc 3.70 gears
     

    3/10/2019 7:41 AM  #3

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,780

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Brents65 wrote:

    Question... would I need the 2psi residual pressure valves with a similar set up? 4 wheel disc, 2000 mustang MC.

    Not to hijack but to add....

    What I did yesterday was:  Fine tune the booster pushrod to the 2000 V6 MC, add two pound RP valves to both brake circuits, and re-bleed the system.

    NO CHANGE to my problem which is excessive pedal travel before a solid pedal.  In other words, the RP valves did not help or improve or change anything.  I was just grasping at straws.  System is GT 12.5 inch brakes on front and Explorer brakes on rear.

    After another consultation with MS (he had not tested his system at the time), he suggested that my problem might be the Explorer calipers having a larger piston area than the Mustang brakes that the MC was designed for.  The Explorer uses a 1 1/16 inch MC and the Mustang V6 is 1 inch. 

    I am going to buy a M10x1.0 bubble plug and block the rear and front circuits one at a time.  If blocking the rears makes a significant improvement that should tell the tale.

    Short version....I don't think the RP valves do any good on most normal systems with four wheel discs.  They are normally used for old car systems with the MC lower (under the floor) than the calipers.

    BB
     

    Last edited by Bullet Bob (3/10/2019 12:57 PM)

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    3/10/2019 8:38 AM  #4

    Brents65
    I FYI 24-7

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    From: Upstate NY
    Registered: 7/22/2013
    Posts: 505

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Bullet Bob wrote:

    Brents65 wrote:

    Question... would I need the 2psi residual pressure valves with a similar set up? 4 wheel disc, 2000 mustang MC.

    Not to hijack but to add....

    What I did yesterday was:  Fine tune the booster pushrod to the 2000 V6 MC, add two pound RP valves to both brake circuits, and re-bleed the system.

    NO CHANGE to my problem which is excessive pedal travel before a solid pedal.  In other words, the RP valves did not help or improve or change anything.  I was just grasping at straws.  System is GT 12.5 inch brakes on front and Explorer brakes on rear.

    After another consultation with MS (he had not tested his system at the time), he suggested that my problem might be the Explorer calipers having a larger piston area than the Mustang brakes that the MC was designed for.  The Explorer uses a 1 1/16 inch MC and the Mustang V6 is 1 inch. 

    I am going to buy a M12x1.0 bubble plug and block the rear and front circuits one at a time.  If blocking the rears makes a significant improvement that should tell the tale.

    Short version....I don't think the RP valves do any good on most normal systems with four wheel discs.  They are normally used for old car systems with the MC lower (under the floor) than the calipers.

    BB
     

     Thank You!

    65 mustang coupe, 351W, C6-  2800 stall, B&M blower, 9inch- trac-loc 3.70 gears
     

    3/15/2019 2:26 PM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,729

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Result of all this swapping:
    After vacuum bleeding, the brake pedal travels 2" until it stops solid. Brakes work OK.  RPV addition is waste of time...

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    4/09/2019 3:30 PM  #6

    1fststang
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    Registered: 6/02/2013
    Posts: 419

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    I'm using the 92 ranger master cylinder and want to confirm which master cylinder port is for the front brakes and which for the back?

    I believe the front port runs to rear brakes and rear port runs to front brakes but want to confirm before bending up these last couple small lines.

     

     

    4/09/2019 3:58 PM  #7

    50vert
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    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,357

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Correct.

    "Those telephone poles were like a picket fence"
     

    4/09/2019 7:01 PM  #8

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,460

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    50vert wrote:

    Correct.

    Barry..............."does it REALLY matter"? I mean...the brakes don't really know the difference. IF...the bowls are the same size seems like which ever is easiest to plumb them up would a plus.
    ?!
    6sal6
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    4/09/2019 8:14 PM  #9

    Hornman
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    From: Mansfield, Texas
    Registered: 4/01/2013
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    Re: New master cylinder, residual press. valves and adj prop valve in 66

    6sally6 wrote:

    50vert wrote:

    Correct.

    Barry..............."does it REALLY matter"? I mean...the brakes don't really know the difference. IF...the bowls are the same size seems like which ever is easiest to plumb them up would a plus.
    ?!
    6sal6
     

     
    Mike, did you have a stroke? That is the only way you would have written that.

     

    4/09/2019 10:24 PM  #10

    50vert
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    From: QLD Australia
    Registered: 4/01/2013
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    Re: New master cylinder, residual press. valves and adj prop valve in 66

    Mike. are you getting a head start with Jack before BB gets there?

    "Those telephone poles were like a picket fence"
     

    4/10/2019 8:05 AM  #11

    1fststang
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    Registered: 6/02/2013
    Posts: 419

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    I'm trying to get the last two small lines made up that run from my master cylinder to the Wilwood Prop valve and the stainless is not co-operating.  I have been able to make the bubble flares for the master but the double inverted flares end up not looking good. I have tried reaming inside and small chamfer with file on outside.  The flare nut won't slide up all the way to the end and the flare doesn't seem to be as compressed as what it should.   Any suggestions?  this is the last time I use stainless.  I am using the Mastercool hydraulic flaring tool which had worked well on prior lines.

    I'm also thinking of trying the nickel/copper line if I can find it in short lengths anywhere local.  I'm a little worried the lines may look out of place though since pics online show them with the gold copper color. Not sure how they actual look in person. 

     

    4/12/2019 8:15 PM  #12

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,729

    Re: New master cylinder, residual press. valves and adj prop valve in 66

    6sally6 wrote:

    50vert wrote:

    Correct.

    Barry..............."does it REALLY matter"? I mean...the brakes don't really know the difference. IF...the bowls are the same size seems like which ever is easiest to plumb them up would a plus.
    ?!
    6sal6
     

    Sal, on YOUR car, it probably would not matter.  For everyone ELSE, though, why not just do it correctly?  I have always stated there are no dumb questions.  Some answers, however, are borderline.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

     

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