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Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327550 is a reply to message #327549] Thu, 28 December 2017 22:53 Go to previous messageGo to previous message
powwerjon is currently offline  powwerjon   United States
Messages: 849
Registered: March 2013
Karma:
Senior Member
Dave,
I have run many combo of brakes over the years. I did have 6 wheel disk which was 80MM on the front and a Harrison setup on the middle bogie which has a 12.5 in Ford disk with the 80MM caliper and a Cad set up with the stock Cad cal with emergency brake option. See these pictures.d I also show the comparison between the Harrison and Cad rotor.

http://www.gmcmhphotos.com/photos/g5661-disk-brake-upgrade-leigh-harrison-brakes.html

The combo I run now is still the 80MM on the front, Harrison on the middle with 80MM and standard drum brake on the rear with a 15/16 inch slave cylinder and carbon metallic shoes. I will probably go to a 7/8 inch slave on the rear the next time I do a complete service on the brakes.

The majority of the braking is provided by the middle bogie with the rear not locking up. The real difference is that I have gotten the brake pressure back up to about 1200 psi compared to about 900 psi with the p30 master. Pressure means power to stop. The more pressure that you have at the brakes is king. If you have more questions I may answer ask.

J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan


> On Dec 28, 2017, at 9:33 PM, David Shafer wrote:
>
> powwerjon,
>
> That is a nice looking setup up top. What is your choice at the wheels? ...six disks or less? If you are running disk brakes at the rear, what size
> rotors?
> Thanks,
> Dave
> --
> 1977 26 foot 403
>
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