Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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74ls1tr6
Calvin Grannis
Elk Grove,CA
(1072 posts)

Registered:
11/10/2007 10:05AM

Main British Car:
74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

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need thoughts using late model foot pedal box with booster?
Posted by: 74ls1tr6
Date: December 31, 2013 09:18PM

I was just wondering if I should get a late model brake pedal box that would utilize a booster? Or should I stay with my 71 brake pedal box in Brenda's GT that doesn't have a booster? Would like some thoughts from someone that has driven a car with both setups. What are your opinions?


danmas
Dan Masters
Alcoa, Tennessee
(555 posts)

Registered:
10/28/2007 12:11AM

Main British Car:
1974 MGBGT Ford 302

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Re: need thoughts using late model foot pedal box with booster?
Posted by: danmas
Date: December 31, 2013 10:06PM

Calvin,

I can't compare the two on a MGB, but I can on a TR6. The booster diaphragm failed while on a trip, causing a vacuum leak in the engine. I pulled the vacuum line and plugged it so the engine would run and I could get home. It was over a year before I replaced the booster, but I really couldn't tell the difference with or without.

I don't have a booster on my MG, and don't feel the need for one.


kerbau53
Geoff Morton
Naples, FL
(106 posts)

Registered:
08/09/2010 10:27PM

Main British Car:
78 MGB Ford 5L

Re: need thoughts using late model foot pedal box with booster?
Posted by: kerbau53
Date: January 01, 2014 05:07AM

I removed the pedal box and master cyl (w/booster) on my 78. Replaced with the dual circuit non boosted master you have. I'm much happier with the feel not to mention the simplicity.


MGBV8
Carl Floyd
Kingsport, TN
(2976 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

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Re: need thoughts using late model foot pedal box with booster?
Posted by: MGBV8
Date: January 01, 2014 10:52AM

Depends. I bet Brenda is used to modern, easy to apply brakes. Brake pedal effort is obviously greater with non-boosted brakes, but the overall feel is much better, IMO.

My experience is mostly with my Dad's '63 MGB & my '79 B. MIne are easier with a bit mushier feel. :)


Moderator
Curtis Jacobson
Portland Oregon
(4269 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

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Re: need thoughts using late model foot pedal box with booster?
Posted by: Moderator
Date: January 01, 2014 01:30PM

IMHO, a booster is dead weight on such a lightweight car and the more important issue is getting master cylinder selection right. You'll probably want a bigger bore than stock. With the later bracket, there are more upgrade options, but with the earlier bracket I only know of one (unless you'd consider dual cylinders, like a racecar. Have a look at Jim Blackwood's car.) Of course, you only need one good option. I plan on keeping the early bracket while upgrading to 15/16" bore by following the example of Rob Ficalora and Bill Jacobson as shown here: [forum.britishv8.org]


MGB-FV8
Jacques Mathieu
Alexandria, VA
(299 posts)

Registered:
09/11/2009 08:55PM

Main British Car:
1977 MGB Small Block Ford, 331 Stroker

Re: need thoughts using late model foot pedal box with booster?
Posted by: MGB-FV8
Date: January 01, 2014 08:08PM

You guys are sharp, Happy New Year!


74ls1tr6
Calvin Grannis
Elk Grove,CA
(1072 posts)

Registered:
11/10/2007 10:05AM

Main British Car:
74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

authors avatar
Re: need thoughts using late model foot pedal box with booster?
Posted by: 74ls1tr6
Date: January 01, 2014 09:45PM

Awesome!!

Between all of the opinions and suggestions, it was a no brainer to go with the upgrade that Rob and Bill came up with. That write up was easy to figure out. Dan said his brakes work fine. I remember reading all this information in these threads. This website and this group is the best.

Thanks,

Calvin

PS: ordered parts!!



BOOTLEG
Gary Rosema
Wisconsin
(46 posts)

Registered:
11/18/2013 07:26PM

Main British Car:
1978 MGB Rover 3.5L

Re: need thoughts using late model foot pedal box with booster?
Posted by: BOOTLEG
Date: December 17, 2015 06:52AM

Great topic. I am right now at this decision point.on my 78B. Because I am changing out the 4 cyl to the Rover 3.5, I am also making other changes while it's apart. I pulled the pedal assembly out and painted the box. I was looking at the old booster thinking if I just reinstall it, Murphy's law says it will fail the first week its back on the road. So, I love the idea of just eliminating it. Can I just use my stock master or must I buy a Moss dual line master? Curtis, what are the "other options" you mentioned for the later box?


mgb260
Jim Nichols
Sequim,WA
(1712 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: need thoughts using late model foot pedal box with booster?
Posted by: mgb260
Date: December 18, 2015 03:17PM

Gary, Most use the 1" Wilwood or 1" Corvette/Streetrod type of master with larger than stock front brakes. The stock late master was 7/8" and the 7/8" Ford Fairmont or Chevy Monza master would be a good match for the stock brakes.


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(931 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

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Re: need thoughts using late model foot pedal box with booster?
Posted by: ex-tyke
Date: December 19, 2015 09:59AM

If you opt to remove your boosted brake master in favour of a manual MC, you will certainly have to change your existing 4:1 pedal ratio to a nominal 6:1 ratio. It can be done for a late RB model (by raising/adding a hole to the brake pedal arm/pushrod) but doing so will raise the MC (about 1/2").
A 7/8" bore MC will be a good starting point for a decent combination of pedal travel and effort.
EDIT: Added photo of modification/reinforcement to MC attachment at pedal box

New Dakota brake MC.jpg



Edited 1 time(s). Last edit at 12/19/2015 10:17AM by ex-tyke.


alana
alan atkinson
10567
(232 posts)

Registered:
06/19/2008 08:06PM

Main British Car:
68 TR250 LS2

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Re: need thoughts using late model foot pedal box with booster?
Posted by: alana
Date: February 13, 2016 03:12PM

If space is the issue and you have pas consider hydro boost.


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