FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Brake Booster ??

    • 1 of 1

       

    6/15/2020 8:56 AM  #1

    Vkt-66
    FYI Addict

    Offline

    From: Bedford, Tx..
    Registered: 7/22/2013
    Posts: 142

    Brake Booster ??

    Power brake booster needs to be replaced ..   
    When I was replacing the master cylinder the plunger in the vacuum rubber came out which causes a very high vacuum leak when applying brakes... 
     With a Hi lift cam with 8" of vacuum which booster would be best to use on the "66" 
    I installed the mustangsteves power brake  booster unit B6566 back in 2007 ...
     I'm also considering adding a vacuum canister to help with the low vacuum.. 
     What do you guys suggest ??             Since I have to replace it 

    66 PonySilverBlue-289/gt40/roller/650cfm/ram air-T-5-cable-w4way.disc/4-245x50x16"
     

    6/15/2020 9:46 AM  #2

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,510

    Re: Brake Booster ??

    With 8" of vacuum there is no vacuum booster that will be effective.  Your options are vacuum booster with a tank and possibly also an electric vacuum pump, or go to hydroboost.  IMO hydroboost is a better system for this type of application.  I look at it this way, all Diesels use hydroboost because they make 0" of vacuum.  I have a small electric vacuum pump and tank in my Diesel F250 that is for HVAC controls, etc., but Ford decided a significantly more expensive hydroboost system was a better/safer choice for the brakes.  There's something to that. 

     

    6/15/2020 3:16 PM  #3

    50vert
    Senior 24-7 FYI Addict

    Offline

    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,427

    Re: Brake Booster ??

    I'm sure you could pick BB's brain, and find out how he mounted a belt driven vacuum pump.

    "Those telephone poles were like a picket fence"
     

    6/15/2020 6:36 PM  #4

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,510

    Re: Brake Booster ??

    Yeah, technically there is a third option: belt driven vacuum pump. 

     

    6/15/2020 7:46 PM  #5

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,858

    Re: Brake Booster ??

    OR.........Just "man-up" and go with manual disc brakes.  I have front disc only(manual) and it stops wayyyy better than it did with all drums.
    With brakes slammed on and down shifting all the way I have to fight to keep the rear from coming around. How much more stop power do I need?!
    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
     

    6/15/2020 8:41 PM  #6

    Vkt-66
    FYI Addict

    Offline

    From: Bedford, Tx..
    Registered: 7/22/2013
    Posts: 142

    Re: Brake Booster ??

    If I decide to go with HYDRO - Booster 
    WITCH ONE ?

    66 PonySilverBlue-289/gt40/roller/650cfm/ram air-T-5-cable-w4way.disc/4-245x50x16"
       •Thread Starter
     

    6/16/2020 5:23 AM  #7

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,510

    Re: Brake Booster ??

    I don't have any direct experience, but we were discussing this a little while ago and here's a write up another member did that appears to be fairly straightforward:

    https://fyi.boardhost.com/viewtopic.php?id=6166

     

    6/16/2020 7:10 AM  #8

    mustangermike
    Administrator

    Offline

    From: Cleburne
    Registered: 4/13/2017
    Posts: 204

    Re: Brake Booster ??

    I'm intrigued with the idea of a belt driven vacuum pump.  I guess it makes sense, but never realized something like that existed.  I assume they more than help with low vacuum?

    Owner of MustangSteve - 1967 Mustang Coupe 302, 2005 Mustang GT
     

    6/16/2020 8:14 AM  #9

    BobE
    Senior 24-7 FYI Addict

    Offline

    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,665

    Re: Brake Booster ??

    Vkt-66 wrote:

    If I decide to go with HYDRO - Booster 
    WITCH ONE ?

    I suggest contacting "Hydratech Braking Systems" out of Tennessee, www.hrdratechbraking.com.  They were a great help to me when I installed a hydroboost system in 2018.
     

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    6/16/2020 8:39 AM  #10

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,277

    Re: Brake Booster ??

    Just a note on that rubber seal that came out when you removed the mc.

    It is removable, and pops right back in place. If you coat it with grease, it will seal effectively.

    8” of vacuum?   Do you actually drive that on the street?  Or is it a pure race car?   Cannot effectively have both in the same vehicle to perform either function at its best.

    Hydroboost may be your solution.  The 96-98 Mustang GT unit at least has same bolt pattern as your MS system.  Rod length may be an issue.  It has been many years since I built a hydroboost setup for a customer, so I don’t remember all the details.   Other than it was a PITA.

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

    6/16/2020 11:12 AM  #11

    Vkt-66
    FYI Addict

    Offline

    From: Bedford, Tx..
    Registered: 7/22/2013
    Posts: 142

    Re: Brake Booster ??

    The amount of vacuum I'm talking about is at idle 8" but I have seen it somewhere near 10" at faster idle with AC on I have been driving it and I do feel some power assist but now with that rubber definitely leaking I notice it more that I'm on the manual which is very scary

    66 PonySilverBlue-289/gt40/roller/650cfm/ram air-T-5-cable-w4way.disc/4-245x50x16"
       •Thread Starter
     

    6/16/2020 1:44 PM  #12

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,277

    Re: Brake Booster ??

    A non-functional booster is dangerous because, due to the revised pedal ratio, you 33% less mechanical advantage at the brake pedal.   You might try just adding some grease on the seal and see how it does.

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

    6/16/2020 4:19 PM  #13

    67 Fastback
    FYI FORD Member

    Offline

    Registered: 12/25/2013
    Posts: 27

    Re: Brake Booster ??

    I had the same problem, added an electric pump now no issues. I mounted mine under the battery, wired to switch. Hums for a second or two at start up and you never notice it after that. Just stops like you expect it to.
    Good luck

     

    6/16/2020 6:40 PM  #14

    50vert
    Senior 24-7 FYI Addict

    Offline

    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,427

    Re: Brake Booster ??

    mustangermike wrote:

    I'm intrigued with the idea of a belt driven vacuum pump.  I guess it makes sense, but never realized something like that existed.  I assume they more than help with low vacuum?

    BB is happy with his. Genuine ford part.
    Are you gunna build something that might need help with vacuum Michael?
     

    "Those telephone poles were like a picket fence"
     

    6/17/2020 5:34 AM  #15

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,510

    Re: Brake Booster ??

    Ford used them on the IDI generation of Diesels (6.9 ('83-'87)and early 7.3 ('88-'94)), and the direct injected 7.3 ('95-'02).  For some reason they decided to use an electric pump when they went to the 6.0.  My guess is packaging made the belt driven pump too hard to mount. 

    The pump without a pulley is about $75-$125 on www.rockauto.com.  Your belt drive type will dictate what pulley you need to use, as well as where you can mount the pump. 

     

     

    1 of 1

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  Brake Booster ??

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.