[wanab5150]

From:
"Olthoff Racing, Inc." <bolthoff@salisbury.net>
[Add to Address Book]
To:
"Stephen Bramlitt" <sbramlitt@sbcglobal.net>, "Johnny" <dynamicmotorsports@sbcglobal.net>, "Dennis Peck" <dmpeck@aol.com>, "Barry" <barryb@hillbankusa.com>, "Bob Garndner" <rgardner@att.net>, "Tom Winkleman" <wanab5150@comcast.net>, "Tim Osgood" <tim@dynamicmotorsports.net>, "Mike Evangelo" <evang825@aol.com>
CC:
"Justin Price" <Justin@hitechauto.co.za>, "Doug Reed" <reedcobra@aol.com>
Subject:
Brake issue
Date:
Friday, April 04, 2008 5:24:40 AM
[View Source]
OK
Everybody has a opinion.
We have been using the "R" motors for 4 years. Yes they do not make a lot of vacuum. Add a vacuum canister.
We recommend the SR TW motors.
I have no issues with these.
There are only 2 people that I have found that claim to be able to lock the new rear brakes. Congratulations.
Nothing on the cars changed except the rear calipers, and now the car does not stop well.

Look at some of these numbers.
This test was done with a valve spring tester we rigged onto the brake pedal. Engine not running.
With a 150 lbs on the brake pedal we used a torque wrench on the rear axle to see when the disc will turn.

Dynalite 4 piston rear 280 ft/lbs

PBR single piston 180 ft/lbs

Wilwood single 41mm 130 ft/lbs

Wilwood single 34mm 80 ft/lbs

If this does not explain the problem, nothing will.
I do not care if you have 40 inches of vacuum, if the engine is not running it does not matter.
My 02 cents.
Dennis.