Steering, Suspension, & Brakes

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

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jjohanski
James Johanski

(61 posts)

Registered:
11/15/2017 08:57AM

Main British Car:
Re: Power Brake Boosters
Posted by: jjohanski
Date: August 16, 2019 06:32AM

Larry, What is the piston diameter of your Wilwood master cylinder? Thanks.


302GT
Larry Shimp

(241 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

authors avatar
Re: Power Brake Boosters
Posted by: 302GT
Date: August 17, 2019 09:13AM

The piston diameter is 1 inch. This is also rather commonly found in OEM master cylinders.


302GT
Larry Shimp

(241 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

authors avatar
Re: Power Brake Boosters
Posted by: 302GT
Date: September 17, 2019 09:34AM

I have now driven a few hundred miles with the new booster and I can report that it works even better than I expected. It allows the true power of the Wilwood front brake conversion to be realized. Pedal effort is low, very much like any modern car, but the brakes are easy to modulate. The highest speed stop I have tried was from 90 mph and it was effortless. This is almost a bolt in conversion with only minor fabrication needed, and probably has the biggest improvement vs time or cost of anything that can be done to an MGB. I am hoping someone who already has the stock MGB booster tries this and provides an independent assessment of the advantages...
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MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

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Re: Power Brake Boosters
Posted by: MGBV8
Date: September 17, 2019 03:52PM

Thanks for the update, Larry!

I plan to, maybe this Fall. Do you think it would provide similar results with the OEM master cylinder size?


302GT
Larry Shimp

(241 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

authors avatar
Re: Power Brake Boosters
Posted by: 302GT
Date: September 17, 2019 07:35PM

With a smaller bore master cylinder the booster will appear to be even more powerful but there would be a somewhat longer pedal travel than what I have. However, if you have stock brakes pedal travel will be stock, but I assume you have upgraded brakes...
In any case, you will need a new master cylinder since the MGB cylinder flange is too narrow.


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Power Brake Boosters
Posted by: MGBV8
Date: September 19, 2019 08:51AM

I have always had stock brakes. Still have the original front rotors on the car. :)


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Power Brake Boosters
Posted by: rficalora
Date: September 19, 2019 08:30PM

I guess you don't get them turned when you replace the pads?



MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Power Brake Boosters
Posted by: MGBV8
Date: September 20, 2019 08:55AM

I may have had them turned once in 1991. I need to measure them again. I'm sure they are at or below minimum specs by now.
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